Laser displacement meter

The magnitude of the stress has been studied for a boehmite gel layer on a porous a-alumina support Voncken et al [1992] have found that among various stress measurement methods the cantilever principle is most suitable for studying porous thin films like gels. Using a laser displacement meter to detect the deflection of gel and support layers, they found that the tensile stress exerted on the drying membrane (gel)... 

Figure 10 shows the verification result of tire sensor function. The strip of the IPMC was fixed as a cantilever and was deformed manually. Its deformation was measured by a laser displacement meter, and tire output voltage was pre-amplified and measured. The size of the strip used in tire experiment was 20 x 2 mm and 0.2 mm of thickness. From tire result, the ou ut signals arise through the deformation of the strip, and the magnitude of tire ou ut signals is related to that of the... 

Nagai et al. [58] used laser focus displacement meter (LFDM, LT-8110 laser sensor head, Keyence Corp.) to monitor the pad surface. The pad condition is observed without contacting the pad surface. The displacement and surface roughness of the pad are monitored in situ by the LFDM. 

A method which competes with interferometric distance measurement is laser Doppler displacement. In this approach the Doppler shift of the beam reflected from a target is measured and integrated to obtain displacement. This method also is best suited to use indoors at distances no more than a few hundred meters. Table 2 compares some of the characteristics of these laser-based methods of distance measurement. 

The operation of proximity sensors can be based on a wide range of principles, including capacitance, induction, Hall and magnetic effects variable reluctance, linear variable differential transformer (LVDT), variable resistor mechanical and electromechanical limit switches optical, photoelectric, or fiber-optic sensors laser-based distance, dimension, or thickness sensors air gap sensors ultrasonic and displacement transducers. Their detection ranges vary from micrometers to meters, and their applications include the measurement of position, displacement, proximity, or operational limits in controlling moving components of valves and dampers. Either linear or angular position can be measured ... 

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