Photoelastic load measurement alarm device

Details Photoelastic load measurement alarm device Photoelastic load measurement alarm device

1975-08-04

1976-07-27

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 356 34, 73 88A, 212 39MS, G02F 101

Patent

active

039719340

ABSTRACT:
This invention relates to a photoelastic load measurement device which measures the load on the cable of the crane by measuring the strain in a particular structural member of the crane and is calibrated to operate an alarm, indicator and/or recorder. A source of polarized light directs a beam of light through a photoelastic plate to an analyzer plate and a photocell. The photoelastic plate is subjected to stress from the structural member which varies with the load on the cable of the crane. The stress in the photoelastic plate subjects the beam of polarized light to temporary double refraction (birefringence), and the intensity of the light received by the photocell through the analyzer plate is dependent upon the degree of retardation of the light in the photoelastic plate. The output signal from the photocell is amplified to operate the alarm, indicator and/or recorder. The device includes apparatus which automatically compensates for changes in ambient temperature and variations in boom angle.

REFERENCES:
patent: 3330154 (1967-07-01), Harbern et al.
patent: 3336832 (1967-08-01), Snavely
patent: 3596100 (1971-07-01), Hollick
patent: 3672772 (1972-06-01), Primak
patent: 3834550 (1974-09-01), Eiler
patent: 3847481 (1974-11-01), Paraskevaj et al.
patent: 3853001 (1974-12-01), Mock

Affiliated with

Also associated with

Rating

Photoelastic load measurement alarm device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photoelastic load measurement alarm device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelastic load measurement alarm device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1626356