JPS5726719A - Measuring circuit for light output of light emitting element - Google Patents
Measuring circuit for light output of light emitting elementInfo
- Publication number
- JPS5726719A JPS5726719A JP10149480A JP10149480A JPS5726719A JP S5726719 A JPS5726719 A JP S5726719A JP 10149480 A JP10149480 A JP 10149480A JP 10149480 A JP10149480 A JP 10149480A JP S5726719 A JPS5726719 A JP S5726719A
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting element
- light emitting
- photodetector
- converted
- 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.)
- Pending
Links
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 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
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
Abstract
PURPOSE:To make the execution of stable and accurate measurement of the light output of a light emitting element over a long period of time possible by automatically correcting the degradation and drift of a photodetector itself by using a reference light source. CONSTITUTION:The beams of light of a light emitting element and a reference light sources emitted by constant current sources are conducted respectively to light guides, and either of these is selected with a photoswitch. After it is photoelectrically converted and amplified, it is converted to a digital signal. At this time, the drift quantity owing to the deterioration and temp. change of a photodetector is measured, and the light output of said light emitting element is automatically corrected by way of an automatic calibrating circuit. For example, the beams of light of a light emitting element 10 and a reference light source 11 emitting by constant electric current circuits 8, 9 are conducted to guides 12 and 13, and are converted to electric signals by a photodetector 15 via a photoswitch 14. After these signals are amplified, they are digitized. At this time, the sensitivity of the photodetector is automatically corrected by using an automatic calibrating circuit 18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10149480A JPS5726719A (en) | 1980-07-24 | 1980-07-24 | Measuring circuit for light output of light emitting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10149480A JPS5726719A (en) | 1980-07-24 | 1980-07-24 | Measuring circuit for light output of light emitting element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5726719A true JPS5726719A (en) | 1982-02-12 |
Family
ID=14302209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10149480A Pending JPS5726719A (en) | 1980-07-24 | 1980-07-24 | Measuring circuit for light output of light emitting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5726719A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288389A (en) * | 2011-05-11 | 2011-12-21 | 杭州远方光电信息股份有限公司 | Light source aging test measuring device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5396883A (en) * | 1977-02-02 | 1978-08-24 | Ritsuo Hasumi | Laser ray output meter with sensibility correcting function |
| JPS53140082A (en) * | 1977-05-13 | 1978-12-06 | Tokyo Optical | Rotary disc type light chopper |
-
1980
- 1980-07-24 JP JP10149480A patent/JPS5726719A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5396883A (en) * | 1977-02-02 | 1978-08-24 | Ritsuo Hasumi | Laser ray output meter with sensibility correcting function |
| JPS53140082A (en) * | 1977-05-13 | 1978-12-06 | Tokyo Optical | Rotary disc type light chopper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288389A (en) * | 2011-05-11 | 2011-12-21 | 杭州远方光电信息股份有限公司 | Light source aging test measuring device |
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