| Sensor method |
Principle and characteristic |
Model name |
| Capacitance |
Displacement meter |
The probe and object being tested generate capacitance, and capacitance changes according to the distance "D". A capacitance-voltage conversion circuit measures displacement to output voltage, which is proportional to "D".
The principle is simple, and it measures minute displacement stability and precisely.
The measurement objects are a conductor and semiconductor. |
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ST-3501
ST-3511
ST-3512
ST-3521
ST-3571A |
| Thickness meter (Conductor) |
Fix the displacement probe with the known distance "c" on both sides, and measure "a" and "b", and then thickness "t" can be expressed in the following formula.
t = c - (a + b) |
 |
ST-3525 |
| Thickness meter (Insulation) |
Fix probe and ground electrode with the known distance "D", and insert the insulation of thickness "t" being tested in between.
As the capacitance varies, being proportional to the dielectric constant of the insulator and thickness "t", the thickness "t" of the object being tested is measured
when calibrated with the same insulator beforehand. |
 |
ST-3523 |
| Fiber optics |
Produces probes that bundle fiber optics for transmitting and receiving. Is measured using the principle that light quantity, which reflects to the receiving fiber from the object being tested, is changed by the distance "D". It is also suitable to measure vibrators that change to "D" rapidly. |
 |
ST-3711 |
| Heterodyne Laser Displacement Meter |
Using an optical heterodyne interferometer, displacement can be measured using the beat signal phase difference generated by the optical path difference of the measuring beam and reference beam. The reference beam is generated when the original light overlaps the light created when the laser is reflected off the object being tested.
Using a laser allows you to measure the operating distance between tiny measuring spots and the object being tested. Also it is possible to measure a variety of speeds, from motionless surfaces (which was difficult with the Doppler vibrometer) to highspeed vibrating surfaces. |
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