Laser Measurement of Building Vibration and Displacement

Laser Doppler Displacement Measurement

Existing precision displacement-measuring devices are primarily based on linear encoders (optical or magnetic) or laser interferometers. Most encoders use grating scales and frequency counters, while most interferometers use stabilized lasers and fringe counters. In general, interferometers are more expensive and more accurate than linear encoders. However, there are large gaps in price and per...

Torsional and Bending Vibration Measurement on Rotors Using Laser Technology

Surface Contour Measurement Using a Short Range Laser Displacement Sensor

Center for Automotive Materials and Manufacturing National Research Council Canada 800 Collip Circle, London, Ontario, Canada, N6G 4X8 Contact: [email protected] Reviewed, accepted September 18, 2009 Abstract Non-contact freeform surface measurement is widely used in industry. To acquire the surface data, a laser displacement sensor and a motion system are typically used. One of the factors t...

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 ...

study the effects of low level laser diode on no production and healing of diabetic and cortisone acetate and normal wounded sd rats

nitric oxide (no) is a small molecule synthesized by most of mammalian cells with diverse biological activities including vasodilatation, host defense and wound healing. impaired wound healing is a common occurrence among diabetics and patients receiving glucocorticoid therapy. on the other hand the application of laser in biomedical area have been increased. thus, the current studies were desi...