CH297676A - Installation for the photoelectric measurement of the position of a line of a graduation. - Google Patents
Installation for the photoelectric measurement of the position of a line of a graduation.Info
- Publication number
- CH297676A CH297676A CH297676DA CH297676A CH 297676 A CH297676 A CH 297676A CH 297676D A CH297676D A CH 297676DA CH 297676 A CH297676 A CH 297676A
- Authority
- CH
- Switzerland
- Prior art keywords
- line
- light
- installation
- cell
- rays reflected
- Prior art date
Links
- 238000009434 installation Methods 0.000 title claims description 7
- 238000005259 measurement Methods 0.000 title claims description 4
- 230000003287 optical effect Effects 0.000 claims description 8
- 230000010355 oscillation Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000000737 periodic 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
- G01D5/36—Forming the light into pulses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
- B23B39/04—Co-ordinate boring or drilling machines; Machines for making holes without previous marking
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/04—Regulation of the inter-electrode distance
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/02—Rulers with scales or marks for direct reading
-
- 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
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
Installation pour la mesure, par voie photoélectrique, de la position d'un trait d'une graduation. La présente invention a pour objet une installation pour la mesure, par voie photo électrique, de la.
position d'un trait d'une gra duation, comprenant une source de lumière dont émane un faisceau éclairant qui, au moyen d'un objectif de projection, forme une image de la source sur la surface graduée, un déflecteur à oscillations entretenues placé sur l'axe optique de l'installation, de manière à imprimer au rayon lumineux un mouvement d'oscillations produisant un balayage, une cel lule photoélectrique sensible au contraste entre l'intensité des rayons réfléchis par le trait. dont la position est. à mesurer et celle des rayons réfléchis par la surface avoisinante du trait, la cellule agissant. sur un appareil lage de mesure sensible au temps qui s'écoule entre les impulsions électriques émises succes sivement. par la cellule photoélectrique.
Cette installation est caractérisée par le fait que la source lumineuse est telle qu'elle produit sur la surface de la règle une plage lumineuse plus large que les traits de la règle et que le déflecteur optique oscillant est placé entre l'objectif et la cellule photoélectrique, de manière à imprimer un mouvement d'oscil lations aux rayons lumineux réfléchis par la règle, un diaphragme à fente linéaire étant en outre disposé devant. la cellule.
Le dessin annexé représente, à titre d'exemple, une forme d'exécution de l'objet de l'invention. La figure est un schéma d'ensemble de cette forme d'exécution.
Dans cette figure, 51 désigne une source lumineuse quelconque dont la lumière est pro jetée sur la règle par l'intermédiaire d'un miroir semi-transparent 52 et d'un objectif 24. Les rayons lumineux émanant de 51 forment sur la surface polie 30 de la. règle une plage brillante S plus large que les traits 8, Sa, 8b de la graduation de la. règle.
La. lumière réfléchie par la règle est. pro jetée par l'objectif 24, d'une part, sur le réti cule d'un oculaire d'observation 36 par l'in termédiaire d'un second miroir semi-transpa- rent 53 et, d'autre part, sur un écran opaque 50 perpendiculaire à l'axe optique 0-0 et masquant la cellule photoélectrique 31. Cet écran présente une fente 49 très étroite, pa rallèle aux traits de la règle et dont. l'axe passe par l'axe optique 0-0.
Les traits 8, 8a, 8b de la règle constituent des accidents sur la surface polie de la règle: dans l'exemple représenté, c'est le trait Sa qui se trouve dans le champ éclairé S et. forme une image sombre sur le réticule de l'oculaire 36 et sur l'écran 50.
Un déflecteur optique oscillant. 25 est placé entre l'objectif 24 et l'écran 50. Il inter cepte les rayons réfléchis par la plage bril lante de la règle et qui forment sur l'écran 50 l'image de cette plage, avec un trait som bre 8c, l'image du trait 8a de la graduation. Ces rayons réfléchis sont ainsi soumis à une déviation périodique produisant sur l'écran 50 un balayage de ladite image, centré sur l'axe optique et sur la. fente 49.
La largeur de la plage éclairée S et l'am plitude du balayage sont telles que la fente 49 reste constamment dans la plage éclairée <B><I>Si.</I></B> A chaque coïncidence de l'image 8c avec la fente -I9, la quantité de lumière atteignant la cellule photo-électrique subit une brusque variation qui se traduit par l'émission d'une impulsion électrique agissant sur l'appareil de lecture, dans les mêmes conditions que celles décrites dans le brevet. principal.
