吸声系数检测标准吸声系数-中析研究所检测

(CMA)

(CNAS)

(ISO)

(高新技术企业)

吸声系数相关标准参考信息

GB/T 32523-2016 声学水声材料样品声压反射系数、声压透射系数和吸声系数的测量行波管法
简介：
信息：ICS： CCS：发布：2016-02-24 实施：2016-09-01

ASTM C423-2007 用混响室法测定吸声和吸声系数的标准试验方法
简介：1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2 Field Measurements - Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3). This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2007 实施：

BS EN ISO 10534-2-1999 声学.阻抗管中吸声系数和阻抗的测定.传递函数法
简介：
信息：ICS： CCS：A42 发布：1999-05-15 实施：1999-05-15

GB/T 14369-2011 声学.水声材料样品插入损失、回声降低和吸声系数的测量方法
简介：本标准规定了用脉冲管法、自由场法和压力罐近场法测量水声材料样品插入损失、回声降低和吸声系数的测量方法、测量条件、测量装置和测量不确定度。本标准适用于水声材料及构件样品插入损失、回声降低和吸声系数的测量,其中脉冲管法适用于小样品的测量,自由场法和压力罐近场法适用于不同频段的大样品测量。
信息：ICS：17.140 CCS：A59 发布：2011-12-30 实施：2012-05-01

ASTM C423-06 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2006-12-01 实施：

BS ISO 10534-2-1999 声学.阻抗管中吸声系数和阻抗的测定.第2部分:传递函数法
简介：This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. Since the impedance ratios of a sound absorptive material are related to its physical properties, such as airflow resistance, porosity, elasticity and density, measurements described in this test method are useful in basic research and product development. The test method is similar to the test method specified in ISO 10534-1 in that it uses an impedance tube with a sound source connected to one end and the test sample mounted in the tube at the other end. However, the measurement technique is different. In this test method, plane waves are generated in a tube by a noise source, and the decomposition of the interference field is achieved by the measurement of acoustic pressures at two fixed locations using wall-mounted microphones or an in-tube traversing microphone, and subsequent calculation of the complex acoustic transfer function, the normal incidence absorption and the impedance ratios of the acoustic material. The test method is intended to provide an alternative, and generally much faster, measurement technique than that of ISO 10534-1. Compared with the measurement of the sound absorption in a reverberation room according to the method specified in ISO 354, there are some characteristic differences. The reverberation room method will (under ideal conditions) determine the sound absorption coefficient for diffuse sound incidence, and the method can be used for testing of materials with pronounced structures in the lateral and normal directions. However, the reverberation room method requires test specimens which are rather large, so it is not convenient for research and development work, where only small samples of the absorber are available. The impedance tube method is limited to parametric studies at normal incidence but requires samples of the test object which are of the same size as the cross-section of the impedance tube. For materials that are locally reacting, diffuse incidence sound absorption coefficients can be estimated from measurement results obtained by the impedance tube method. For transformation of the test results from the impedance tube method (normal incidence) to diffuse sound incidence, see annex F.
信息：ICS： CCS：A42 发布：1999-05-15 实施：1999-05-15

GB/T 18696.1-2004 声学阻抗管中吸声系数和声阻抗的测量第1部分;驻波比法
简介：1.1 GB/T 18696的本部分规定了测定法向入射时吸声材料和结构的吸声系数、反射因数和表面声阻抗率或表面声导纳率的方法，这些数据是根据阻抗管中法向入射条件下入射正弦平面波和从试件反射回来的平面波叠加后产生的驻波图测定的。由于只需少量的吸声材料作试件，所以它对于吸声材料的参数研究和设计特别适合。 1.2 本部分的方法，与混响室测量吸声系数的方法(见ISO 354)比较，有一些重要差别。阻抗管法既可用来测定吸声系数，也可用来测定声阻抗率或声导纳率。本方法规定声波法向入射到试件表面。混响室法(在理想条件下)测定无规入射吸声系数。阻抗管法的根据是存在一个入射平面声波，这种条件下它能给出准确的测量值(测量误差和安装误差除外)。混响室中吸声系数的测定，建立在对声场和试件大小的一些简化和近似的假设的基础之上，因此，有时会得到大于1的吸声系数。阻抗管法要求试件与阻抗管的横截面一样大。混响室法要求相当大的试件，同时混响室法还可用于在横向和/或表面的垂直方向有明显不均匀结构的试件。在阻抗管中对这种不均匀试件所作的测量必须小心地解释(见9.1条)。把阻抗管法(法向入射)的测试结果换算为无规入射条件的计算方法参见附录D。 1.3 因为现在实验室都备有计算机，所以本部分采用数值计算方法，而不采用图表查找法。本部分公式中的某些量是复数。三角函数的宗量用弧度表示
信息：ICS： CCS：A59 发布：2004-05-13 实施：2004-12-01

