Optical device for measuring the speed of a moved surface by means of a measuring light beam from a laser
First Claim
1. An optical device for measuring the speed of a moving surface through utilization of a laser beam split into two sub-beams, said optical device comprising:
- a transmitting prism arrangement comprising two prism bodies, each of said prism bodies being associated with one of said sub-beams;
each prism body having base surfaces, refractive surfaces and reflective surfaces arranged and oriented for allowing said associated sub-beam to enter said respective prism body to be guided in said respective prism body and to leave said respective prism body;
said sub-beam leaving said prism body being displaced outwardly in relation to a center plane of said transmitting prism arrangement between said prism bodies so that the degree of beam splitting is increased and said sub-beams converge on a common point of intersection;
said prism bodies being secured at a glass mounting plate and said base surfaces of said prism bodies being arranged in a plane-parallel manner.
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Accused Products
Abstract
The invention relates to an optical device which serves in particular for measuring the speed of a moved surface with the aid of a measuring beam from a laser. The measuring beam is split into two parts, directed through prisms to converge towards the moved surface and received again frequency-shifted by the Doppler effect. For each part beam there is a single prism body through which each part beam is guided outwards to intensify splitting and is deflected to bring about convergence. Each prism is preferably secured to a plane-parallel glass plate so that very good, lasting adjustment is possible.
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Citations
3 Claims
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1. An optical device for measuring the speed of a moving surface through utilization of a laser beam split into two sub-beams, said optical device comprising:
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a transmitting prism arrangement comprising two prism bodies, each of said prism bodies being associated with one of said sub-beams; each prism body having base surfaces, refractive surfaces and reflective surfaces arranged and oriented for allowing said associated sub-beam to enter said respective prism body to be guided in said respective prism body and to leave said respective prism body; said sub-beam leaving said prism body being displaced outwardly in relation to a center plane of said transmitting prism arrangement between said prism bodies so that the degree of beam splitting is increased and said sub-beams converge on a common point of intersection; said prism bodies being secured at a glass mounting plate and said base surfaces of said prism bodies being arranged in a plane-parallel manner. - View Dependent Claims (2, 3)
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Specification