. Basic methods for the calibration of sonar equipment. HYDROPHONE. HYDROPHONE Fi(a'RK 37. rian \icw of l\pical test set-ups for studying battle characteristics: (.\) reference rinis, (B) soinid trans- mission through baffle. (C) threshold signal without baffles. (1)) soinid reflection bv balHe. made for the observation and control of the driving power. A standard hydrophone having a substantially uniform frequency response is selected for the acous- tic pressure measurement. In the selection, the maxi- mum instantaneous pressure must be considered in f)rder to avoid overloading of the preampl
. Basic methods for the calibration of sonar equipment. HYDROPHONE. HYDROPHONE Fi(a'RK 37. rian \icw of l\pical test set-ups for studying battle characteristics: (.\) reference rinis, (B) soinid trans- mission through baffle. (C) threshold signal without baffles. (1)) soinid reflection bv balHe. made for the observation and control of the driving power. A standard hydrophone having a substantially uniform frequency response is selected for the acous- tic pressure measurement. In the selection, the maxi- mum instantaneous pressure must be considered in f)rder to avoid overloading of the preamplifier. Observation of the crest factor should be made first with the arrangement shown in Figure 38, where the rms of the signal is obtained on the 30A set and the jjeak amplitude on the cathode-ray oscilloscope. The complex wave signal is then replaced by a sinusoidal one from an oscillator set at a level which gives the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Office of Scientific Research and Development. National Defense Research Committee. Washington, D. C.
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