Coombs S, Fay R R, Janssen J
Parmly Hearing Institute, Loyola University of Chicago, Illinois 60626.
J Acoust Soc Am. 1989 May;85(5):2185-93. doi: 10.1121/1.397867.
A hot-film anemometer system has been calibrated and evaluated for the measurement of sinusoidal water motions used in stimulating the mechanosensory lateral line system of a teleost fish. The response of the anemometer system to water motions created by a vibrating sphere was measured over a wide range of frequencies, intensities, and distances from the sphere. The amplitude response of the system to signals along the axis of sphere vibration was found to be linear over a 50-dB range for frequencies from 10-200 Hz, with the lowest end of the dynamic range (between 10(-8) and 10(-9) m) corresponding to physiological measures of best sensitivity in the lateral line system of the mottled sculpin, Cottus bairdi. The measured attenuation of the signal with distance was also linear over this frequency range out to distances of six times the radius ( = 3 mm) of the sphere and followed the predicted falloff rate for a dipolar source. The linear response of the anemometer system over a wide dynamic range encompassing the detection range of the lateral line system, and the match between predicted and measured motions at varying distances from a dipolar source, indicates that hot-film anemometry is a useful technique for measuring low-level, low-frequency signals likely to stimulate the lateral line system and other hydrodynamic detectors.
已对一种热膜风速仪系统进行了校准和评估，用于测量刺激硬骨鱼机械感觉侧线系统时所使用的正弦水运动。在很宽的频率、强度范围以及距球体不同距离处，测量了风速仪系统对由振动球体产生的水运动的响应。发现该系统对沿球体振动轴信号的幅度响应在10 - 200 Hz频率范围内的50分贝范围内呈线性，动态范围的最低端（介于10(-8)和10(-9)米之间）对应于斑驳杜父鱼（Cottus bairdi）侧线系统中最佳灵敏度的生理测量值。在该频率范围内，信号随距离的测量衰减在达到球体半径（ = 3毫米）的六倍距离之前也呈线性，并且遵循偶极源的预测衰减率。风速仪系统在涵盖侧线系统检测范围的宽动态范围内的线性响应，以及在距偶极源不同距离处预测运动与测量运动之间的匹配，表明热膜风速测量法是一种用于测量可能刺激侧线系统和其他流体动力探测器的低水平、低频信号的有用技术。
