GB2276719A - Optical angle encoder for gyros - Google Patents
Optical angle encoder for gyros Download PDFInfo
- Publication number
- GB2276719A GB2276719A GB9406147A GB9406147A GB2276719A GB 2276719 A GB2276719 A GB 2276719A GB 9406147 A GB9406147 A GB 9406147A GB 9406147 A GB9406147 A GB 9406147A GB 2276719 A GB2276719 A GB 2276719A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pick
- rotation
- optical
- gyros
- centre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 11
- 238000005096 rolling process Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/34776—Absolute encoders with analogue or digital scales
- G01D5/34792—Absolute encoders with analogue or digital scales with only digital scales or both digital and incremental scales
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/02—Rotary gyroscopes
- G01C19/04—Details
- G01C19/28—Pick-offs, i.e. devices for taking-off an indication of the displacement of the rotor axis
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
- H03M1/28—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding
- H03M1/30—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding incremental
- H03M1/301—Constructional details of parts relevant to the encoding mechanism, e.g. pattern carriers, pattern sensors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Navigation (AREA)
Description
2276719 1 AN OPTICAL PICK-OFF FOR GYROS This invention relates to an
optical pick-off for gyros for non-contact scanning of the pitch and rolling angle at the centre of rotation thereof by means of a 5 reflective light barrier and evaluation electronics.
Such a pick-of f Is known from German Patent Specification No. 3308358 in a special configuration for determination of the course of a vehicle equipped with a gyrocompass with a spherical float. This configuration is essentially based on a very complex and expensive float design, and, as is the case with several other such pick-offs which are known in the prior art - with additional reference to US 44 88 041 and GB 21 76 283 A - , requires at least two photoelectric barriers on the internal frame, the signals from which must generally be decoupled from the rotational movement via a slip ring. In order to assure the required reliability, these configurations - as indicated in Figure 2 - are very expensive on the basis of their design as well as their material, assembly and alignment, and also because of their weight.
The object of the present invention is to propose a design of the aforementioned type of pick-of f, which optimises its reliability and operability while minimising expense with respect to its structural 2 elements and its weight.
This object is achieved in that the measurement of the angle position is decoded incrementally with direction recognition by a trivalent code system, a circular disc being mounted on gimbals for rotation around the rolling axis and the pitch axis of the gyro, said disc comprising, for coding purposes, a full-surf ace circular reflector as well as a similarly circular printed red filter and a circular reflector with etched windows, and said disc being illuminated by an optical unit located on the centre of rotation.
Further features of the invention are given in the subclaims.
A specific embodiment of the invention is explained in 15 the following description and is shown in Fig. 1 of the drawing. In the drawings:
Fig. 1 is a diagram of a non-contact gyro pick-off in accordance with the invention; and Fig. 2 is a perspective view of a configuration of gyro pick-off from the prior art.
The invention will be described using a position gyro as i 1 3 an example. As may be seen from Figure 1, the coding of the gyro pick- off 10 is provided on a circular disc 11 hereafter referred to as code disk - which is mounted on gimbals and moves around both the rolling axis 12 and the pitch axis 13. This code disk 11 comprises a full-surface reflector 14, a printed red filter 15 and a reflector 16 with etched windows. This code disk 11 is illuminated by an optical unit 17 which is located on the axis of rotation, thus enabling a fixed reading of its code 10 irrespective of the rotational position of the code disk.
A trivalent code is used for direction recognition. The three states are:
a white reflection at reflector 16 b) a red reflection at the full-surface reflector 14 through the printed red reflector 15 and the etched windows of the reflector 16 c) no reflection through the black surface on the printed red filter 15 and through the _windows in the reflector 16.
These three states are evaluated by a double photodiode 18, the two photodiodes having a different spectral response, for example, by virtue of a green filter 19 4 placed in the optical path to one of them, as in the illustrated example. The signals from these photodiodes 18 are amplified and appropriately decoded in an electronic unit 20 connected downline.
Three states result once again:
a) a white reflection, in which case both diodes generate signals b) a red reflection, in which case only one diode generates a signal c) no reflection, in which case neither diode generates a signal.
