EP0053790A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fiber optical sensor system, preferably for measuring physical parameters
Assignee: Siemens AG
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Filing: 1981-12-01
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Granted: —
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Expires: 2001-12-01
Abstract
Abstract The system contains a fiber optical transmission line (6), a first light source (10) for emitting a first light beam into a first end of the transmission line (6), and at least one first light sensitive element (46) for receiving light from a second end of the transmission line (6). An energy storage device (56) such as a capacitor is connected to the first light sensitive element (46) for energizing various components. The system further contains a second light source (82) for emitting a second light beam into the second end of the transmission line (6). This source (82) is controlled in dependence upon information to be transmitted, preferably in dependence of a physical parameter (p1,p2,p3,p4). The system finally contains a second receiver element (90) for receiving light from the first end of the transmission line (6). This element generates an electric output signal which is in accordance with the transmitted information. The system preferably has a large number of transducer units (60) or measuring elements associated with various second ends of the transmission line (6) for transmitting information of various nature and/or from various locations.
Inventors
- 👤 Georg H. Dr. Sichling
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 23:47
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/026; H04B10/00; H04B10/80; H04B10/806; H04B10/807; B; B60; B60R; B60R16/00; B60R16/02; B60R16/03; B60R16/0315
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
236 words
A fiber optical sensor system for transmission of information from one location to another, comprising in combination: a) a fiber optical transmission line having a first end and at least one second end for transmitting light therebetween, b) a first light source (10) for emitting a first light beam into said first end of said trans- mission line (6); c) at least one first receiver eleme (46) sensi- tive to the light of said first light source (10) for receiving light of said first light source (10) from said second end of said transmission line (6) and for generating a first electric output signal in accordance with the light received; d) electrical energy storaoe means (56) connected to said first receiver elenent (46) for receiving said first electric output signal and for stor- ing energy in accordance therewith: e) a second light source (82) for emitting a second light beam into said second end of said transmission line (6), said second light source (82) being energized from said electrical energy storage means (56) and being controlled in dependence upon information to be transmitted; and f) a second receiver element (90) sensitive to the light of said second light source (82) for receiving light of said second licht source (82) from said transmission line (6) and for generating a second electric output signal in accordance with the light received and thereby in accordance with the transmitted information.
Claim 2
Dependent Claim
236 words
A fiber optical sensor system for transmission of information from one location to another, comprising in combination: a) a fiber optical transmission line having a first end and at least one second end for transmitting light therebetween, b) a first light source (10) for emitting a first light beam into said first end of said trans- mission line (6); c) at least one first receiver eleme (46) sensi- tive to the light of said first light source (10) for receiving light of said first light source (10) from said second end of said transmission line (6) and for generating a first electric output signal in accordance with the light received; d) electrical energy storaoe means (56) connected to said first receiver elenent (46) for receiving said first electric output signal and for stor- ing energy in accordance therewith: e) a second light source (82) for emitting a second light beam into said second end of said transmission line (6), said second light source (82) being energized from said electrical energy storage means (56) and being controlled in dependence upon information to be transmitted; and f) a second receiver element (90) sensitive to the light of said second light source (82) for receiving light of said second licht source (82) from said transmission line (6) and for generating a second electric output signal in accordance with the light received and thereby in accordance with the transmitted information.
Claim 3
Dependent Claim
46 words
2 . The fiber optical sensor system according to claim characterised in that sais first light source (10) is operative to emit repeatedly charge pulses, said charge pulses being received by said first receiving element (46) for supplying said energy storage means (56) with electrical power.
Claim 4
Dependent Claim
33 words
The fiber optical sensor system according to claim 1, characterised by at least one electronic com- ponent in addition to said second light source,(82) connected to be energized from said energy storage means.(56).
Claim 5
Dependent Claim
57 words
4 . The fiber optical sensor system according to claim 1, characterised in that said energy storage means (56) comprises a storage capacitor connected to said first receiver element (46) for deriving electrical charges from said first re- ceiving element (46) and tor storing said charges when said first light source (10) emits said first light beam.
Claim 6
Dependent Claim
28 words
The fiber optical sensor system according to claim 4, characterised in that (48) a diode is connected between said storage capacitor and said first receiver element (46) ,
Claim 7
Dependent Claim
52 words
The fiber optical sensor system according to claim 1 , characterised by a transducer unit (60) containing a sensor element for receiving said information to be transmitted and for supplying an electric sensor output signal in accordance therewith, said transducer unit (60) be-ing connected to and controlling said second light source (82).
Claim 8
Dependent Claim
27 words
The fiber optical sensor system according to claim 1, characterised in that said information to be transmitted is information about a physical parameter (p1-p4) to be measured.
Claim 9
Dependent Claim
42 words
The fiber optical sensor system according to claim 7, characterised in that said transducer unit (60) comprises an RC combination containing a resistor and a capacitor, the time constant of said RC combination being dependent on said physical parameter to be measured.
Claim 10
Dependent Claim
174 words
The fiber optical sensor system according to claim 8, characterised in that said transducer unit (60) urther comprises: 1) meansfor changing the charge of said capacitor (64) in accordance with said time constant, saidmeans being actuated by an initiation signal (i) issued at a first point of time; 2) means (78) or sensing the voltage of said capacitor (64) and for determining a second point of time, said second point of time being the point of time when said capacitor voltage has reached a predetermined value; and 3) means for actuating said second light source (82), said second light source (82) emitting a light pulse when said capacitor voltage has reached said predetermined value and said light pulse being transmitted from said second end to said first end of said optical transmission line: and wherein said fiber optical sensor system further comprises: means connected to said second receiver element for.measuring the difference between said first and said second point of time, said time difference being a function of said physical- parameter to be measured.
