☆Two-way output of signal source: continuously adjustable frequency:
(1)To observe sound field grating; resonant frequency of sensor is about 800KHz
(2)To observe ultrasonic grating: resonant frequency of sensor is about 10MHx
☆Ultrasonic power: 50W.
☆Laser power:5mW, service life≥7000h; laser wavelength: 650nm;
☆Length of optical bench: 1000mm;  focal length of beam expanders: f=20mm;