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  4. Optical micrometers
  5. FDRF651 Optical Micrometer

FDRF651 Optical Micrometer

Direct through beam micrometer


Key features

  • Measurement range: 25, 50, 75, 100mm
  • Linearity starting at ± 5µm
  • Fast measurement response
  • Up to 1000mm distance transmitter-receiver
  • Analogue and digital output
  • IP67 enclosure

About FDRF651 Optical Micrometer

Direct thru-beam micrometer, long distance between receiver/transmitter

Optical Micrometers: Laser/LED based for diameter, edge and gap measurement
Optical Micrometers are devices providing non-contact measurement of diameter of wires, rods and cylinders as well as gaps, edge positions and other dimensional characteristics of geometric objects. Althen offers both laser and LED based optical micrometers.

These micrometers determine with high precision the dimension and position of an object by using the "shadow" measurement principle. Collimated laser light (the rays are parallel) is transmitted by the system lens arrangement towards a receiver. The edges of the shadow in the beam’s curtain are accurately measured in the receiver’s detector array.

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Technical Specifications

Specification Value
Accuracy ±3-20µm
Enclosure rating IP67
Housing material Aluminum
Light source LED or laser
Measurement range 25 - 100mm
Sample frequency 2kHz, 10kHz
Signal output RS232, RS485, Ethernet, 4-20mA, 0-10V

Related products

Need something else?

FDRF656 Optical Micrometer

  • Measuring range: 5 mm to 25 mm
  • High precision through beam micrometers
  • With telecentric lens
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