High Precision Measurement of Strain Distribution by Integrated Dot Centroid Tracking Method (Torque Measurement Using Distortional Displacement)

Precision Low Cost Electric Motor Flux and Torque Measurement Method

Torque and flux measurements in ac motor are often a complicated matter. For flux measurement, a coil or a field sensor must be inserted inside stator windings causing relevant costs especially for big machines. Anyway, measurement has not great accuracy since calibration is not easy. For torque measurement, a telemetry system can be installed on rotor axle but, especially for notable accuracy,...

Nanoscale Displacement and Strain Measurement

The mechanical testing of micro-electro-mechanical systems (MEMS) and nano-electro-mechanical systems (NEMS) requires precise measurements of displacement and strain in the nanometer scale. Integrated testing devices, including specimens, actuators and sensors, were designed and fabricated to overcome the aligning and gripping difficulties faced by previous separated micromechanical testing app...

Direct Torque Measurement of Hermetic Rotary Compressors Using Strain Gauge

Precision displacement measurement by active laser heterodyne interferometry.

We demonstrate an active laser heterodyne interferometer which can automatically compensate environmental disturbances and is capable of precision displacement measurement. Two Zeeman He-Ne lasers were employed. Laser II was used as the light source to stabilize the interferometer by using a piezomirror in a feedback loop. The hetereodyne signal of the two lasers was used to directly calibrate ...

Performance Evaluation of Hermetic Refrigeration Compressor Using Torque Measurement Method

A load stand has been built and used to det ermine the performance of an open type reciprocating r efrigeration compressor over a range of speeds. The load stand and instrumentation are desc ribed and sample test readings are given. Measured perform ance characteristics for the compressor over a range of speeds are p resented. Aspects of the load stand are discussed and conclusion s are drawn f...