Abstract
An optical sensor such as a laser range finder (LRF) or laser displacement meter (LDM) uses reflected and returned laser beam from a target. The optical sensor has been mainly used to measure the distance between a launch position and the target. However, optical sensor based LRF and LDM have numerous and various errors such as statistical errors, drift errors, cyclic errors, alignment errors and slope errors. Among these errors, an alignment error that contains measurement error for the strength of radiation of returned laser beam from the target is the most serious error in industrial optical sensors. It is caused by the dependence of the measurement offset upon the strength of radiation of returned beam incident upon the focusing lens from the target. In this paper, in order to solve these problems, we propose a novel method for the measurement of the output of direct current (DC) voltage that is proportional to the strength of radiation of returned laser beam in the received avalanche photo diode (APD) circuit. We implemented a measuring circuit that is able to provide an exact measurement of reflected laser beam. By using the proposed method, we can measure the intensity or strength of radiation of laser beam in real time and with a high degree of precision.
Highlights
An optical sensor such as a laser range finder (LRF) remotely measures distances by using the laser wavelength that is reflected and returned from a target
An optical sensor techniques based on laser displacement meter (LDM) can be divided into the following types: time-of-flight [1,2,3,4], triangulation [5,6], frequency modulation continuous-wave (FMCW) phase measurement [7,8], phase shift [9,10,11,12,13,14], interferometry method [15,16,17,18,19]
In order to solve these problems, we propose a novel method for the measurement of the output of direct current (DC) voltage that is proportional to the strength of radiation of returned laser beam in the received APD circuit
Summary
An optical sensor such as a laser range finder (LRF) remotely measures distances by using the laser wavelength that is reflected and returned from a target. Helicopters, tanks, and armored vehicles of military and defense forces have been equipped with them because the optical sensor comparatively provides exact measured distance to the target. An optical sensor techniques based on laser displacement meter (LDM) can be divided into the following types: time-of-flight [1,2,3,4], triangulation [5,6], frequency modulation continuous-wave (FMCW) phase measurement [7,8], phase shift [9,10,11,12,13,14], interferometry method [15,16,17,18,19]. The optical sensor has a technical difficulty for making it into an industrial product because industrial products require more precise technique compared to products used in military Interferometry method is well-known for providing the highest resolution [15,16,17,18,19].
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