GB772250A - Spectral analysis by electrical light-sensitive means - Google Patents
Spectral analysis by electrical light-sensitive meansInfo
- Publication number
- GB772250A GB772250A GB3235553A GB3235553A GB772250A GB 772250 A GB772250 A GB 772250A GB 3235553 A GB3235553 A GB 3235553A GB 3235553 A GB3235553 A GB 3235553A GB 772250 A GB772250 A GB 772250A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- integrator
- miller
- cell
- fed
- 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
- 238000010183 spectrum analysis Methods 0.000 title abstract 2
- 230000003595 spectral effect Effects 0.000 abstract 4
- 238000004458 analytical method Methods 0.000 abstract 1
- 238000001228 spectrum 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/32—Investigating bands of a spectrum in sequence by a single detector
-
- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
Abstract
772,250. Photo-electric spectrum analyses. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Nov. 15, 1954 [Nov. 21, 1953], No. 32355/53. Class 40 (3). [Also in Group XL (c)] In spectral analysis in which a light-sensitive cell receives light which is characteristic of the element of interest unwanted signals due to the spectral background are eliminated by means of a second cell receiving light from an adjacent nearby area of the spectral background, the difference between the two cell outputs being measured. As shown, a diaphragm 2 arranged in the focal plane of a spectrograph 4 carries two slits so arranged that photo-cell 6 behind one slit receives light from the spectral line under consideration while cell 8 receives light from nearby spectral background. The outputs of the two cells are integrated at 10 and 12, the output of integrator 12 being adjustable by potentiometer 14. The difference between the two signals is amplified and shown on an inductor 18. A number of cells may be connected in turn to the integrator by a switch while the output of the integrator 12 is connected to a number of output potentiometers 14. In the arrangement of Fig. 3 (not shown), appropriate wavebands are selected by means of filters while the integrators are of the Miller type. Circuits. In the arrangement of Fig. 2 the output of photo-multiplier 8 is integrated across condenser C1 and fed to the grid of valve V1 forming with V2 a long-tailed pair. The output of these valves is fed to an amplifier V3 and balancing valve V4, while the output of V3 is fed to a cathode follower V5 which provides 100 per cent negative feedback to the grid of V2 producing a low output impedance. In the circuit of Fig. 4, for use with the arrangement of Fig. 3, referred to above, the output of a pair of Miller integrators each fed from one of photomultipliers 6, 8 is compared. Each integrator consists of the Miller integrator valve V10, inphase amplifier V11, cathode follower V12, and Miller condenser C10 connected between the cathode of the cathode follower and the grid of the Miller valve. Specification 661,497 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3235553A GB772250A (en) | 1953-11-21 | 1953-11-21 | Spectral analysis by electrical light-sensitive means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3235553A GB772250A (en) | 1953-11-21 | 1953-11-21 | Spectral analysis by electrical light-sensitive means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB772250A true GB772250A (en) | 1957-04-10 |
Family
ID=10337343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3235553A Expired GB772250A (en) | 1953-11-21 | 1953-11-21 | Spectral analysis by electrical light-sensitive means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB772250A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4645342A (en) * | 1984-10-05 | 1987-02-24 | Kawasaki Steel Corp. | Method of laser emission spectroscopic analysis of steel and apparatus therefor |
-
1953
- 1953-11-21 GB GB3235553A patent/GB772250A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4645342A (en) * | 1984-10-05 | 1987-02-24 | Kawasaki Steel Corp. | Method of laser emission spectroscopic analysis of steel and apparatus therefor |
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