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  5. VIEW Sensor Options - Rainbow Probe ...

VIEW Sensor Options - Rainbow Probe Sensors

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High resolution non-contact measurement – Innovative Rainbow Probe analyzes the optical spectrum of reflected light to measure surface height changes. Measures where other sensors cannot - Rainbow Probe easily measures transparent, translucent, fragile, liquid or easily deformable surfaces. The right probe for your application - A range of CL-series and RP- series probes are available, each with a unique measuring range, working distance, axial resolution, accuracy, and spot size.

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An upgrade to the TTL are the QVI CL-Series and RP-series probes. These chromatic confocal sensors are mounted at an offset to the optical path and connect to a proprietary spectrometer. Each of these are controlled by VIEW Metrology Software (VMS). VIEW supports several sensors that vary in size and capabilities. Designed to give extremely accurate and precise Z data, these sensors are excellent for obtaining 3D data at the microscopic level, and with measuring ranges that vary from 150 microns to 24 millimeters, the rainbow probe sensors fit a wide variety of applications. For example, the middle of the field QVI RP1500 has a measuring range of 1500 microns with a resolution of 40 nm.

The optical principle of chromatic confocal imaging is shown in the following setup:

An incident white light pinhole is imaged through a chromatic objective into a continuum of monochromatic images along the Z-Axis, thus providing a “color coding” along the optical axis.

When an object is present in this “colored” field, a unique wavelength is perfectly focused at its surface and then reflected into the optical system.

This backscattered beam passes through a filtering pinhole into a spectrograph, which determines the wavelength which has been perfectly focused on the object, and then accuratley determines its position in the measuring field.

The confocal chromatic imaging gives access to reliable, accurate, and reproducible dimentional measurements with extremely high resolution.