At present, the verification method of hand-held laser range finder has characteristics of high labor intensity, low working efficiency and low measuring accuracy. To solve these problems, an automatic hand-held laser range finder verification system is built in this paper. This system contains a 50m marble calibration platform, a measuring trolley with visual measuring module, and a multi-degree of freedom holder of range finder. It can automatically identify the observed readings of rangefinder through optical character recognition (OCR) technology, compare with the standard ranging value obtained by the trolley, and then evaluate error of indication. Thus achieving the purpose of calibrating the rangefinder. All of the communication between PC and trolley is realized by WiFi. Experiments show this device has comprehensive functions, high level of automation, practical application value and broad market prospects.
In recent years, optical fiber sensing technology has been greatly developed and widely used in temperature, strain, harmonic vibration testing, especially acoustic detection based on optical fiber sensor, widely used in hydrophones, optical fiber microphones and other real-time detection and early warning systems. However, there is no good solution to the traceability problem of sensors based on optical fiber principle. In this paper, the traceability principle and process of traditional acoustic sensors are introduced in detail. Based on this opportunity, a traceability system which can be applied to optical fiber acoustic sensors is proposed. The system consists of a complete anechoic laboratory, an acoustic analyzer, an acoustic calibrator, a power amplifier, a piston generator, a sound source and microphone. The system has been successfully used to calibrate and trace the acoustic sensitivity and other parameters of the fiber acoustic sensor. The experimental results show that the scheme is effective. This paper has a certain significance for the development of optical fiber technology.