US4737624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optoelectric distance measuring apparatus with an optical measuring probe with shared optics
Assignee: Individual
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Filing: 1986-05-18
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Granted: 1988-04-12
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Expires: 2006-05-18
Abstract
Abstract In an optoelectric distance measuring apparatus, short light pulses emitted by a laser diode are directed via a measuring probe (2) against a target object (9). The light signals reflected are collected by the measuring probe (2) and fed to a photodiode which transmits the thus-formed electric pulse signals to a control and evaluation unit. In order to make it possible to perform an accurate measurement even in the proximate area, the measuring probe (2) is provided with a double face mirror (23) extending along the optical axis of the lens (22) up to the ends of the emitting lightguide (8) and the receiving lightguide (10) which are situated approximately in the zone of the focal point. Preferably, a total-reflecting mirror in the form of two glass prisms is provided, an air gap being located between these prisms. The measuring probe (2) is made as a separate structural part and can be connected by a flexible lightguide cable to a basic unit containing the components for producing the light pulses, for transformation of the received light signals into electric pulse signals, and for the processing and evaluation of the electric pulse signals.
Inventors
- 👤 Rudolf Schwarte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:50
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G01S17/10; A; A61; A61B; A61B1/00; A61B1/00163; A61B1/00165; G01S7/00; G01S7/48; G01S7/481; G01S7/4818
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
In an optoelectric distance measuring apparatus comprising a laser diode for emitting short light pulses, an emitting lightguide directing said emitted light pulses toward a target, a lens disposed intermediate said emitting lightguide and a said target, a receiving lightguide receiving said light pulses reflected by a said target, a photodiode converting said received light pulses to electric pulse signals, a time comparator to which said electric pulse signals are fed, a clock generator having gate signals controlled by said time comparator and emitting clock pulses, and a counter to which said clock pulses are gated; the improvement in which said emitting and receiving lightguides terminate in distal ends disposed approximately at the focal point of said lens, and a double face reflecting means extends along the optical axis of said lens from adjacent said distal ends of said emitting and receiving lightguides to said lens, whereby a single said lens is effective to focus both said emitted and said received light pulses, without interference therebetween.
Claim 2
Dependent Claim
166 words
In an optoelectric distance measuring apparatus comprising a laser diode for emitting short light pulses, an emitting lightguide directing said emitted light pulses toward a target, a lens disposed intermediate said emitting lightguide and a said target, a receiving lightguide receiving said light pulses reflected by a said target, a photodiode converting said received light pulses to electric pulse signals, a time comparator to which said electric pulse signals are fed, a clock generator having gate signals controlled by said time comparator and emitting clock pulses, and a counter to which said clock pulses are gated; the improvement in which said emitting and receiving lightguides terminate in distal ends disposed approximately at the focal point of said lens, and a double face reflecting means extends along the optical axis of said lens from adjacent said distal ends of said emitting and receiving lightguides to said lens, whereby a single said lens is effective to focus both said emitted and said received light pulses, without interference therebetween.
Claim 3
Dependent Claim
35 words
Optoelectric distance measuring apparatus according to claim 1, wherein said double face reflecting means is a total-reflecting mirror in the form of two glass prisms (30), between which latter an air gap (31) is provided.
Claim 4
Dependent Claim
34 words
Optoelectric distance measuring apparatus according to claim 1, wherein said emitting lightguide (8) comprises a precursor lightguide (6) for coupling of electromagnetic wave modes in said emitting lightguide, comprised by said emitted light pulses.
Claim 5
Dependent Claim
44 words
Optoelectric distance measuring apparatus according to claim 1, wherein said optical coupler (7, 11) is arranged in each of said emitting and receiving lightguides, said optical couplers being interconnected by a reference lightguide for the formation of a short light path for reference signals.
Claim 6
Dependent Claim
45 words
Optoelectric distance measuring apparatus according to claim 4, characterized in that an optical attenuator (15) is arranged in front of the optical coupler (11) in the receiving lightguide (10), this attenuator being adjustable by means of a sevomotor (16) in accordance with a control program.
Claim 7
Dependent Claim
147 words
An optical measuring probe, for use with an optoelectric distance measuring apparatus having an emitting lightguide and a receiving lightguide, comprising an emitting lightguide extension having a proximate end adapted to be detachable connected to a said emitting lightguide of a said apparatus; a receiving lightguide extension having a proximate end adapted to be detachably connected to a said receiving lightguide of a said apparatus; said emitting and receiving lightguide extensions each terminating in a respective distal end disposed within said probe; a lens disposed within said probe intermediate said respective distal ends and a target whose distance from said probe is to be measured, said distal ends being disposed approximately at the focal point of said lens; and a double face reflecting means extending along the optical axis of said lens from said respective distal ends of said emitting and receiving lightguide extensions to said lens.
Claim 8
Dependent Claim
147 words
An optical measuring probe, for use with an optoelectric distance measuring apparatus having an emitting lightguide and a receiving lightguide, comprising an emitting lightguide extension having a proximate end adapted to be detachable connected to a said emitting lightguide of a said apparatus; a receiving lightguide extension having a proximate end adapted to be detachably connected to a said receiving lightguide of a said apparatus; said emitting and receiving lightguide extensions each terminating in a respective distal end disposed within said probe; a lens disposed within said probe intermediate said respective distal ends and a target whose distance from said probe is to be measured, said distal ends being disposed approximately at the focal point of said lens; and a double face reflecting means extending along the optical axis of said lens from said respective distal ends of said emitting and receiving lightguide extensions to said lens.
Claim 9
Dependent Claim
30 words
Optical measuring probe according to claim 6, wherein said probe further comprises a tubular housing in which said distal ends, said double face reflecting means and said lens are confined.
Claim 10
Dependent Claim
25 words
Optical measuring probe according to claim 7, wherein said tubular housing extends a substantial distance beyond said lens, away from said double face reflecting means.
Claim 11
Dependent Claim
19 words
Optoelectric distance measuring apparatus according to claim 6, wherein said tubular housing (32) is equipped with a lid (34).
Claim 12
Dependent Claim
35 words
Optical measuring probe according to claim 6, wherein said measuring probe (2) is mountable on said apparatus in a gimbal-type manner and is adjustable by means of a servomotor in accordance with a control program.
References Cited (Backward Citations)
US4029391A
Cited
US4249076A
Cited
US4325638A
Cited
US4329017A
Cited
EP0076232A2
Cited
EP0092369A2
Cited
EP0093437A2
Cited
EP0135423A1
Cited
WO1985001117A1
Cited
US4549504A
Cited
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