Abstract The variable relative distance d between the comparator and a test surface is measured by means of an optical system comprising a first glass-fiber bundle which directs a luminous flux to the surface and is surrounded by a second glass-fiber bundle which recieves the reflected flux and directs the flux to a receiver. The bundle of receiving fibers consists of three juxtaposed layers, namely a first layer which is adjacent to the emitting bundle and the fibers of which are directed towards a first receiver, a second intermediate layer in which 50 percent of the fibers are directed towards the first receiver and 50 percent of the fibers are directed towards a second receiver, and a third external layer of fibers directed towards the second receiver. The width of the intermediate layer is such that the value of d at which the signal of the first receiver is of maximum value is equal to the value of d at which the signal of the second receiver is located at the center at its linear range of variation.
Inventors
👤 R Brelot
👤 J Tourret
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-29 17:06
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/026
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
An optical comparator providing integrated reflectivity compensation to measure the variable relative distance d between the comparator and a surface, the optical system of the comparator being constituted by a first glass-fiber bundle which emits a reflected luminous flux towards the surface and is surrounded by a second glass-fiber bundle which receives the reflected flux and directs the flux to a receiver, wherein the bundle of receiving fibers is constituted by three juxtaposed layers consisting of a first layer which is adjacent to the emitting bundle and the fibers of which are directed towards a first receiver providing a signal, a second intermediate layer in which 50 percent of the fibers are directed towards the first receiver and 50 percent of the fibers are directed towards a second receiver providing a signal, and a third external layer of fibers directed towards the second receiver, the width of the intermediate layer being so determined that the value dc1 of d at which the signal of the first receiver is of maximum value is equal to the value do2 of d at which the signal of the second receiver is located at the center of its linear range of variation.
Claim 2
Dependent Claim
198 words
An optical comparator providing integrated reflectivity compensation to measure the variable relative distance d between the comparator and a surface, the optical system of the comparator being constituted by a first glass-fiber bundle which emits a reflected luminous flux towards the surface and is surrounded by a second glass-fiber bundle which receives the reflected flux and directs the flux to a receiver, wherein the bundle of receiving fibers is constituted by three juxtaposed layers consisting of a first layer which is adjacent to the emitting bundle and the fibers of which are directed towards a first receiver providing a signal, a second intermediate layer in which 50 percent of the fibers are directed towards the first receiver and 50 percent of the fibers are directed towards a second receiver providing a signal, and a third external layer of fibers directed towards the second receiver, the width of the intermediate layer being so determined that the value dc1 of d at which the signal of the first receiver is of maximum value is equal to the value do2 of d at which the signal of the second receiver is located at the center of its linear range of variation.
Claim 3
Dependent Claim
28 words
An optical comparator according to claim 1, wherein the second receiver carries out the measurement and the first receiver carries out the compensation for reflectivity of the surface.
Claim 4
Dependent Claim
26 words
An optical comparator according to claim 1 wherein the width of the bundle of receiving layers remains constant while the intermediate layer has a stationary mid-plane.
Claim 5
Dependent Claim
60 words
An optical comparator according to claim 1, wherein the position of the mid-plane of the intermediate layer is determined so that the range of compensation of the first receiver when the signal remains equal to its maximum value to within 1 percent has a width at least equal to that of a measuring field in respect of the distance d.