Laser focus and spectral confocal sensors each have their own characteristics in terms of altimetry accuracy, but generally speaking, spectral confocal sensors have the advantage in terms of altimetry accuracy.

Laser Focusing For High Accuracy：

Laser focusing techniques typically rely on the emission and reception of a laser beam to calculate the height or distance of an object by measuring the time (or phase difference) from the time the laser beam is emitted to the time it is reflected by the object and returned to the receiver. The accuracy of this method is affected by a variety of factors, including the divergence angle of the laser beam, the sensitivity of the receiver, and environmental factors (e.g., temperature, vibration). Although laser focusing technology is quite mature and has achieved highly accurate measurements in many applications, its performance may be limited when confronted with complex surfaces or where extremely high accuracy is required.

Spectral Confocal Sensor Measures High Accuracy:

Spectral confocal sensors, on the other hand, make use of the principle of optical dispersion, whereby light of different wavelengths is focused on different positions after passing through a dispersive objective lens by means of complex-colored light emitted by a broad-spectrum light source (e.g., white LED). Only the wavelengths of light focused on the surface of the object to be measured can pass through the detection aperture and be detected by the spectrometer, thus extracting the peak wavelengths and realizing the precise measurement of the position of the object surface. Spectral confocal sensors have the following advantages to improve the accuracy of measurement:

1, High precision: spectral confocal sensors determine the height of the object by accurately measuring the peak wavelength, this method has very high resolution and accuracy, which can meet the needs of the precision measurement field.

2, Non-contact: non-contact measurement avoids surface damage and measurement errors that may be caused by traditional contact measurement, and at the same time reduces the measurement instability caused by contact force.

3, High efficiency: spectral confocal sensors can realize fast scanning measurement, suitable for dynamic and online measurement scenarios, improving the measurement efficiency.

4, Adaptable: spectral confocal sensors can measure a variety of different reflective characteristics of the measured surface, including transparent, mirror, highly reflective and other material surfaces, has a wide range of applicability.

In a comprehensive comparison in terms of measurement accuracy, spectral confocal sensors typically have higher accuracy and resolution. This is due to their unique measurement principle and advanced technology implementation. However, it should be noted that the increase in measurement accuracy is also accompanied by an increase in cost and technical complexity. Therefore, when choosing a measurement solution, comprehensive consideration needs to be made based on specific application scenarios and requirements.