ASTM C423-2006 用混响室法测定吸声及吸声系数的标准试验方法
简介：1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2 Field Measurements8212;Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3). 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2006 实施：

ASTM C423-1999a 用混响室法测定吸声及吸声系数的标准试验方法
简介：1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2Field Measurements8212;Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3).1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：1999 实施：

GB/T 18696.2-2002 声学阻抗管中吸声系数和声阻抗的测量第2部分;传递函数法
简介：传递函数法测定法向入射条件下吸声材料的吸声系数，涉及阻抗管的使用、两个传声器的位置和数字频率分析系统。本方法也能用来测定吸声材料的表面声阻抗率或表面声导纳率。由于吸声材料的声阻抗率与它的物理特性（诸如流阻、孔隙率、弹性模量和密度）有关，所以本标准规定的测量方法在有关的基础研究和产品开发方面也有用处。本方法与ISO 10534-1规定的方法相似，都要用一支一端接声源，另一端安装试件的阻抗管，但是测量方法完全不同。在本方法中，管中的平面波由噪声源产生，干涉场的分析则用两只安装在管壁一定位置的传声器（或一只可在管中移动的传声器）作两点声压的测量来实现，然后完成复传递函数、吸声材料法向入射吸声系数和声阻抗率的计算。本方法目的是提供另一种较之驻波比法更为快捷的测量方法。将本方法与ISO 354规定的混响室吸声测量方法比较可以看出二者有很大差别。（理想条件下）混响室法测定扩散入射吸声系数，能用于测试横向和法向有明显不同结构的材料。然而混响室法要求较大的测试样品，这对只能提供小样品吸声材料的研究和开发工作有不便之处。阻抗管法仅限于法向入射参数的研究，要求测试样品与阻抗管的横截面一样大。对于局部反应的材料，扩散入射吸声系数能从阻抗管法得来的测量结果估算。阻抗管法（法向入射）的测试数据换算到扩散入射的相应结果的算法见附录F
信息：ICS：17.140.01 CCS：A59 发布：2002-03-26 实施：2002-12-01

NF S31-079-1-2003 声学.阻抗管中吸声系数和阻抗测定.第1部分:驻波比率法
简介：
信息：ICS： CCS：Z32 发布：2003-01-01 实施：2003-01-05

ISO 10534-2:1998 声学——阻抗管Spart 2中吸声系数和阻抗的测定:传递函数法
简介：
信息：ICS：17.140.01 CCS：发布：1998-11-19 实施：

GBJ 88-1985 驻波管法吸声系数与声阻抗率测量规范
简介：本规范适用于吸收空气声的吸声材料和吸声构件。采用驻波管测量法向入射时的吸声系数和法向声阻抗率。
信息：ICS： CCS：P31 发布：1986-07-01 实施：1986-07-01

NF S31-079-2-2003 声学.阻抗管中吸声系数和阻抗测定.第2部分:传递函数法
简介：
信息：ICS：91.120.20 CCS：Z32 发布：2003-01-01 实施：2003-01-05

ISO 10534-2-1998 声学阻抗管中吸声系数和比阻抗率的测量第2部分:传递函数法
简介：This test method covers the use of an impedance tube, two microphone locations and a digital frequency analysis system for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. Since the impedance ratios of a sound absorptive material are related to its physical properties, such as airflow resistance, porosity, elasticity and density, measurements described in this test method are useful in basic research and product development.The test method is similar to the test method specified in ISO 10534-1 in that it uses an impedance tube with a sound source connected to one end and the test sample mounted in the tube at the other end. However, the measurement technique is different. In this test method, plane waves are generated in a tube by a noise source, and the decomposition of the interference field is achieved by the measurement of acoustic pressures at two fixed locations using wall-mounted microphones or an in-tube traversing microphone, and subsequent calculation of the complex acoustic transfer function, the normal incidence absorption and the impedance ratios of the acoustic material. The test method is intended to provide an alternative, and generally much faster, measurement technique than that of ISO 10534-1.Compared with the measurement of the sound absorption in a reverberation room according to the method specified in ISO 354, there are some characteristic differences. The reverberation room method will (under ideal conditions) determine the sound absorption coefficient for diffuse sound incidence, and the method can be used for testing of materials with pronounced structures in the lateral and normal directions. However, the reverberation room method requires test specimens which are rather large, so it is not convenient for research and development work, where only small samples of the absorber are available. The impedance tube method is limited to parametric studies at normal incidence but requires samples of the test object which are of the same size as the cross-section of the impedance tube. For materials that are locally reacting, diffuse incidence sound absorption coefficients can be estimated from measurement results obtained by the impedance tube method. For transformation of the test results from the impedance tube method (normal incidence) to diffuse sound incidence, see annex F.
信息：ICS： CCS：A42 发布：1998-11 实施：

