The new confocalDT IFS 2405 series of confocal sensors also benefit from large stand-off distances (up to 100mm), providing users with greater flexibility in terms of the variety of applications in which the sensor can be used. In addition, the tilt angle of the sensor has been increased significantly (up to 34 degrees), which provides better performance when measuring across changing surface features.

 

IFS 2405 sensors are designed for measurement tasks that require maximum precision – typically research and development tasks, laboratory and medical, semiconductor manufacturing, glass production and plastics processing. As well as distance measurements on reflective and transparent materials, the sensors can also be used for one-sided thickness measurement of clear film, boards or layers. The sensors do not contain any electrical components and so are also suitable for use in ATEX hazardous areas.

 

The confocalDT IFS 2405 series comprises five sensors with measuring ranges from 0.3mm up to 30mm. Spot diameter is from 6µm up to 50µm. Maximum resolution is 0.01µm and maximum linearity is 0.3µm.

 

The confocal chromatic measuring principle works by focusing polychromatic white light onto the target surface using a multi-lens optical system. The lenses are arranged in such a way that the white light is dispersed into a monochromatic light by controlled chromatic deviation (aberration). A certain deviation (specific distance) is assigned to each wavelength by a factory calibration. Only the wavelength that is exactly focussed on the target surface or material is used for the measurement. This light reflected from the target surface is passed through a confocal aperture onto a spectrometer, which detects and processes the spectral changes.

 

Both diffuse and specular surfaces can be measured using the confocal chromatic principle. However, the majority of applications in which the sensor is selected are when the target is highly polished or even mirrored. With transparent materials such as glass or plastic, a one-sided thickness measurement can be achieved along with the distance measurement to either surface. Also, because the emitter and receiver are arranged in one axis, shadowing is avoided.

 

 

The new confocalDT IFS 2405 series is offered alongside Micro-Epsilon’s confocalDT 2451 and confocalDT 2471 controllers. These controllers offer a range of outstanding technical benefits, including faster measuring rates, up to four times better signal-to-noise ratios, and up to 100 times faster real time surface compensation for difficult-to-measure surfaces.