From the sequence of these states, incremental angle data as well as direction data are relayed in decoded state via a simple logic unit. This same system may also be used for rolling pick-off.
Hence, non-contact scanning of the pitch and rolling angle of a position gyro or other path or angle coder is provided in the centre of rotation by means of a reflective light barrier, in which case the measurement of the angle position is provided incrementally with direction recognition by a trivalent code system.
j
Claims (4)
1. An optical pick-off for gyros for non-contact scanning of the pitch and rolling angle at the centre of rotation thereof by means of a reflective light barrier and evaluation electronics, wherein the measurement of the angle position is decoded incrementally with direction recognition by a trivalent code system, a circular disc being mounted on gimbals for rotation around the rolling axis and the pitch axis of the gyro, said disc comprising, for coding purposes, a full-surface circular reflector as well as a similarly circular printed red filter and a circular reflector with etched windows and said disc being illuminated by an optical unit located on the centre of rotation.
2. A pick-off according to Claim 1 wherein the optical unit is composed of a light source, a double photodiode and a colour filter located in the optical path between said source and one diode.
3. A pick-off according to Claim 2, further including an electronic unit connected downline wherein the signals from the photodiodes are amplified, decoded and input to a logic unit for incremental angle data.
4. An optical pick-off for gyros for non-contact 6 scanning of the pitch and rolling angle at the centre of rotation thereof substantially as hereinbefore described with reference to and as illustrated by Fig. 1 of the accompanying drawing.
9
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4310405A DE4310405C1 (en) | 1993-03-31 | 1993-03-31 | Optical tap |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9406147D0 GB9406147D0 (en) | 1994-05-18 |
| GB2276719A true GB2276719A (en) | 1994-10-05 |
| GB2276719B GB2276719B (en) | 1996-09-25 |
Family
ID=6484280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9406147A Expired - Fee Related GB2276719B (en) | 1993-03-31 | 1994-03-29 | An optical pick-off for gyros |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE4310405C1 (en) |
| FR (1) | FR2703452B1 (en) |
| GB (1) | GB2276719B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6359409B1 (en) | 1999-05-19 | 2002-03-19 | Max Stegmann Gmbh Antriebstechnik-Elektronik | Encoder |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19607421A1 (en) * | 1996-02-28 | 1997-09-04 | Kammerer Gmbh M | Unit for detecting actual position of adjusting elements in regulation stretches |
| DE19750474C2 (en) * | 1997-11-14 | 2000-08-10 | Stegmann Max Antriebstech | Encoder |
| CN112304252B (en) * | 2020-10-30 | 2022-03-22 | 维沃移动通信有限公司 | Folding angle determining method, folding equipment and electronic equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2506007A1 (en) * | 1981-05-18 | 1982-11-19 | Telecommunications Sa | DEVICE FOR MEASURING COORDINATES OF A ROTATING SPHERE AND METHOD FOR MANUFACTURING A PART OF SAID DEVICE |
| DE3308358A1 (en) * | 1983-03-09 | 1984-09-13 | Fa. C. Plath, 2000 Hamburg | Method and device for determining the course of vehicles by means of a gyro compass |
| GB8513982D0 (en) * | 1985-06-04 | 1985-07-10 | British Aerospace | Gyroscopes |
-
1993
- 1993-03-31 DE DE4310405A patent/DE4310405C1/en not_active Expired - Fee Related
-
1994
- 1994-03-28 FR FR9403595A patent/FR2703452B1/en not_active Expired - Fee Related
- 1994-03-29 GB GB9406147A patent/GB2276719B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6359409B1 (en) | 1999-05-19 | 2002-03-19 | Max Stegmann Gmbh Antriebstechnik-Elektronik | Encoder |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4310405C1 (en) | 1994-09-08 |
| GB9406147D0 (en) | 1994-05-18 |
| FR2703452B1 (en) | 1995-08-18 |
| GB2276719B (en) | 1996-09-25 |
| FR2703452A1 (en) | 1994-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20000329 |