GBJ 47-1983 混响室法吸声系数测量规范(试行)
简介：本规范适用于混响室内测量吸声材料的吸声系数和一单个物体的吸声量。
信息：ICS： CCS：P31 发布：1983-06-01 实施：1983-06-01

ASTM C423-02ae1 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2002-12-10 实施：

ISO 10534-1:1996 声学——阻抗管中吸声系数和阻抗的测定第1部分:驻波比法
简介：
信息：ICS：17.140.01 CCS：发布：1996-12-12 实施：

ASTM C423-22 混响室法测定吸声和吸声系数的标准试验方法
简介：
信息：ICS：91.120.20 CCS：发布：2022-02-01 实施：

ASTM C423-02a 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2002-12-10 实施：

ISO 10534-1-1996 声学阻抗管中吸声系数和比阻抗率的测量第1部分:驻波比法
简介：Specifies a method for the determination of the sound absorption coefficient, reflection factor, surface impedance or admittance of materials and objects. The values are determined by evaluation of the standing wave pattern of a plane wave in a tube, which is generated by the superposition of an incident sinusiodal plane wave with the plane wave reflected from the test object.
信息：ICS：17.140.01 CCS：A42 发布：1996-12 实施：

ASTM C423-17 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2017-01-15 实施：

KS F 2814-2-2002(2022) 阻抗管吸声系数和阻抗的声学测定第2部分:传递函数法
简介：
信息：ICS：17.140.01 CCS：发布：2002-06-07 实施：

HB 7126-1994 航空材料和构件的混响室法吸声系数测量
简介：本标准规定了在混响室中测量航空材料、机舱壁板或装饰板的吸声系数，以及测量座椅、人、空间吸声体的吸声量的方法。　　本标准适用于在混响室中对材料、构件、空间吸声体的吸声系数声量测量，但不适用于测量弱阻尼共振器的吸声特性。
信息：ICS： CCS：Z32 发布：1995-05-04 实施：1995-06-01

KS F 2814-1-2016(2021) 阻抗管吸声系数和阻抗的测定第1部分:驻波比法
简介：
信息：ICS：17.140.01 CCS：发布：2016-12-28 实施：

KS F 2814-2-2002(2017) 声学阻抗管吸声系数和阻抗的测定第2部分:传递函数法
简介：
信息：ICS：17.140.01 CCS：发布：2002-06-07 实施：

ONORM S 5104-1986 建筑声学测试．混响室吸声系数的测量
简介：
信息：ICS： CCS：发布：1986-10-1 实施：

ASTM C423-09a 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2009-10-15 实施：

