Calibration of Anechoic Chamber Using Inverse Square Law and Its Data Processing
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摘要: 消声室和半消声室为各种声学测试提供了必要的声学环境,其声学性能参数主要包括自由声场的频率范围、空间范围和背景噪声。消声室和半消声室通过在墙面安装吸声材料吸收入射到墙上的声波,从而产生自由声场环境,本文主要介绍了通过平方反比规律校准消声室和半消声室自由声场的原理、方法和消声室自由声场数据处理过程,为提高消声室自由声场的测量精度提供经验借鉴。Abstract: Anechoic chamber and hemi-anechoic chamber provide the necessary acoustic environment for various acoustic tests, mainly including frequency range, spatial range, and background noise of the free sound field. The anechoic chamber and hemi-anechoic chamber absorb the sound wave incident on the wall and reduce the reflected sound by laying sound-absorbing materials in the chamber, thereby generating a free sound field environment. This paper introduces the principle and method of calibrating the free sound field of anechoic chamber and hemi-anechoic chamber by inverse square law and the data processing of the free sound field of the anechoic chamber to provide experience reference for improving the measurement accuracy of the free sound field of anechoic chamber.
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Key words:
- anechoic chamber /
- inverse square law /
- technical indicator /
- calibration method /
- data processing
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表 1 消声室内声压级与理论值的最大允许偏差
Table 1. The maximum allowable deviation of the sound pressure level in the anechoic chamber from the theoretical value
1/3倍频带中心频率/Hz 最大允许偏差/dB ≤630 ±1.5 800~5000 ±1.0 ≥6300 ±1.5 表 2 半消声室内声压级与理论值的最大允许偏差
Table 2. The maximum allowable deviation of the sound pressure level in the hemi-anechoic chamber from the theoretical value
1/3倍频带中心频率/Hz 最大允许偏差/dB ≤630 ±2.5 800~5000 ±2.0 ≥6300 ±3.0 表 3 消声室某测量路径上的声压级测量值
Table 3. Sound pressure level measurement on a measurement path in an anechoic chamber
/dB 频率测点 63 Hz 630 Hz 800 Hz 1000 Hz 5000 Hz 6300 Hz 0 64.9 78.7 79.3 82.7 89.5 82.7 1 63.2 76.9 77.7 81.1 87.9 81.2 2 61.7 75.7 76.2 79.9 86.5 80.0 3 60.3 74.6 74.7 78.6 85.3 78.8 4 59.1 73.8 73.5 77.4 84.2 77.8 5 58.0 72.9 72.7 76.7 83.2 77.0 6 56.9 71.9 71.9 75.8 82.4 76.2 7 55.9 71.1 71.3 74.9 81.6 75.4 8 54.9 70.6 70.6 74.0 80.9 74.7 9 54.0 69.9 69.8 73.3 80.2 74.1 10 53.0 69.1 69.3 72.6 79.6 73.5 11 52.0 68.5 69.0 72.1 79.0 72.9 12 50.9 68.1 68.4 71.6 78.4 72.2 13 49.9 67.9 67.4 71.0 77.9 71.8 14 48.9 67.6 66.9 70.1 77.5 71.3 15 47.9 66.9 67.0 69.8 77.0 70.8 16 46.8 66.4 66.9 69.9 76.5 70.4 17 45.7 65.9 66.5 69.2 76.1 70.0 19 43.3 64.8 65.7 68.0 75.3 69.2 20 41.9 64.8 65.2 68.1 75.1 68.8 21 40.6 64.7 64.8 68.1 74.8 68.5 22 39.3 64.1 64.6 67.9 74.3 68.2 23 37.9 63.4 64.5 67.5 73.9 67.9 24 36.6 63.0 64.3 67.1 73.5 67.6 25 35.6 63.1 63.7 67.1 73.1 67.3 -
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