Retro-reflectors can be used as target for PICOSCALE measurements. They reflect light anti-parallel with respect to the direction of incidence, whereas the orientation of the reflector plays a minor role. Thus, alignment of sensor heads to the target becomes very
easy: The measurement beam must only hit the retro-reflector in the center and light will be reflected back into the sensor head so that the PICOSCALE can track the displacement. Furthermore, due to the very limited angular tolerance of a sensor head in combination
with a plane mirror, retro-reflectors are often the only possibility to measure large angles.

Download Specification Sheet

*10 mm green glass sphere in the image for scale.

Mounting Accessories

We offer adapter plates for all sensor heads to fix them in conventional ½” or 1” mounts. The sensor head is automatically secured in the adapter when it is fastened in a mount.



Remote alignment of sensor heads with SmarAct’s STT mirror mount. A small aluminum spacer with 1/2” diameter can be attached for easy assembly in setups with strict space constraints.

Manual alignment mount by using flexures and fine adjustment screws.


Angular measurement assembly with three C01 sensor heads in a L-shaped configuration. Furthermore, a variant for C03 heads is available which can be used together with a corresponding retro-reflector target assembly.