Laser distance sensors based on the triangulation principle are suitable for non-contact measurement of travel, distance, and position over short distances. During laser triangulation, the laser beam strikes an object and is reproduced at a specific angle on a position-sensitive detector, for example, a spatially resolving photodiode. If the distance of the object from the light source changes, the position of the dot on the detector and the distance can be determined with the help of an angle calculation.
Laser triangulation is well suited for continuous distance measurement of moving objects for short distances ranging from a few mm up to several meters. Most triangulation measurement systems measure distances to a single object. In this case, the most suitable detectors are one-dimensional position-sensitive diodes (PSD), which can be used to determine the distance to the measuring object directly via the position of the dot on the photodiode. First Sensor's PSDs offer high sensitivities in the red and near infrared (NIR) wavelength range as well as outstanding linearity and spatial resolution.
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