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Measurement sensor - Displacement Sensors

Measurement sensor

Features

Measurement sensors have an emitter and a receiver for measuring the width or the position of an object.
There are two methods; the light intensity variation method that identifies changes in the amount of light received and the CCD method that uses a CCD on the receiving element.

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Principle of detection

Light intensity variation method

Light is emitted parallel to the receiver from the emitter, and this parallel light is collected in the receiving element through the receiver lens. If there is a light interrupted object within the parallel light, then the light is interrupted and the amount of light received changes.
Due to this change, the amount of light can be output as the size of the light interrupted object.

CCD method

Light is emitted parallel to the receiver from the emitter, and the linear CCD image sensor on the receiver receives the light.
If there is a light interrupted object within the parallel light, then the light is interrupted and a shadow that is proportional to the size of the light interrupted object is produced on the CCD. Due to this shadow, the size and position of the object is output.

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Effective use of the measurement sensors

Shading calibration

The CCD method measurement sensors have variations in the distribution of light intensity from the semiconductor laser that is the light source and the CCD image sensor has variations in sensitivity to the light received. Therefore, the distribution of light-receiving sensitivity becomes uneven. In order to equalize it, the LD series (LD-C60) has the shading calibration function.
Implement the shading calibration before sensing.

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