Method and device for interference fringe automatic counting used for Michelson interferometer

Abstract

The invention discloses a method and a device for interference fringe automatic counting used for a Michelson interferometer. The method for interference fringe automatic counting used for the Michelson interferometer comprises initializing an interference fringe count value, enabling a photoelectric sensor to be aimed at an interference fringe, adjusting drum wheels of the Michelson interferometer, collecting analog voltage signals output by the photoelectric sensor at the same time, filtering and eliminating a 50 Hz artificial lighting device light source interference signal, converting the artificial lighting device light source interference signal into a digital voltage signal, converting the digital voltage signal into high electrical level or low electrical level, and adding one to the interference fringe count value and outputting the count value when converting from the high electrical level to the low electrical level is detected. The device for interference fringe automatic counting used for the Michelson interferometer comprises a mainframe box with a master control circuit board and a power supply circuit board, wherein a power switch, a power socket, a flexible metal tube, a push-button unit, a liquid crystal display and a power indicator light are arranged on the mainframe box, and a front-end amplifying circuit, a 50 Hz light source filter circuit, an analog-digital conversion circuit and a microprocessor are arranged on the master control circuit board. The method and the device for interference fringe automatic counting used for the Michelson interferometer have the advantages of being high in counting accuracy, strong in anti-interference performance, and high in counting efficiency.

Description

technical field [0001] The invention relates to the field of physics teaching experiment instruments, in particular to an automatic counting method and device for interference fringes used in a Michelson interferometer. Background technique [0002] Using the Michelson interferometer to measure the wavelength of laser light is an important experimental project in university physics experiments. The key to the experiment is to read the number of interference fringes of light, which requires continuous counting of hundreds of "emerging" or "indenting" interference fringes. For fringes, it is very difficult to count the small interference fringes by staring at the small interference fringes for a long time during the experiment, and sometimes counting errors are prone to occur due to eye fatigue, resulting in large experimental errors. Moreover, if the same Michelson interferometer is operated by different people or different times by the same person, the number of interference...

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Problems solved by technology

[0002] Using the Michelson interferometer to measure the wavelength of laser light is an important experimental project in university physics experiments. The key to the experiment is to read the number of interference fringes of light, which requires continuous counting of hundreds of "emerging" or "indenting" interference fringes. When doing experiments, it is very difficult to count the small interference fringes with the eyes for a long time, and sometimes counting errors are prone to occur due to eye fatigue, resulting in large experimental errors

Moreover, if the same Michelson interferometer is operated by different people or different times by the same person, the number of interference fringes finally counted may vary greatly, and may even need to be redone. Counting the interference fringes of the instrument is time-consuming and laborious, very inefficient and error-prone

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