Research on digital grating vibration sensor

Digital grating sensor of vibration measurement is a pattern of geophone, which picks up seismic signals with grating vibrator. Along with the request of higher precision method to identify more complex geological targets, higher precision and accurate information of oil reservoirs underground must be provided through geophysical technologies for reservoirs prospecting and developing. By digital grating sensor of vibration measurement, mechanical vibrating signal of the seismic wave can be transformed into light modulating signal - moire fringes, and then converts by photoelectric element to digital electrical signal. The sensor samples the signal by counting the numbers of the moire fringes, which may prevent quality of the output data from being influenced by electric circuits, and the packaging technology is also simplified. The working principle, theoretical arithmetic, configuration design, test method and acquired data by digital grating sensor are presented in the paper.