In recent years, with the continuous upgrading of 3C product appearance design and material process, the automatic measurement of 3C product processing and manufacturing process is increasingly using spectral confocal displacement sensors. The spectral confocal displacement sensor has a unique advantage in many measurement applications such as the back shell of the mobile phone, the middle frame segment difference, the camera segment difference, and the 2D/3D screen profile. Spectral confocal displacement sensor is a new type of sensor defined in the Chinese automated measurement market, which can solve many high-precision measurement applications. The LED light source emits a wide spectrum of polychromatic light (white), spectral dispersion occurs through the dispersion lens, and monochromatic light of different wavelengths is formed within 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 monochromatic light that meets the confocal condition can be sensed by the spectrometer through the small hole. The distance value is obtained by calculating the wavelength of the sensed focus.

Large angular characteristics

Angular characteristics refer to the maximum inclination Angle of the sample that can be measured. When the laser displacement sensor is measuring non-plane, the tilt or surface cannot be accurately measured due to the difference caused by the return light. The spectral confocal measurement technology of the THINKFOCUS sensor can ensure that even if the measured object has too large inclination or surface, it can also be highly accurate shape measurement. For diffuse reflection surface THINKFOCUS confocal displacement sensor probe can reach ±87°, for specular reflection THINKFOCUS confocal displacement sensor various probes can basically reach ±20° or more. Most of the Japanese and domestic spectral confocal displacement sensors are not clearly marked because of the very low parameter. Poor angular characteristics can cause many irregular positions to be improperly measured. High-end spectral confocal sensors are required to measure non-planar surfaces, especially for 3D glass contours, dispensing glue heights, and high-gloss metal surface segment differences. 3D glass profile measurement sensor and analysis software THINKFOCUSS3D-1100

The measurement spot is smaller

Because the laser displacement sensor adopts the principle of triangulation and has large light spot, there are many problems such as shape contour distortion, abnormal fluctuation of edge position and decrease of detection accuracy caused by multi-surface reflection when measuring section difference and gap. THINKFOCUS uses spectral confocal measurement technology to measure the minimum spot of 10μm, which can measure the clear contour and guarantee the very high measurement accuracy.

The key to confocal effect is to focus the reflected light onto the pinhole, and then the light sensor receives the light signal through the pinhole to analyze the displacement measurement value. The entire optical principle determines that the smaller the measured light spot, the higher the system resolution and accuracy. Due to the weak light receiving ability of Japanese and domestic spectral confocal sensors, the system stability is poor, and the size of the measured light spot can only be deliberately amplified, so that the accuracy of the sensor is greatly reduced, but the resolution will not be significantly displayed. In effect, the spot of light measured by the sensor acts like an intelligence barrier. THINKFOCUS spectral confocal displacement sensors measure light spots in the range of 10-20um. The horizontal resolution of the sensor is half of the measurement spot, the measurement spot size determines the horizontal resolution of the sensor, such as measuring a 0.1mm wide edge step, must use high-end spectral confocal sensor.

Shenzhen Liyi Technology Co., Ltd. is a professional production and sales of displacement sensor, color 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!