ASTM C423-02 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2002-04-10 实施：

JUS U.J6.224-1983 管内吸声系数的测定
简介：
信息：ICS： CCS：发布：1983-01-01 实施：

ASTM C423-09 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2009-10-01 实施：

BS EN ISO 10534-1-2001 声学.阻抗管中吸声系数和阻抗的测定.驻波比法
简介：1 This part of ISO 10534 specifies a method for the determination of the sound absorption coefficient, reflection factor and surface impedance or surface admittance of materials and objects. The values are determined for normal sound incidence by evaluation of the standing wave pattern of a plane wave in a tube, which is generated by the superposition of an incident sinusoidal plane wave with the plane wave reflected from the test object.This method can be used for the determination of the sound absorption coefficient of sound absorbers for normal sound incidence. It can further be used for the determination of the acoustical surface impedance or surface admittance of sound-absorbing materials. It is well suited for parameter studies and for the design of sound absorbers, because only small samples of the absorber material are needed.2 There are some characteristic differences be-tween this method and the measurement of sound absorption in a reverberation room (see ISO 354).The impedance tube method can be used for the de-termination of the reflection factor and also the im-pedance or admittance. The sound is incident normally on the object surface. The reverberation room method will (under idealized conditions) determine the sound absorption coefficient for random sound incidence.The impedance tube method relies on the existence of a plane incident sound wave and gives exact values under this condition (measuring and mounting errors excluded). The evaluation of the sound absorption co-efficient in a reverberation room is based on a number of simplifying and approximate assumptions concern-ing the sound field and the size of the absorber.Sound absorption coefficients exceeding the value 1 are therefore sometimes obtained.The impedance tube method requires samples of the test object which are the size of the cross-sectional area of the impedance tube. The reverberation room method requires test objects which are rather large and can also be applied to test objects with pro-nounced structures in the lateral and/or normal direc-tions. Measurements with such objects in the impedance tube must be interpreted with care (see 9.1).For the computational transformation of the test re-sults from the impedance tube method (normal inci-dence) to the situation of diffuse sound incidence, see annex D.3 This part of ISO 10534 gives preference to nu-merical methods of evaluation instead of graphical methods, because computers which can perform these computations are assumed to be available. Some of the quantities in the formulae are complex. The arguments of trigonometric functions are in radians.
信息：ICS： CCS：A42 发布：2001-11-02 实施：2001-11-02

简介： 信息：

ASTM C423-2009a 用混响室法测定吸声及吸声系数的标准试验方法
简介：Measurement of the sound absorption of a room is part of the procedure for other acoustical measurements, such as determining the sound power level of a noise source or the sound transmission loss of a partition. It is also used in certain calculations such as predicting the sound pressure level in a room when the sound power level of a noise source in the room is known. The sound absorption coefficient of a surface is a property of the material composing the surface. It is ideally defined as the fraction of the randomly incident sound power absorbed by the surface, but in this test method it is operationally defined in 4.2. The relationship between the theoretically defined and the operationally measured coefficients is under continuing study. Diffraction effects usually cause the apparent area of a specimen to be greater than its geometrical area, thereby increasing the coefficients measured according to this test method. When the test specimen is highly absorptive, these values may exceed unity. The coefficients measured by this test method should be used with caution because not only are the areas encountered in practical usage usually larger than the test specimen, but also the sound field is rarely diffuse. In the laboratory, measurements must be made under reproducible conditions, but in practical usage the conditions that determine the effective absorption are often unpredictable. Regardless of the differences and the necessity for judgment, coefficients measured by this test method have been used successfully by architects and consultants in the acoustical design of architectural spaces. Field Measurements8212;When sound absorption measurements are made in a building in which the size and shape of the room are not under the operator''s control, the approximation to a diffuse sound field is not likely to be very close. This matter should be considered when assessing the accuracy of measurements made under field conditions. (See Appendix X2 for a procedure that can be used in the field with less sophisticated instrumentation.)1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described. 1.2 Field Measurements8212;Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2. 1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2009 实施：

DIN EN ISO 10534-1-2001 声学.阻抗管吸声系数和阻抗测定.第1部分:驻波比法
简介：The document specifies a method for the determination of the sound absorption coefficient, reflection factor and surface impedance or surface admittance of materials and objects.,,
信息：ICS：17.140.01 CCS：A42 发布：2001-10 实施：

简介： 信息：

ASTM C423-08a 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2008-10-01 实施：

DIN EN ISO 10534-2-2001 声学.阻抗管吸声系数和阻抗测定.第2部分:传递函数法
简介：
信息：ICS： CCS：A42 发布：2001-10 实施：

简介： 信息：

ASTM C423-08 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2008-03-01 实施：

ASTM C423-01 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：17.140.01 CCS：发布：2001-07-10 实施：

简介： 信息：

DIN EN ISO 10534-2 Berichtigung 1-2007 声学.阻抗管中吸声系数和阻抗的测定.第2部分:传递函数法
简介：
信息：ICS：17.140.01 CCS：N65 发布：2007-11 实施：

ASTM C423-00 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：17.140.01 CCS：发布：2001-07-10 实施：

简介： 信息：

ASTM C423-07a 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2007-06-01 实施：

ASTM C423-99a 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2001-07-10 实施：

