Is it true that spectral confocal method does not require any surface? A beam of a wide spectrum of polychromatic light (white) is emitted from the light source, spectral dispersion occurs through the dispersion lens, and a single color of light of different wavelengths is formed in the range. The focus of each wavelength corresponds to a distance value. The measured light is reflected back to the surface of the object, and only the single-color light that meets the confocal condition can be sensed by the spectrometer through the hole.

The distance value is obtained by calculating the wavelength of the sensed focus. Spectral confocal method can ensure that even if the object is tilted or warped, it can also be measured with high precision, and the measurement point will not change.

The spectral confocal displacement sensor is coaxial measurement, that is, the emitted light and the returned light are on an axis. Based on this, whether it is a diffuse reflective surface or a mirror, you can receive the light back. From this point of view, it is indeed less than the laser triangle reflection method on the surface of the measured object.

However, if the measured object has a relatively sharp interface, or a large particle, it may also produce complex stray light, or the reflected signal fluctuates greatly, in which case the corresponding filtering method can be used, but it may lead to measurement distortion.

Working with infrared light, the spectral confocal sensor is perfect for non-contact thickness measurements, even when one side of the material is opaque. With a large measurement range (18 µm to 3,000 µm), the sensor can be used for a wide range of measurement tasks in quality assurance and production of wafers, solar cells and plastic products. Is the spectral confocal method shared by the spectrometer confocal manufacturer really without any requirements for the surface? I hope I can help my friends in need.

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!