METHOD FOR NON-CONTACT MEASUREMENT OF DEFORMATIONS OF LARGE OBJECTS BASED ON STRUCTURED LIGHTING

2020 ◽  
Keyword(s):  
Contact Measurement ◽  
Structured Lighting

Remote turbidity measurement with a laser reflectometer

1998 ◽  
Vol 37 (12) ◽  
pp. 255-261 ◽  
Author(s):  
Mark Johnson
Keyword(s):  
Water Surface ◽  
Free Water ◽  
Optical Scattering ◽  
Flowing Water ◽  
Water Stream ◽  
Water Turbidity ◽  
Water Colour ◽  
Contact Measurement ◽  
Optical Instruments ◽  
Better Than

A simple, laser-based reflectometer is described for the measurement of water turbidity via 180° optical scattering. Applications exist both in clean source waters (0-1000NTU) with a minimum detectable turbidity better than 1NTU, and in dense wastewater primary-clarifier sludges. The non-contact measurement is performed from a distance at least up to 10m, substantially avoiding the usual window fouling problems of optical instruments. By measuring directly in the process, through a free water surface or on the side of a flowing water stream, the difficulties of transporting sample to the instrument are also avoided. Extensions to be described allow measurement also of water colour.

Non-Contact Measurement of Molten Metal in Torpedo Ladles Using Microwaves

1990 ◽  
Vol 23 (10) ◽  
pp. 303-305
Author(s):  
K G Crudgington ◽  
M E London
Keyword(s):  
Molten Metal ◽  
Contact Measurement

Research of Zero Calibration in Conoscopic Holography Measurement Based on Image

2013 ◽  
Vol 303-306 ◽  
pp. 386-389
Author(s):  
Shu Yan Ren ◽  
Yong Gang Yang ◽  
Hai Long Duan
Keyword(s):  
Extreme Points ◽  
B Splines ◽  
Contact Measurement ◽  
Measurement Result ◽  
Common Path ◽  
Repeatability Error ◽  
Zero Position ◽  
Conoscopic Holography ◽  
Patch Image ◽  
Method Of Adjustment

Non-contact measurement based on conoscopic holography is a kind of interferometry with common path, so it is not influenced much by other factors such as vibration. But the measurement result is affected by the uniformity of the crystal, which is analyzed in this paper, and corresponding method of adjustment based on image is discussed. And B-splines function is used to calculate zero position in measurement image, which is fitted over the patch image in the neighborhood of gray extreme points of the stripes, which is important to reduce the repeatability error, optimize design, and improve the accuracy of system.

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