GB513797A - Improvements in and relating to apparatus for measuring light - Google Patents
Improvements in and relating to apparatus for measuring lightInfo
- Publication number
- GB513797A GB513797A GB1185738A GB1185738A GB513797A GB 513797 A GB513797 A GB 513797A GB 1185738 A GB1185738 A GB 1185738A GB 1185738 A GB1185738 A GB 1185738A GB 513797 A GB513797 A GB 513797A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- optical system
- telescope
- screen
- colour
- 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
- 230000007935 neutral effect Effects 0.000 abstract 3
- 230000003287 optical effect Effects 0.000 abstract 3
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000011022 opal Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0418—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using attenuators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0437—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0488—Optical or mechanical part supplementary adjustable parts with spectral filtering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Eye Examination Apparatus (AREA)
- Telescopes (AREA)
Abstract
513,797. Light-measuring apparatus. BRITISH THOMSON-HOUSTON CO., Ltd., and MAXTED, R. April 20; 1938, No. 11857. [Class 97 (i)] In an instrument for measuring the brightness of an illuminated surface, e.g., a road surface, a comparison spot of light is introduced into the optical system of a telescope so as to be in focus to the eye at the same time as the field of view. Light from a filament 1, is focussed by condensers 2 to -produce an image on an opal screen 6. An iris diaphragm 3, colour filters 4, and neutral filters 5 are employed to vary the brightness of this image. Light from the screen 6 illuminates a similar screen 7, which is then imaged in the plane mirror 8, mounted at 45 degrees to the mutually perpendicular axes of the above optical system and of a telescope 10, so that it may be visible in the eyepiece 9. Other colour and neutral filters may be introduced at will by turning the knobs 13, 12 respectively. The amount of opening of the diaphragm 3 is indicated by a pointer. Additional neutral filters are fitted to each colour filter to make the total absorption the same for each. In a modification, the telescope axis is parallel to that of the optical system, a prism being used to direct the beam on to the mirror 8, which is mounted in a cube of glass for added strength. Specification 454,573 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1185738A GB513797A (en) | 1938-04-20 | 1938-04-20 | Improvements in and relating to apparatus for measuring light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1185738A GB513797A (en) | 1938-04-20 | 1938-04-20 | Improvements in and relating to apparatus for measuring light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB513797A true GB513797A (en) | 1939-10-23 |
Family
ID=9993958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1185738A Expired GB513797A (en) | 1938-04-20 | 1938-04-20 | Improvements in and relating to apparatus for measuring light |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB513797A (en) |
-
1938
- 1938-04-20 GB GB1185738A patent/GB513797A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3405990A (en) | Coaxial illuminator for stereomicroscope | |
| GB1484314A (en) | Chromatic method and apparatus for conducting microscopic examinations at a plurality of magnifications | |
| GB394285A (en) | Improvements in supplementary devices for optical observation instruments | |
| US4274715A (en) | Method and apparatus for the projection of optical test objects | |
| US2553108A (en) | Phase microscopy with reflected light | |
| US2074106A (en) | Metallographic illuminating system and prism therefor | |
| US1934582A (en) | Projection apparatus | |
| US4027942A (en) | Micrometer microscope with binocular viewing | |
| GB513797A (en) | Improvements in and relating to apparatus for measuring light | |
| GB1436037A (en) | Microscope for visual observation and photographic recording | |
| GB591991A (en) | Improvements in or relating to measuring the focal length of lenses | |
| SU1132906A1 (en) | Endoscope | |
| Selwyn | The limit of visual resolution | |
| DE758685C (en) | Eye examination device | |
| GB712113A (en) | Improvements in or relating to sorting apparatus | |
| GB561597A (en) | Improvements in or relating to optical systems | |
| US1522627A (en) | Device for determining the squint deflection | |
| SU1287090A1 (en) | Photocopying apparatus | |
| GB489577A (en) | Improvements in or relating to sight testing or like apparatus | |
| DE1462828A1 (en) | TV camera with color splitting prism system between the lens and the receiving tubes | |
| SU1457895A1 (en) | Apparatus for reveaing anomalies of color vision | |
| GB231848A (en) | Improvements in or relating to the polarisation of light | |
| SU569999A1 (en) | Mirror lens objective | |
| GB387776A (en) | Apparatus for reading a divided circle | |
| CN2491830Y (en) | Double division visual field optical mechanical structure of comparision color grader |