Optical fringe automatic counting device and counting method based on optical fiber

Abstract

The invention discloses an optical fiber-based automatic optical stripe counting device and a counting method, including an optical fiber probe packaged with a standard SMA connector, the optical fiber probe is connected with an optical fiber connector through an optical fiber, the optical fiber connector is connected with a photoelectric detector, and the photoelectric detector collects The light and dark signals are converted into electrical signals, and the microprocessor collects and judges the state of light and dark stripes through the signal acquisition circuit, and counts them, and the microprocessor displays the measurement results on the display unit in real time. The present invention uses optical fiber as the light and dark fringe acquisition probe, and since the optical fiber lighting area can be much smaller than the size of the light and dark fringes, the detection sensitivity can be greatly improved through the verification of the implementation scheme. In addition, since the fiber optic probe can be easily moved and operated, the measurement is more flexible and convenient.

Description

technical field [0001] The invention relates to the field of optical detection, in particular to an optical fiber-based automatic counting device and a counting method for optical stripes. Background technique [0002] Optical interference and diffraction measurement technology plays an important role in the field of optical detection. It is not only widely used in actual production and life, but also has great significance in optical teaching and scientific research in colleges and universities, such as Newton rings, Michelson interference, small hole diffraction and other experimental projects. . Taking the Michelson interference experiment as an example, the formula for measuring the wavelength of monochromatic light is: [0003] [0004] Among them, N is the number of fringes produced or disappeared by the Michelson interferometer, and Δd is the scale difference on the reading scale of the interferometer at this time. From this the wavelength λ of the measured monoc...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the large number of counts, it is easy to cause counting errors;

[0007] (2) The manual counting speed is slow, which seriously limits the progress of the experiment;

[0008] (3) Due to the weak brightness of the stripes, counting for a long time is easy to cause eye fatigue

[0010] (1) Photodiodes are used to collect stripes. When the stripes are thin, especially when the stripe size is smaller than the photodiode lighting area, it is difficult to achieve accurate counting

[0011] (2) Although the linear array CCD has high counting accuracy, the device is complicated and the cost is high

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