Application of laser heterodyne interferometer in solid rocket motor vibration

The vibration frequency and intensity of the solid rocket motor in operation were studied by laser heterodyne interferometer. For experiment vibration system of engine model, a laser heterodyne interferometer system in laboratory condition was established. Experiments show that the measurement bandwidth of laser heterodynes interferometer vibration system is 7.8 Hz, and measurement standard deviation is less than 5.6×10-8. Glass vibration experimental results coincide with the local oscillator frequency, and signal strength exhibits a linear relationship with the amplitude of the system. Laser heterodyne interferometry is applicable in engine vibration measurement process.