GB783524A - Means for measuring and/or recording the air gap between the parts of a machine - Google Patents
Means for measuring and/or recording the air gap between the parts of a machineInfo
- Publication number
- GB783524A GB783524A GB1510154A GB1510154A GB783524A GB 783524 A GB783524 A GB 783524A GB 1510154 A GB1510154 A GB 1510154A GB 1510154 A GB1510154 A GB 1510154A GB 783524 A GB783524 A GB 783524A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- width
- air gap
- image
- cell
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
783,524. Photo-electric apparatus. SIEMENS-SCHUCKERTWERKE AKT.-GES. May 21, 1954, No. 15101/54. Class 40 (3). [Also in Group XXXVIII] Apparatus for measuring the width of an air gap between parts of a machine comprises means for projecting radiation through the gap to form an optical image thereof, means for scanning the image along the width dimension and for generating an electric signal dependent on the duration of a scan, a parameter of which signal depends on the width of the air gap but is independent of the radiation intensity, and means for measuring either the value of said parameter or of some parameter of an electrical output from a converting arrangement to which the signal is applied. The air gap (Fig. 1) is illuminated by a beam of light formed by lens 5 and a image of the gap is projected by lens 7 and prism 8 on to a disc 12 provided with a radial slit or equal width slits, which is rotated at constant speed in front of photo-cell 10, the periods of illumination of which are therefore dependent on the width of the image. The output pulses from the cell which vary in amplitude due to non-uniformity of the image forming beam or to variation in the light source intensity and absorption of the light path, are applied to the input of a non-linear network, such as a thermionic valve amplifier driven to saturation by the pulses, so that its output consists of a series of voltage pulses of constant amplitude but of the same duration as the pulses from the photo-cell. Alternatively the pulses from the cell are fed to a non-linear network consisting of reverse-connected rectifiers in parallel. These voltage pulses are averaged at 17 (e.g. by an R.C. network) and the average voltage which is proportional to air gap width is indicated by meter 18. The saturated amplifier may be replaced by a relay operated by output pulses from the photo-cell to connect an R.C. averaging network periodically to a D.C. source, the mean condenser voltage representing the air gap width. In a further embodiment a modulated radiation source is used, the modulation frequency being much higher than the rotation frequency of the disc, to which it is preferably locked, so that the air gap image is periodically illuminated. The relative frequencies are suchthat during passage of the slit across the image the latter is illuminated a number of times proportional to the width of the inage and the number of consequent pulses from the photocell is counted, preferably by an electronic counter of the decade type driven directly by the photo-cell output. Alternatively as in the first embodiment the pulses may be used to produce further constant amplitude pulses, this time of uniform duration, which are integrated to give an output voltage proportional to the number thereof. The radiation used may be light as described, or penetrating radiation such as γ-rays, e.g. from isotope radiators, in which case no windows in the turbine or other machine casing would be necessary, appropriate image forming and radiation directing and detecting means replacing the prisms and lenses used with light.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1510154A GB783524A (en) | 1954-05-21 | 1954-05-21 | Means for measuring and/or recording the air gap between the parts of a machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1510154A GB783524A (en) | 1954-05-21 | 1954-05-21 | Means for measuring and/or recording the air gap between the parts of a machine |
Publications (1)
Publication Number | Publication Date |
---|---|
GB783524A true GB783524A (en) | 1957-09-25 |
Family
ID=10053056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1510154A Expired GB783524A (en) | 1954-05-21 | 1954-05-21 | Means for measuring and/or recording the air gap between the parts of a machine |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB783524A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4021118A (en) * | 1975-04-10 | 1977-05-03 | Lkb-Produkter Ab | Method in a microtome for approaching the knife to the specimen |
US4180329A (en) * | 1978-03-23 | 1979-12-25 | The United States Of America As Represented By The Secretary Of The Air Force | Single blade proximity probe |
US4441817A (en) * | 1980-07-29 | 1984-04-10 | Diffracto Ltd. | Electro-optical sensors with fiber optic bundles |
GB2169402A (en) * | 1984-12-19 | 1986-07-09 | Fenner Co Ltd J H | A method and an apparatus for detecting tears in a conveyor belt |
US4666303A (en) * | 1983-07-11 | 1987-05-19 | Diffracto Ltd. | Electro-optical gap and flushness sensors |
US5079432A (en) * | 1990-06-25 | 1992-01-07 | Ampex Corporation | Method and apparatus for measuring the displacement of an automatic scan tracking head |
EP2476995A1 (en) | 2011-01-12 | 2012-07-18 | Canon Kabushiki Kaisha | Apparatus and method for measuring displacement, method of making die for molding optical element, and optical element |
JP2015047650A (en) * | 2013-08-30 | 2015-03-16 | 株式会社ディスコ | Processing device |
ITBO20130687A1 (en) * | 2013-12-13 | 2015-06-14 | Aea Srl | DEVICE AND METHOD TO VERIFY THE CORRECT ASSEMBLY OF A CONNECTION BODY WITH A HEAD, COMPARED TO A MOUNTING SURFACE |
-
1954
- 1954-05-21 GB GB1510154A patent/GB783524A/en not_active Expired
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4021118A (en) * | 1975-04-10 | 1977-05-03 | Lkb-Produkter Ab | Method in a microtome for approaching the knife to the specimen |
US4180329A (en) * | 1978-03-23 | 1979-12-25 | The United States Of America As Represented By The Secretary Of The Air Force | Single blade proximity probe |
US4441817A (en) * | 1980-07-29 | 1984-04-10 | Diffracto Ltd. | Electro-optical sensors with fiber optic bundles |
US4666303A (en) * | 1983-07-11 | 1987-05-19 | Diffracto Ltd. | Electro-optical gap and flushness sensors |
GB2169402A (en) * | 1984-12-19 | 1986-07-09 | Fenner Co Ltd J H | A method and an apparatus for detecting tears in a conveyor belt |
US5079432A (en) * | 1990-06-25 | 1992-01-07 | Ampex Corporation | Method and apparatus for measuring the displacement of an automatic scan tracking head |
EP2476995A1 (en) | 2011-01-12 | 2012-07-18 | Canon Kabushiki Kaisha | Apparatus and method for measuring displacement, method of making die for molding optical element, and optical element |
JP2012159498A (en) * | 2011-01-12 | 2012-08-23 | Canon Inc | Displacement measuring device, displacement measuring method, manufacturing method of molding die for optical element and optical element |
US8559019B2 (en) | 2011-01-12 | 2013-10-15 | Canon Kabushiki Kaisha | Apparatus and method for measuring displacement, method of making die for molding optical element, and optical element |
JP2015047650A (en) * | 2013-08-30 | 2015-03-16 | 株式会社ディスコ | Processing device |
ITBO20130687A1 (en) * | 2013-12-13 | 2015-06-14 | Aea Srl | DEVICE AND METHOD TO VERIFY THE CORRECT ASSEMBLY OF A CONNECTION BODY WITH A HEAD, COMPARED TO A MOUNTING SURFACE |
WO2015087302A1 (en) * | 2013-12-13 | 2015-06-18 | Aea S.R.L. | Device and method for checking the correct fitting of a connection organ having a head, relative to a fitting surface |
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