A Laser-based Deflection Or Displacement Measurement System Of A Remote Object

Displacement can be measured by traditional mechanical methods and optical means. Optical displacement measuring systems have the advantages of nor-contact, high resolution, fast response, and more importantly being remote. We describe in this paper a laser-based displacement measuring system, which can detect displacement or deflection of an object in a long distance. In order to achieve a remote measurement, the laser beam is first collimated, and directed to the detector array, which is attached to the object to be measured. The relative movement between the laser source and the detector will provide a measure to the displacement or deflection of the object. The system consists of a laser source and a linear detector system. And the linear detector system include two parts, one part is measuring transmitter which consists a detector, a MCU system and a wireless transmission module, the other one is data receiving system which consists a wireless transmission module, a data processing system, a module used to display and control. The software consists of linear CCD data collection, memorizer management, wireless digital communication, measurement data processing and data display.The most important feature of the system is the using of long distance wireless digital signal and data transmission which increases the stability and practicability of the system. MCU and LED have also been investigated, which makes the system more convenient and small. The features of the current displacement measuring system include high resolution and accuracy while still keeping a relatively simple structure and a low cost. Due to its features, perspective of its appreciation should be wide.Experimental results are presented and the structure, working principle, hardware and software design are also introduced in detail. The measurement effect is proved by experiment. The measuring of the system is 29Hz. The error of the system is between -0.07mm to 0.07mm and the standard error is less than 0.05mm. Simultaneity, the method in order to improve the measuring frequency and precision of the system is also introduced.