Title :
Temperature dependence of PA signals detected by a piezoelectric transducer
Author :
Koda, Toshio ; Ogiso, Hisato ; Nakano, Sizuka ; Nagata, Yoshihiko ; Yamanaka, Kazushi
Author_Institution :
Mech. Eng. Lab., Ibaraki, Japan
Abstract :
The amplitude and phase of photoacoustic (PA) signals from a thin plate, pure water, water including ultrafine particles, a 15% solution of Na2HPO4 in water, and a turbid solution were observed by a piezo-PA system as a function of the modulation frequency and temperature. In the case of a thin plate, the PA signals exhibit two kinds of temperature dependences according to the modulation frequency. In the case of the liquid samples, the ultrafine particles are found to enhance the change of PA signals due to the phase transition
Keywords :
photoacoustic effect; piezoelectric transducers; signal detection; ultrasonic measurement; ultrasonic transducers; Na2HPO4 aqueous solution; modulation frequency; phase transition; photoacoustic signal amplitude; photoacoustic signal detection; photoacoustic signal phase; piezoelectric transducer; pure water; temperature dependences; thin plate; turbid solution; ultrafine particles; Acoustic signal detection; Frequency modulation; Laboratories; Noise measurement; Optical materials; Optical modulation; Phase change materials; Piezoelectric transducers; Signal detection; Temperature dependence;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171444
