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          4. Spectral Interference Displacement Sensor
          5. Micro-head Spectral-interference Laser Displacement Meter
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          7. Sensor Head, Long-distance Type

          Micro-head Spectral-interference Laser Displacement MeterSI-F series

          Sensor Head, Long-distance Type



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          Long distance type Sensor head

          Measurement range

          11.3 to 12.35 mm 0.04" to 0.49" *1

          Light source

          Infrared SLD Central wavelength 820 nm Output 0.6 mW Class 1 Laser product (IEC60825-1/FDA (CDRH) Part 1040.10*2)

          Spot diameter

          ø40 µm ø0.001575"*3


          ±0.3 µm ±0.000012"*4


          0.25 µm 0.00000984"*5

          Sampling cycle

          200 µs

          Light source for guide

          Red semiconductor laser Wavelength 655 nm Output 0.1 mW Class 1 Laser product (IEC60825-1/FDA (CDRH) Part 1040.10*2)

          LED display

          Target near center of measurement range: green lights. Target within measurement range: orange lights. Target outside measurement range: Flashes orange.

          Temperature fluctuation

          0.01% of F.S./°C

          Environmental resistance

          Enclosure rating


          Ambient light

          Incandescent lamp or Fluorescent lamp: 10,000 lux max.

          Ambient temperature

          0 to +40 °C 32 to 104 °F

          Relative humidity

          35 to 85 % RH (No condensation)

          Vibration resistance

          10 to 55 Hz, Double amplitude 1.5 mm 0.06", 2 hours in each of the X, Y, and Z directions




          Sensor head

          Spectrum unit



          Approx. 38 g (including cable)

          *1 Indicates distance from the front of the sensor head. For long distance type sensor heads there is an individual difference of up to ±0.2 mm ±0.01".
          *2 The laser classification for FDA (CDRH) is implemented based on IEC60825-1 in accordance with the requirements of Laser Notice No. 50.
          *3 Indicates the minimum beam spot diameter within the measurement range.
          *4 This value is obtained when the measurement target is a glass plate with the number of averaging measurements set to 256.
          *5 This value is obtained by measuring a glass plate surface located at the center of the measurement range with the number of averaging measurements set to 4,096.

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          Measurement Sensors