Claim 11
Dependent Claim
45 words
The fiber optical sensor system according to claim 9, characterised in that said means for changing the charge of said capacitor (64) of said RC combination comprises a volt- age source for charging said capacitor (64) through said re- sistor (62) of said RC combination.
Claim 12
Dependent Claim
30 words
The fiber optical sensor system according to claim 10, characterised in that said means for changing the charge of said capacitor (64) additionally comprises means for discharging said capacitor (64).
Claim 13
Dependent Claim
70 words
The fiber optical sensor system according to claim 8, characterised in that said transducer unit (60) contains said re- sistor (62) and said capacitor in a series connection, wherein said series connection is coupled to a supply voltage source through first switching means (70), wherein source through first switching means, and wherein control means are provided for controlling said first switching means (70) in dependence on an initiation signal (i).
Claim 14
Dependent Claim
29 words
The fiber optical sensor system according to claim 8, characterised in that (62) said resistor in said RC combination has a resistance which is dependent on said physical parameter.
Claim 15
Dependent Claim
30 words
14 The fiber optical sensor system according to claim 8, characterised in that said capacitor (64) in said RC combination has a capacitance which is dependent on said physical parameter.
Claim 16
Dependent Claim
27 words
The fiber optical sensor system according to claim 10, characterised in that said voltage source for charging said capacitor (64) is formed by said energy storage means(56).
Claim 17
Dependent Claim
22 words
The fiber optical sensor system according to claim 1, characterised in that least one of said receiver elements is a photo diode.
Claim 18
Dependent Claim
24 words
The fiber optical sensor system according to claim 1, characterised in that at least one of said light sources is a light emitting diode.
Claim 19
Dependent Claim
50 words
The fiber optical sensor system according to claim 11, characterised in that said means for changing the charge of said capacitor (64) comprises a first voltage source of a predetermined polarity for charging said capacitor (64) and a second voltage source of reverse polarity for subsequently discharging said capacitor (64).
Claim 20
Dependent Claim
57 words
The fiber optical sensor system according to claim 18, characterised in that two resistors (66, 68) are connected across a supply voltage source to form a voltage divider, and wherein one of said resistors is connected to form said first voltage source and the other one of said resistors is connected to form said second voltage source.
Claim 21
Dependent Claim
31 words
The fiber optical sensor system according to claim 18, characterised in that second switch means (74) are connected between said second voltage source and said capacitor (64) of said RC combination.
Claim 22
Dependent Claim
53 words
21 The fiber optical sensor system according to claim 20, characterised in that a delay member (76) is provided for con- trollinc said second switch means (74) such as to apply said voltage of reverse polarity to said capacitor (64) at a predetermined period of time after said initiating signal (i) was issued.
Claim 23
Dependent Claim
62 words
The fiber optical sensor system according to claim 1, characterised in that said energy storage means (56) is connected to said second light source (82) through third switch means (84), whereby said energy storage means (56) supplies said second light source with electric energy for emission of said second light beam when said third switch means (84) is in an ON position.
Claim 24
Dependent Claim
77 words
The fiber optical sensor system according to claim 9, characterised in that said eneroy storage means (56) is connected to said second light source (82) through third switch means (84), whereby said energy storage means (56) supplies said second light source (82) with electric energy for emission of said second light beam when said third switch means (84) is in an ON position, and wherein said third switch means(84) is actuated by said voltage sensing means (78).
Claim 25
Dependent Claim
32 words
The fiber optical sensor system according to claim 1, characterised by output means for delivering an output signal in dependence on said time difference and thereby in dependence on said physical parameter.
Claim 26
Dependent Claim
116 words
The fiber optical sensor system according to claim 1, characterised in that an encoder (88) is provided for controlling said first light source (10) as to emit a series of coded light pulse patterns, wherein a plurality of receiver elements (46) is optically connected to said fiber optical transmission line, (6) wherein an individual decoder (72) is con- nected to each of said receiver elements (46), whereby a predetermined and individualized pulse pattern is associated with each individual decoder (72) each of said decooers (72) de- coding said coded pulse patterns and issuing an initiation signal (i) to said means for changing the charge when the coded pulse pattern received equals its predetermined and individualized pattern.
Claim 27
Dependent Claim
47 words
The fiber optical sensor system according to claim 25, characterised in that said encoder(88) is connected to control said first light source (10) such that at first a storage pulse and subsequently said series of coded light pulse patterns are emitted from said first light source (10).
Claim 28
Dependent Claim
32 words
The fiber optical sensor system according to claim 1, characterised in that least said first receiver element (46) and said second light source (82) are arranged in a metal housing .(120) .
Claim 29
Dependent Claim
25 words
The fiber optical sensor system according to claim 27, characterised in that said second light source (82) is mounted on said first receiver element (46).
Claim 30
Dependent Claim
31 words
The fiber optical sensor system according to claim 1, characterised in that said second receiver element (90) is arranged for receiving light from said first end of said transmission line (6).
Claim 31
Dependent Claim
45 words
The fiber optical sensor system according to claim 1, characterised in that said transducer unit (60) is connected to transform said information into a corresponding electrical quantity, and wherein said second light source (82) is connected to transform said electrical quantity into an optical quantity.
Claim 32
Dependent Claim
51 words
The fiber optical sensor system according to claim 1, characterised by a pulse width modulator (132) connected between said sensor (130) and said second light source(82) for supplying control pulses for controlling said second light source (82), the width of said control pulses being determined by said information to be transmitted.
Claim 33
Dependent Claim
24 words
The fiber optical sensor system according toclaim 1,characterised in that said transducer unit (60) is determined to measure a physical parameter in an automobile.
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