A Rod Feed Depth Measuring System of Coal Mine Gas Rig Based on Laser Doppler Effect

摘要

The invention relates to a rod feed depth measuring system of coal mine gas rig based on the laser Doppler effect, which comprises an optical path module, a frequency shift detection and processing module, a component connecting module and a coal rock fixing module. The optical path module is packaged inside a cylindrical casing outside the system. The frequency shift detection and processing module is packaged in the cylindrical casing and aligned on the surface of the rod. The component connecting module is connected to the casing of optical path module and that of the frequency shift detection and processing module. And the coal rock fixing module is connected with the casing of the optical path module, and is suspended and fixed above the outer end of the coal rock and the rod; In the process of rod exit, the scattered light generated by the laser on the moving rod is collected through the laser Doppler effect, the Doppler frequency shift of the laser is measured, and the real-time length of the rod is calculated; The length of rod exit is equivalent to the rod feed depth to avoid the interference of complex lighting, irregular operations, water flow and dust, improve the reliability and accuracy of the measurement and ensure the safety of coal mining.