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The confocal measurement principle

Polychromatic white light is focused onto the target surface by a multi-lens optical system. The lenses are arranged such that the white light is dispersed into a monochromatic light by controlled chromatic deviation. A certain distance is assigned to each wavelength by a factory calibration.

Only the wavelength which is exactly focused on the target is used for the measurement. This light reflected from the target surface is passed via a confocal aperture to the receiver which detects and processes the spectral changes.

System set-up

The confocal chromatic measurement system, optoNCDT 2401, consists of a closed loop LED controller and a sensor. A fibre optical cable, which can be of almost any length, connects the two components. The sensor can therefore operate at a large distance from the controller.

Performance and special features

This unique measuring principle enables displacements and distances to be measured with high precision. Both diffuse and specular surfaces can be measured. With transparent materials a one sided thickness measurement can be accomplished along with the distance measurement. Since the emitter and receiver are arranged in one axis, shadowing is avoided.

OPTO NCDT 2401 Measuring principle: Confocal Chromatic

Standard measuring ranges: 0.12/ 0.4 /1 /3 /10 / 24 mm

Unique miniature sensor heads with a 4mm diameter are also available in a 90 degree sideview version. Measuring ranges: 0.4 /1.5 /3.5 /6.5 mm

Linearity: <0.03 % FSO

Displacement Measurement Sensor

Features:

• Extreme high resolution (nanometers)
• Target independent measurement
• Tiny, constant measuring spot
• No shadowing by directly reflected beam
• One-sided thickness measurement (glass)