Installation for the photoelectric measurement of the position of a line of a graduation. The present invention relates to an installation for the measurement, by photoelectric means, of the.
position of a line of a gra duation comprising a light source from which emanates an illuminating beam which, by means of a projection lens, forms an image of the source on the graduated surface, a continuously oscillating deflector placed on the optical axis of the installation, so as to impart to the light ray an oscillating movement producing a scanning, a photoelectric cell sensitive to the contrast between the intensity of the rays reflected by the line. whose position is. to be measured and that of the rays reflected by the neighboring surface of the line, the cell acting. on a measuring device sensitive to the time which elapses between the successively emitted electrical pulses. by the photocell.
This installation is characterized by the fact that the light source is such that it produces on the surface of the rule a light range wider than the lines of the rule and that the oscillating optical deflector is placed between the objective and the photoelectric cell , so as to impart an oscillating movement to the light rays reflected by the rule, a linear slit diaphragm being furthermore arranged in front. the cell.
The appended drawing represents, by way of example, an embodiment of the object of the invention. The figure is a general diagram of this embodiment.
In this figure, 51 designates any light source, the light of which is projected onto the ruler via a semi-transparent mirror 52 and an objective 24. The light rays emanating from 51 form on the polished surface 30 of the. sets a bright range S wider than the lines 8, Sa, 8b of the graduation of the. rule.
The light reflected by the ruler is. projected by the objective 24, on the one hand, onto the reticle of an observation eyepiece 36 via a second semi-transparent mirror 53 and, on the other hand, onto a opaque screen 50 perpendicular to the optical axis 0-0 and masking the photoelectric cell 31. This screen has a very narrow slit 49, parallel to the lines of the rule and of which. the axis passes through the optical axis 0-0.
The lines 8, 8a, 8b of the ruler constitute accidents on the polished surface of the ruler: in the example shown, it is the line Sa which is in the illuminated field S and. forms a dark image on the eyepiece reticle 36 and on the screen 50.
An oscillating optical deflector. 25 is placed between the objective 24 and the screen 50. It intercepts the rays reflected by the shining area of the ruler and which form on the screen 50 the image of this area, with a dark line 8c, the image of line 8a of the graduation. These reflected rays are thus subjected to a periodic deflection producing on the screen 50 a scan of said image, centered on the optical axis and on the. slot 49.
The width of the illuminated area S and the amplitude of the scanning are such that the slit 49 remains constantly within the illuminated area <B><I>Si.</I> </B> At each coincidence of the image 8c with the slit -I9, the quantity of light reaching the photoelectric cell undergoes a sudden variation which results in the emission of an electrical impulse acting on the reading device, under the same conditions as those described in the patent . main.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH297676T | 1952-01-18 | ||
CH281171T | 1952-01-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH297676A true CH297676A (en) | 1954-03-31 |
Family
ID=25732083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH297676D CH297676A (en) | 1952-01-18 | 1952-01-18 | Installation for the photoelectric measurement of the position of a line of a graduation. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH297676A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1135182B (en) * | 1957-10-31 | 1962-08-23 | Zeiss Carl Fa | Method and device for the non-contact determination of the dimensions of objects from a nominal dimension |
EP0061334A1 (en) * | 1981-03-23 | 1982-09-29 | The Babcock & Wilcox Company | Liquid level gauge assemblies for providing remote and local displays of liquid level |
EP0061920A1 (en) * | 1981-03-31 | 1982-10-06 | The Babcock & Wilcox Company | Methods of aligning optical liquid level indicators |
-
1952
- 1952-01-18 CH CH297676D patent/CH297676A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1135182B (en) * | 1957-10-31 | 1962-08-23 | Zeiss Carl Fa | Method and device for the non-contact determination of the dimensions of objects from a nominal dimension |
EP0061334A1 (en) * | 1981-03-23 | 1982-09-29 | The Babcock & Wilcox Company | Liquid level gauge assemblies for providing remote and local displays of liquid level |
EP0061920A1 (en) * | 1981-03-31 | 1982-10-06 | The Babcock & Wilcox Company | Methods of aligning optical liquid level indicators |
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