Photoelectric tachometer verification method based on wavelength-adjustable LED pulse light source

Abstract

The invention provides a photoelectric tachometer verification method based on an adjustable wavelength LED pulse light source. When a photoelectric tachometer is calibrated, optical pulse signals corresponding to the rotating speed of each calibration point are directly provided, and the optical pulse signals are directly converted into rotating speed values after being received by the calibrated photoelectric tachometer. The method comprises the following steps: (1) checking general technical requirements; (2) selecting a verification point; (3) performing test running; selecting an LED pulse light source with matched wavelength as a standard rotating speed source, and preheating; and (4) performing indicating value verification. When the photoelectric tachometer is calibrated, optical pulse signals corresponding to the rotating speed of each calibration point are directly provided, and the optical pulse signals are directly converted into rotating speed values after being received by the calibrated photoelectric tachometer. The detected tachometer is directly detected by the standard pulse optical signal; and noise vibration is avoided, and carrying is convenient. The method is suitable for being applied as a photoelectric tachometer verification method based on the adjustable wavelength LED pulse light source .

Description

technical field [0001] The invention relates to the verification of a photoelectric tachometer in the measurement field, in particular to a verification method for a photoelectric tachometer based on an adjustable wavelength LED pulse light source. Background technique [0002] The photoelectric tachometer is a non-contact tachometer with digital display, which is used to measure the rotational speed of various rotating objects. Its verification work is mainly carried out in accordance with "JJG105-2019 Tachometer Verification Regulations". The working principle of the verification is that the standard speed source outputs the standard speed value as the true value, and it is measured by the tested photoelectric tachometer, and the value displayed by the tested photoelectric tachometer is taken as the measured value. The error value can be obtained by subtracting the true value from the measured value. [0003] At present, the standard speed source is generated by the speed...

AI Technical Summary

Problems solved by technology

[0005] 1. The standard speed signal needs to be converted into an electrical signal through motor output, gearbox speed change, reflective sheet reflection, photoelectric conversion, etc., before it can be received and measured by the tested photoelectric tachometer. The process is complicated;

[0006] 2. The speed standard device is a mechanical component. Because the motor and the base are made of metal, the mass is large, and it is not easy to move and on-site verification;

[0007] 3. Due to the existence of the motor and gearbox, the system is noisy and vibrating when it is working;

[0008] 4. At present, the measurement upper limit of the photoelectric tachometer is mostly 99999 rpm, and the speed standard device needs to work at the upper limit. Due to the high-speed rotation of the tachometer, there are certain safety hazards;

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