简介： 信息：

JIS A1405-2-2007 声学.阻抗管中吸声系数和阻抗的测定.第2部分:传递函数法
简介：この規格は，吸音材の垂直入射吸音率の測定に必要な,音響管，二つのマイクロホン位置及びデジタル周波数分析システムの使用方法について規定する。この規格は,吸音材表面の比音響インピーダンス又は比音響アドミタンスの測定にも適用できる。吸音材料の比音響インピーダンスは，その物理的性質(例えば，流れ抵抗,空げき率,弾性及びかさ密度)と関係があるので，この規格による測定は基礎研究及び製品開発に適している。
信息：ICS：17.140.01 CCS：Z32 发布：2007-04-20 实施：

EN ISO 10534-2-2001 声学.阻抗管中吸声系数和比阻抗率的测量.第2部分:传递函数法
简介：
信息：ICS：91.120.20 CCS：发布：2001-06-01 实施：

简介： 信息：

JIS A1405-1-2007 声学.阻抗管中吸声系数和阻抗的测定.第1部分:驻波比法
简介：この規格は，材料又は物体の吸音率，音圧反射率及び表面の垂直入射比音響インピーダンス又は表面の垂直入射比音響アドミタンスの算出方法について規定する。この値は，入射正弦平面波と試験体から反射する平面波との合成によって生じる管内平面波の定在波パターンの測定によって，垂直入射斉に対して算出される。
信息：ICS：17.140.01 CCS：Z32 发布：2007-04-20 实施：

EN ISO 10534-1-2001 声学.阻抗管中吸声系数和比阻抗率的测量.第1部分:使用驻波比的方法
简介：The document specifies a method forThe determination of the sound absorption coefficient, reflection factor and surface impedance or surface admittance of materials and objects.,,
信息：ICS：91.120.20 CCS：发布：2001-06-01 实施：

简介： 信息：

ASTM C423-07 通过混响室方法吸声和吸声系数的标准测试方法
简介：
信息：ICS：91.120.20 CCS：发布：2007-01-01 实施：

ASTM C423-2001 用混响室法测定吸声及吸声系数的标准试验方法
简介：1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2Field Measurements8212;Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3).1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2001 实施：

简介： 信息：

ASTM C423-2007a 用混响室法测定吸声和吸声系数的标准试验方法
简介：Measurement of the sound absorption of a room is part of the procedure for other acoustical measurements, such as determining the sound power level of a noise source or the sound transmission loss of a partition. It is also used in certain calculations such as predicting the sound pressure level in a room when the sound power level of a noise source in the room is known. The sound absorption coefficient of a surface is a property of the material composing the surface. It is ideally defined as the fraction of the randomly incident sound power absorbed by the surface, but in this test method it is operationally defined in 4.2. The relationship between the theoretically defined and the operationally measured coefficients is under continuing study. Diffraction effects5 usually cause the apparent area of a specimen to be greater than its geometrical area, thereby increasing the coefficients measured according to this test method. When the test specimen is highly absorptive, these values may exceed unity. The coefficients measured by this test method should be used with caution because not only are the areas encountered in practical usage usually larger than the test specimen, but also the sound field is rarely diffuse. In the laboratory, measurements must be made under reproducible conditions, but in practical usage the conditions that determine the effective absorption are often unpredictable. Regardless of the differences and the necessity for judgment, coefficients measured by this test method have been used successfully by architects and consultants in the acoustical design of architectural spaces. Field Measurements8212;When sound absorption measurements are made in a building in which the size and shape of the room are not under the operatorrsquo;control, the approximation to a diffuse sound field is not likely to be very close. This matter should be considered when assessing the accuracy of measurements made under field conditions. (See Appendix X2 for a procedure that can be used in the field with less sophisticated instrumentation.)1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2 Field Measurements - Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in .1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see ), and reverberation room qualification (see Annex A3). This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2007 实施：

ASTM C423-2000 用混响室法测定吸声及吸声系数的标准试验方法
简介：1.1 This test method covers the measurement of sound absorption in a reverberation room by measuring decay rate. Procedures for measuring the absorption of a room, the absorption of an object, such as an office screen, and the sound absorption coefficients of a specimen of sound absorptive material, such as acoustical ceiling tile, are described.1.2Field Measurements8212;Although this test method primarily covers laboratory measurements, the test method described in 4.1 can be used for making field measurements of the absorption of rooms (see also 5.5). A non-standard method to measure the absorption of rooms in the field is described in Appendix X2.1.3 This test method includes information on laboratory accreditation (see Annex A1), asymmetrical screens (see Annex A2), and reverberation room qualification (see Annex A3).1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
信息：ICS：91.120.20 (Acoustics in buildings. Sound insulatio CCS：P31 发布：2000 实施：

简介： 信息：