What is the confocal imaging principle of spectral confocal sensor? Friends who do not know and are interested in understanding can follow the spectrometer spectral confocal manufacturers to see, in fact, the confocal imaging of the spectral confocal sensor is based on two principles, what is it?

1. Confocal imaging

2. Dispersion coding of optical axis

A confocal device is an optical device in which an optical system produces an "S" image of the source point on the surface of an object... The scattered light reflected back is converged by the same optical system, imaging the spot of light on the hole as an "S." This small hole is located in front of the photodetector and is used to filter the light reaching the photodetector, so it is also known as a spatial filter.

Confocal devices are characterized by special signal-to-noise ratio. In dispersive confocal imaging, the optical system is the dispersive probe and the photodetector is the spectrometer. The dispersion coding of the optical axis means that the optical system has axial chromatic difference: each wavelength is focused at a different point along the axis. It is now assumed that the wavelength of the light reflected by the sample is in the dispersion coding range, so its wavelength λ0 can be focused on the surface of the photodetector.

When the reflected light (or backscattered light) beam reaches the pinhole plane, a specific wavelength of light can be focused on the pinhole, and light energy reaches the photosensitive part of the spectrometer through the pinhole. The imaging points of other wavelengths of light are too large to be blocked by small holes. The spectrometer decodes the sample position by recognizing the wavelength λ0. The spectrometer signal corresponds to the spectral redistribution of the collected light. It provides a spectral peak. As the object moves within the measurement range, the spectral peak on the spectrometer also changes.

These are the contents shared by Liyi Technology: confocal imaging raw measurements of spectral confocal sensors. Shenzhen Liyi Technology Co., Ltd. is a professional production and sales of displacement sensor, laser displacement sensor, Angle displacement sensor, spectral confocal sensor company, in need of friends can call to consult Liyi fiber coaxial displacement sensor manufacturers. Welcome your call!