GB1432613A - Fluorescence spectrophotometer - Google Patents
Fluorescence spectrophotometerInfo
- Publication number
- GB1432613A GB1432613A GB1684573A GB1684573A GB1432613A GB 1432613 A GB1432613 A GB 1432613A GB 1684573 A GB1684573 A GB 1684573A GB 1684573 A GB1684573 A GB 1684573A GB 1432613 A GB1432613 A GB 1432613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detector
- monochromator
- chopper
- specimen
- passes
- 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
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 abstract 2
- 238000000295 emission spectrum Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 229940043267 rhodamine b Drugs 0.000 abstract 1
- 239000002904 solvent 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4406—Fluorescence spectrometry
Abstract
1432613 Fluorescence spectrometers HITACHI Ltd 9 April 1973 16845/73 Heading G1A A fluorescence spectrophotometer comprises in series a light source, a first monochromator, a specimen under test, a second monochromator and a single photo-detector; the light is chopped after the first monochromator to give two beams, one of which passes to the sample and thence to the second monochromator while the other beam forms a reference which by-passes the sample and the second monochromator. This allows variations in light output to be eliminated. In Fig. 2, light from the source 30 is directed through the first monochromator 33 to a rotating disc chopper having alternate transmissive, opaque, reflective and opaque sections, Fig. 3 (not shown). Light transmitted through the chopper is directed to fluorescent specimen 40 and thence to the second monochromator 42 and detector 49. Light reflected from the chopper passes via mirrors 52, 53 to the detector. As the chopper rotates, the photo-detector 49 produces in sequence a zero level when an opaque section is in the beam path, a reference level when the reflective section is present, a further zero level when the second opaque section is present, and a specimen level when the transmissive level is present. Fig. 5 shows the circuit connected to the detector. Switches 61-1 to 61-3 are operated in turn as the chopper rotates;.when the first opaque region is present the switch 61-3 is closed and the other two are open so that the signal from detector 49 passes through preamp 60 to the zero level hold circuit 74 where it is held. Next the transmissive section of the chopper is present so switch 61-2 is closed and the other two are open. With switches 64, 65, 69 in the positions shown the detector signal passes through preamp 60, reference hold circuit 68, and switch 69 to differential amp 70 where it is compared with standard cell 72. The output of amp 70 controls a high voltage source 73 to change the characteristics of the detector 49, which is a photomultiplier. In this manner the detector output is always the same for the beam reflected by the chopper and the dependance of the detector output on wavelength is removed. Next the zero signal is re-held as the second opaque section occurs, and finally when the transmissive section is present the switch 61-1 closes to pass the detector signal to amp 63 and thence to output 66. During this last step the detector 49 still receives the high voltage set by the reference beam reflected from the chopper, so that the final output at 66 is in effect a comparison of the specimen and reference beams. Using the circuit of Fig. 5 as above, another comparison can be made by placing a photon meter cpmprising a high concentration of Rhodamine B at 81 in Fig. 2 and a filter which passes only Rhodamine fluorescence at 82; in this manner the emission spectra of the specimen and the photon meter are compared in wavelength. By changing switches 64 and 69 to their other positions in Fig. 5, a subtraction measurement is possible; using a specimen at 40 and at 81, a filter is placed at 82 to pass only one wavelength while the second monochromator passes a different wavelength, so that the output of the specimen at two wavelengths are compared and the background due to the solvent removed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1684573A GB1432613A (en) | 1973-04-09 | 1973-04-09 | Fluorescence spectrophotometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1684573A GB1432613A (en) | 1973-04-09 | 1973-04-09 | Fluorescence spectrophotometer |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1432613A true GB1432613A (en) | 1976-04-22 |
Family
ID=10084727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1684573A Expired GB1432613A (en) | 1973-04-09 | 1973-04-09 | Fluorescence spectrophotometer |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1432613A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10151633B2 (en) | 2017-02-09 | 2018-12-11 | Savannah River Nuclear Solutions, Llc | High accuracy absorbance spectrophotometers |
-
1973
- 1973-04-09 GB GB1684573A patent/GB1432613A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10151633B2 (en) | 2017-02-09 | 2018-12-11 | Savannah River Nuclear Solutions, Llc | High accuracy absorbance spectrophotometers |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4945250A (en) | Optical read head for immunoassay instrument | |
US2474098A (en) | Photometric measurement of light values using automatic gain control in photomultiplier tubes | |
EP0438550B1 (en) | Optical read system | |
US3832555A (en) | Fluorescence spectrophotometer | |
US3886363A (en) | Spectro fluorescence and absorption measuring instrument | |
US3924950A (en) | Atomic absorption spectroscopy with background correction | |
US4105333A (en) | Method of identifying fluorescent materials | |
Sullivan et al. | The application of resonance lamps as monochromators in atomic absorption spectroscopy | |
GB1131852A (en) | Improved integrating sphere colorimeter | |
JPS626142A (en) | Photometer for nephelometrically measuring absorbancy, turbidity and fluorescent property | |
US3689158A (en) | Atomic absorption analyzer compensated for background absorption | |
Chance | [29] Principles of differential spectrophotometry with special reference to the dual wavelength method | |
JPH052931B2 (en) | ||
US3540825A (en) | Double beam spectrometer readout system | |
Bøtter-Jensen et al. | A compact design for monochromatic OSL measurements in the wavelength range 380–1020 nm | |
GB1432613A (en) | Fluorescence spectrophotometer | |
GB2070765A (en) | Spectrophotometry | |
US3730629A (en) | Time resolved spectrometer | |
Taylor et al. | Light intensity measurements II: luminescent quantum counter comparator and evaluation of some luminescent quantum counters | |
GB1237547A (en) | Differential spectral absorption analyser | |
US3161769A (en) | Ultraviolet spectrometer with means to change the length of the optical path in the fluent material | |
US3653772A (en) | Two lamp light comparison type densitometer | |
JP2000304694A (en) | Method and apparatus for grading of tea leaf | |
US4035086A (en) | Multi-channel analyzer for liquid chromatographic separations | |
US3588257A (en) | Flame photometric method and apparatus for quantitatively analyzing material specimens |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |