Dowson S P, McNeill H A
Division of Radiation Science and Acoustics, Teddington, Middlesex.
Br J Audiol. 1992 Oct;26(5):275-81. doi: 10.3109/03005369209076648.
Measurements of mechanical coupler performance have been made over the temperature range 13 degrees C to 33 degrees C to investigate the change of force sensitivity level and mechanical impedance level with temperature for frequencies in the range 125 Hz to 5000 Hz. In addition, the temperature dependence of the voltage output of the mechanical coupler system has been measured for a coupler driven by a Radioear type B-71 bone vibrator, to investigate the net effect of these changes on an audiometer calibration. Very clear dependence on temperature has been found for all three parameters at some frequencies. In particular, coefficients approaching 0.6 dB/degrees C have been found for the rate of change of force sensitivity level at higher frequencies, and when driven by a bone vibrator coefficients around 0.5 dB/degrees C have been measured for the voltage output, again at the higher frequencies. This strong dependence of the performance of the mechanical coupler on temperature has implications for all those working in audiometric calibration, and especially for those involved in providing calibrations of audiometers in situ, where the mechanical coupler is transported from site to site and may well be exposed to extremes of temperature during transportation.
在13摄氏度至33摄氏度的温度范围内对机械耦合器性能进行了测量，以研究在125赫兹至5000赫兹频率范围内力灵敏度水平和机械阻抗水平随温度的变化。此外，对于由Radioear B - 71型骨振动器驱动的耦合器，测量了机械耦合器系统电压输出的温度依赖性，以研究这些变化对听力计校准的净影响。在某些频率下，已发现所有这三个参数都非常明显地依赖于温度。特别是，在较高频率下，力灵敏度水平的变化率系数接近0.6分贝/摄氏度，当由骨振动器驱动时，在较高频率下，电压输出的系数约为0.5分贝/摄氏度。机械耦合器性能对温度的这种强烈依赖性对所有从事听力计校准工作的人员都有影响，尤其对于那些参与现场听力计校准的人员，在现场校准中，机械耦合器要从一个地点运输到另一个地点，并且在运输过程中很可能会暴露在极端温度下。
