Title :
A cylindrical hydrophone with built-in amplifier
Author :
Li-kun, Wang ; Hongliang, Du ; Gang, Wang ; Lei, Qin
Author_Institution :
Beijing Key Lab. for Sensor, Beijing Inf. Sci. & Technol. Univ., Beijing, China
Abstract :
A low frequency hydrophone with built-in amplifier was presented. It used cylinder piezoelectric ceramic as a sensing element, which had been embedded by polyurethane. When sound pressure was applied to the flexible cylinder, the piezoelectric ceramic transferred the sound pressure to electric charge. There was a preamplifier in the hydrophone. The sensitivity of the hydrophone can be controlled by adjusting a load resistance in the preamplifier, the range of adjustable sensitivity was -190 dB to -170 dB (re 1 V/¿Pa), and the frequency response was 16 Hz to 20 kHz.
Keywords :
audio-frequency amplifiers; hydrophones; piezoceramics; piezoelectric transducers; cylindrical hydrophone; cylindrical piezoelectric ceramic; electric charge; flexible cylinder; frequency 16 Hz to 20 kHz; hydrophone sensitivity; low frequency hydrophone; piezoelectric sensing element; polyurethane; preamplifier load resistance; sound pressure; Automation; Ceramics; Copper; Electrodes; Frequency; Gaskets; Preamplifiers; Rubber; Sonar equipment; Stress; Directivity; Hydrophone; Preamplifier; Sensitivity;
Conference_Titel :
Mechatronics and Automation, 2009. ICMA 2009. International Conference on
Conference_Location :
Changchun
Print_ISBN :
978-1-4244-2692-8
Electronic_ISBN :
978-1-4244-2693-5
DOI :
10.1109/ICMA.2009.5246617
