Sensor head classes
Currently, SmarAct offers four classes of sensor heads that were designed for a great variety of applications.
The sensor heads using a collimated beam are mainly used for large working ranges and distances. These heads can have a very small form factor.
A focused beam is mainly used for measurements on very small targets. The focusing sensor heads additionally oﬀer a large angular working range.
Line focusing sensor heads are used for an enhancement of signal intensity in one dimension. This allows improved performance in measurements on cylindrical targets, for example.
Special sensor head assemblies can be used for a wide range of applications. Three sensor heads can be pre-aligned for angular measurements, for example.
Sensor head options and customizations
Due to the Michelson principle, PicoScale sensor heads allow to perform differential displacement measurements of two target mirrors with a single sensor head. Therefore, the “ER” (external reference) option utilizes a beam splitter without a reference mirror so that two probe beams exit the sensor head.
Low reflectivity targets
PicoScale sensor heads allow to measure the displacement of targets that have almost arbitrary reflectivity without additional and sophisticated considerations. It can, however, be beneficial in terms of signal-to-noise ratio to increase the power in the probe beam. Therefore, the “BSR80” option utilizes a beam splitter with a 80:20 beam splitting ratio to guide more power into the probe beam.
Selection Guide for Sensor Heads
|Head type||Working range||Angular working range||Retro-reflector target?|
(More sensor heads coming soon. Please also see our customization overview.)
Various form factors
SmarAct manufactures all products in-house so that we can efficiently design and produce customized sensor heads. This includes customized solutions for setups with specific space constraints. For example, the “FR” (front reference) option utilizes a beam splitter, where the reference mirror of the Michelson interferometer is coated to the front surface so that the probe beam exits perpendicularly compared to a standard sensor head.
UHV and cold environments
The PicoScale sensor head type C01 can be used to measure in ultra-high vacuum with the corresponding option. For measurements in cryogenic environments please contact SmarAct.
For more options please refer to our customization overview. Feel free to contact us if you do not find the right head for your application: together we will find a solution!
Most PicoScale sensor heads utilize the open port of the Michelson interferometer to provide the SmarAlign window – a very convenient indicator for fast initial coarse alignment. Read more