On automated production lines, the challenges faced by in-line inspection equipment go far beyond mere “inaccuracy”—on-site conditions such as high temperatures, oil contamination, electromagnetic interference, and confined spaces, as well as constantly changing materials being inspected, can all cause measurement data drift or even sensor failure. For real-time control tasks such as thickness monitoring, vibration monitoring, and height sorting, what is required is not just a high-precision measuring instrument, but an industrial-grade, highly stable, and easily integrable in-line sensor.

I. Resistance to Ambient Light Interference and Temperature Stability

Factory lighting and light signals from nearby equipment often serve as sources of interference for photoelectric sensors. Spectral confocal sensors incorporate built-in active light source modulation and filtering algorithms, receiving only the reflected spectrum that matches the coding of their own light source, making them virtually insensitive to ambient light. In addition, the optical components and spectrometer are designed with precise temperature compensation; even with fluctuations in workshop temperature or during prolonged continuous operation, measurement zero-point drift is extremely low, eliminating the need for frequent recalibration.

II. High-Speed Sampling to Capture Dynamic Processes

In vibration monitoring, rotational shaft runout measurement, or high-speed sorting applications, sensors must have sufficient sampling rates. Spectral confocal displacement sensors support sampling frequencies in the kHz range (with some models reaching over 10 kHz), enabling them to capture minute changes in object displacement in real time. For example, in spindle thermal elongation monitoring, they can continuously track changes in the spindle end face position, providing dynamic data for machine tool thermal compensation; in nozzle height detection for high-speed pick-and-place machines, they can quickly determine whether the nozzle is worn or has foreign matter adhering to it.

III. Design Featuring a Small Spot Size and Blind Zones, Suitable for Compact Spaces

Modern automated equipment is becoming increasingly compact, resulting in limited space for sensor installation. Spectral confocal sensors feature a coaxial optical path design, in which the transmitter and receiver share the same lens; light is emitted perpendicularly, eliminating measurement blind spots (with an extremely small dead zone). Their focused spot can be as small as a few micrometers, making them suitable for measuring minute features such as chip pad heights and connector terminal contact positions. The sensor probe is compact and can be easily integrated into confined workstations. It does not require strict alignment and offers greater tolerance for installation orientation than some triangulation-based sensors.