Detection based on “Contact Measurement”
What is a Contact Positioning Sensor?

Outline

Outline

As the name indicates, this is a sensor measuring the position of a target by directly contacting it. When the height of the spindle changes as shown in the figure on the right, the sensor internally calculates the amount of displacement. Contact Positioning Sensors are mainly used for detecting the height, thickness, or warpage of the target.

Air push type measuring by extending a spindle

Outline

Since measurement is possible with the sensor head being fixed, no mechanism is required to move the sensor head. This saves installation space and greatly reduces man-hours during installation.

Features

The following table shows typical characteristics that vary depending on the detection system.

Sensor type comparison based on the detection method

Item Inductive Optical Ultrasonic Laser focus Contact
Detectable target Metal Almost all materials Almost all materials Almost all materials Solid
Measuring distance Short Normal Long Short Short
Accuracy High High Low High High
Response speed Fast Fast Slow Normal Slow
Dust, water, oil, etc. Unaffected Normal Normal Normal Unaffected
Measuring surface Normal Small Large Small Small
Item Inductive Optical Ultrasonic
Detectable target Metal Almost all materials Almost all materials
Measuring distance Short Normal Long
Accuracy High High Low
Response speed Fast Fast Slow
Dust, water, oil, etc. Unaffected Normal Normal
Measuring surface Normal Small Large
Item Laser focus Contact
Detectable target Almost all materials Solid
Measuring distance Short Short
Accuracy High High
Response speed Normal Slow
Slow Normal Unaffected
Measuring surface Small Small
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