SpotOn USB 2.0-Position Sensing

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SpotOn USB 2.0-Position Sensing

The application program is compatible with Windows 7/8/10 OS (32 & 64 bit). For custom integration, an SDK package software is offered as standard.

A portable, fast and accurate optical beam positioning system having a USB2.0 interface.

The system is based on a 24 bit A/D electronics box, powered via the  USB2.0 port.

It offers simultaneous operation of one or two PSD’s in one system.

The PSD’s are Lateral Effect type or Four-Quadrant type.  There is a variety of sensor head types and sizes.

The update rate is up to 150 Hz when using a 500 Hz digital filter. The spectral range is 350-1100nm.


DetectorN – Lateral EffectL – Lateral EffectU – Four QuadrantQ – Four Quadrant
Size10 x 10 mm9 x 9 mm10 x 10 mm10 x 10 mm
TypeDual axis Si with glass coverDual axis Si with glass cover4x Si sectors seperated by 10 μm gap, glass cover4x Si sectors seperated by 10 μm gap, glass cover
Usable beam size⌀50μm to ⌀8 mm⌀50μm to ⌀9 mm⌀50μm to ⌀5 mm⌀50μm to ⌀5 mm
Poisition measurement range ⌀8 mm⌀9 mmOne beam radius up to ±2.5 mmOne beam radius up to ±2.5 mm
Position resolutionDown to 0.1 μm at 50 Hz digital filter plus averagingDown to 0.1 μm at 50 Hz digital filter plus averagingDown to 0.25% of beam sizeDown to 0.25% of beam size
Position accuracy±25 μm over 8 mm dia.±12.5 μm over 8 mm dia.±1μm or ±0.025% of beam size±1μm or ±0.025% of beam size
Update rate Max. 150 Hz at 500 Hz digital filters
Operational Spectral range350 – 1100 nm
Power range10 μW to 10 mW with attenuating ND filters
Power accuracy (*)±5%

Ordering Information

SPOTUSB – A complete system including manifold box, USB2.0 cable, software and user manual on CD disk, carrying case.

Select one or two sensor heads, calibration files are saved on the PSD heads and loads automatically to the software:

  • L – Lateral Effect PnP 9mmx9mm, no glass cover
  • N – Lateral Effect Pnp 10mX10mm, with glass cover
  • Q – Four Quadrant PnP 10mmX10mm with 30um gap, no glass cover
  • U – Four Quadrant PnP 10mmX10mm with 10um gap, with glass cover

Additional optional heads:

L44 – Lateral Effect PnP , usable beam size < 25mm

L18 – Lateral Effect PnP 18mmX18mm with glass cover

L4   – Lateral Effect PnP 4mmX4mm, no glass cover

Optional accessories:

NG4 filter – ND filter in housing (3/4″ – 32 thread)

NG9 filter   ”     “

NG10 filter  ”    “

Hood – 55mm long, for ambientlight suppression


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