Photoelastic stress sensor signal processor

Details Photoelastic stress sensor signal processor Photoelastic stress sensor signal processor

1984-09-13

1985-05-07

Ciarlante, Anthony V.

Optics: measuring and testing

Material strain analysis

With polarized light

73705, 7386238, G01B 1118

Patent

active

045154732

ABSTRACT:
A signal processor is arranged to process polarized light signals obtained from a stress sensor of the type having a photoelastic element that responds to stress by causing a phase difference between components of the polarized light propagating through that element. The stress sensor provides two output beams, each of which has a different polarized component of the transmitted light. The signal processor employs a pair of photodetectors which respond to the intensities of the two polarized light beams by converting the polarized light into electrical signals. Those two electrical signals provide the inputs to a difference differentiator that provides an output proportional to the difference between the derivatives of the inputs. The two electrical output signals of the photodetectors are also applied as inputs to a multiplier whose output is related to the product of its inputs. The square root of the output of the multiplier is obtained from a square root device and is used as the divisor in a divider whose numerator is the output of the difference differentiator. The output of the divider is applied to the input of an integrator whose output is a measure of the stress imposed on the photoelastic element.

REFERENCES:
patent: 3950987 (1976-04-01), Slezinger et al.
patent: 4010632 (1977-03-01), Slezinger et al.
patent: 4321831 (1982-03-01), Tomlinson et al.
patent: 4368645 (1983-01-01), Glenn et al.
patent: 4442350 (1984-04-01), Rashleigh

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