JPS5456884A - Minute light power meter - Google Patents
Minute light power meterInfo
- Publication number
- JPS5456884A JPS5456884A JP12322177A JP12322177A JPS5456884A JP S5456884 A JPS5456884 A JP S5456884A JP 12322177 A JP12322177 A JP 12322177A JP 12322177 A JP12322177 A JP 12322177A JP S5456884 A JPS5456884 A JP S5456884A
- Authority
- JP
- Japan
- Prior art keywords
- output
- light power
- signal
- measuring light
- synchronous detector
- 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
- 230000001360 synchronised effect Effects 0.000 abstract 5
- 238000001514 detection method Methods 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 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
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
PURPOSE:To enable extremely minute light power to be measured as well without any error by making use of the measuring light having been so modulated as to enable the characteristics of a mechanical light chopper and a synchronous detector to be fully exhibited or the a.c. signal so converted therefrom. CONSTITUTION:The reference signal used in a synchronous detector 5 is drawn out from the sigbal under a.c. amplification and it is for this purpose that the output of an a.c. amplifier 71 is branched in two ways. The output having undergone synchronous detection in the synchronous detector 5 by using the signal having no phase difference in this way is invariable in indication value and is effective as a minute light power meter. The purpose of insertion of an amplitude limiter 8 lies in taking the feasibility of the use of a d.c. watmeter 6 even if it is a true number display into consideration. Namely, as the measuring light becomes smaller, the output voltage becomes smaller in proportion to the square of the reduction in the measuring light. Hence, in the case of true number display, the synchronous detection output proportional to the input signal may be obtained by passing the same through the amplitude limiter of a wide dynamic range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12322177A JPS5456884A (en) | 1977-10-14 | 1977-10-14 | Minute light power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12322177A JPS5456884A (en) | 1977-10-14 | 1977-10-14 | Minute light power meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5456884A true JPS5456884A (en) | 1979-05-08 |
Family
ID=14855190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12322177A Pending JPS5456884A (en) | 1977-10-14 | 1977-10-14 | Minute light power meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5456884A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014085301A (en) * | 2012-10-26 | 2014-05-12 | Nippon Telegr & Teleph Corp <Ntt> | Light intensity measurement device for wavelength sweeping light source |
-
1977
- 1977-10-14 JP JP12322177A patent/JPS5456884A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014085301A (en) * | 2012-10-26 | 2014-05-12 | Nippon Telegr & Teleph Corp <Ntt> | Light intensity measurement device for wavelength sweeping light source |
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