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Lead Contents

Displacement / Measurement Sensors

Precautions for Safety Use
Precautions for Correct Use

Primary Contents

General notes

For notes for each product, see "Precautions" of each product.

Correct_Use_title

Mounting

Displacement measurement of objects with differing materials and color.

If the material or color of objects is noticeably different, measurement error can be reduced by mounting the sensor so that the line joining the light projection axis and the light reception axis is parallel to the boundary line of the objects, as shown in the diagram below.

Displacement_measurement_of_objects_with_differing_materials_and_color_diagrams

Measuring displacement in narrow grooves and depressions

If the object to be measured is in a depression or groove with wall-like sides, mount the sensor as shown in the diagram below so that the light projection axis and the light reception axis are not obstructed by the wall-like sides.

Measuring_displacement_in_narrow_grooves_and_depressions_diagrams

Displacement measurement of rotating objects

To measure rotating objects, the effects of vertical variations and positional variations can be minimized by mounting the sensor so that the line joining the light projection axis and the light reception axis is parallel to the axis of rotation.

Displacement_measurement_of_rotating_objects_diagrams

Displacement measurement of objects with a step-like level difference.

If the object to be measured has a step-like level difference, the effects of the step edge can be minimized by mounting the sensor so that the line joining the light projection axis and the light reception axis is parallel to the step edge.

Displacement_measurement_of_objects_with_a_step-like_level_difference_diagrams

Sensor head and peripheral walls

Light reflected from a wall will cause error. If the sensor must be mounted near a wall, mount the sensor so that the line joining the light projection axis and the light reception axis is parallel to the wall, as shown in the diagram below. Painting the wall a dull black will also help reduce reflection.

Sensor_head_and_peripheral_walls_diagrams

If the object is black

If the object is black, there will be little light reflection, the value from the PSD will decrease, and the resolution will decrease.
The following mounting method is effective in increasing the absolute value of light reflected from the object.

Move head closer: Move the sensor head as close as possible within the range of the measurement distance to increase the projected and reflected light.

If_the_object_is_black_diagram1

Receive light at the angle of regular reflection: Incline the sensor head when mounting so that the light reception axis is the same as the axis of regular reflecton with respect to the light projection axis.

If_the_object_is_black_diagram2