WO1998041824B1 - Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation source - Google Patents
Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation sourceInfo
- Publication number
- WO1998041824B1 WO1998041824B1 PCT/US1998/004312 US9804312W WO9841824B1 WO 1998041824 B1 WO1998041824 B1 WO 1998041824B1 US 9804312 W US9804312 W US 9804312W WO 9841824 B1 WO9841824 B1 WO 9841824B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radiation
- optical
- probe
- specimen
- source
- Prior art date
Links
- 230000005284 excitation Effects 0.000 title claims 10
- 230000003287 optical Effects 0.000 claims abstract 39
- 239000000523 sample Substances 0.000 claims abstract 33
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract 5
- 230000003750 conditioning Effects 0.000 claims abstract 5
- 239000003365 glass fiber Substances 0.000 claims 11
- 230000002463 transducing Effects 0.000 claims 6
- 239000007788 liquid Substances 0.000 claims 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 3
- 229910052710 silicon Inorganic materials 0.000 claims 3
- 239000010703 silicon Substances 0.000 claims 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 2
- 239000010931 gold Substances 0.000 claims 2
- 229910052737 gold Inorganic materials 0.000 claims 2
- 210000001699 lower leg Anatomy 0.000 claims 2
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract 1
Abstract
A device for detecting elastically scattered radiation comprising: a source (16) of monochromatic radiation having a controllable output, a detector (56) for detecting the elastically scattered radiation from a specimen (12), and a signal conditioning circuit (68) comprising a transducer and comparator. The output of the transducer is compared to a threshold signal to produce a control output signal for source (16). The device is further included in a raman spectrometry apparatus that further includes an optical probe (32). The probe comprises a fluid-tight body that encloses three optical channels, preferabyl comprising fibers that carry monochromatic radiation to the speciment and separately collect inelastically and elastically scattered radiation from the specimen.
Claims
1. A safety device for detecting elastically scattered radiation, said device comprising: a source of substantially monochromatic radiation having a controllable output; detecting means for detecting elastically scattered radiation collected from a specimen illuminated by said source of substantially monochromatic radiation; and a signal conditioning circuit comprising: transducing means comprising a transimpedance amplifier for converting detected elastically scattered radiation collected from the specimen into an output transducer signal representative of said detected elastically scattered radiation; and a comparator for receiving a predefined threshold signal and the output transducer signal, and generating a control output signal coupled to the source of substantially monochromatic radiation, said control output signal being representative of whether said output transducer signal is greater than, equal to, or less than said threshold signal.
2. The safety device of claim 1 wherein the source of substantially monochromatic radiation comprises a laser.
3. The safety device of claim 2 wherein said substantially monochromatic radiation has a wavelength of about 750 nm to 850 nm.
4. The safety device of claim 1 wherein the detecting means comprising a silicon photodetector .
5. The safety device of claim 1 further comprising: latch means responsive to the control output signal from the comparator for reducing the output of the source of substantially monochromatic radiation when the output transducer signal is less than predefined threshold signal .
6. The safety device of claim 5 wherein the latch means comprises a relay.
7. The safety device of claim 6 wherein said latch means further comprises an on/off switch.
8. The safety device of claim 1 wherein the comparator has an adjustable trip point.
9. The safety device of claim 8 wherein the signal conditioning circuit further comprises a buffer amplifier coupled to the transducing means and a reference voltage source coupled to the buffer amplifier, said buffer amplifier being selectively connected to the comparator for generating a test output to adjust the trip point of the comparator.
10. The safety device of claim 1 wherein said specimen is a liquid.
11. An analyzer apparatus provided with a safety device for controlling a source of excitation radiation, said apparatus comprising: an excitation source of substantially monochromatic radiation having a controllable output; an optical probe interfacing the excitation source with a specimen, said optical probe comprising:
2'
a first optical channel for carrying radiation from said excitation source to illuminate the specimen; a second optical channel for collecting radiation elastically scattered by the illuminated specimen, and a third optical channel for collecting radiation inelastically scattered by the illuminated specimen; first detecting means for detecting radiation elastically scattered by the illuminated specimen; second detecting means for detecting radiation inelastically scattered by the illuminated specimen; a signal conditioning circuit comprising: transducing means for converting detected elastically scattered radiation collected from the specimen into an output transducer signal representative of said detected elastically scattered radiation; and a comparator for receiving a predefined threshold signal and the output transducer signal, and generating a control output signal coupled to the source of substantially monochromatic radiation, said control output signal being representative of whether said output transducer signal is greater than, equal to, or less than said threshold signal; and latch means responsive to the control output signal from the comparator for reducing the output of the source of substantially monochromatic radiation when the output transducer signal is less than predefined threshold signal .
12. The analyzer apparatus of claim 11 wherein said apparatus comprises a Raman spectrometer provided with a computer and an optical spectrograph.
13. The analyzer apparatus of claim 12 wherein the Raman spectrometer is further provided with a diamond reference material .
14. The analyzer apparatus of claim 11 wherein the excitation source of substantially monochromatic radiation comprises a laser.
15. The analyzer apparatus of claim 14 wherein said substantially monochromatic radiation has a wavelength of about 750 nm to 850 nm.
16. The analyzer apparatus of claim 11 wherein the first, second, and third optical channels of the probe each comprises at least one optical fiber.
17. The analyzer apparatus of claim 16 wherein said third optical channel further comprises a plurality of optical fibers.
18. The analyzer apparatus of claim 11 further comprising a filter module.
19. The analyzer apparatus of claim 18 wherein said filter module comprises: a band pass filter disposed between the excitation source and the first optical channel of the probe in close proximity to said probe, and a rejection filter disposed between the third optical channel of the probe and the first detecting means .
20. The analyzer apparatus of claim 19 wherein said band pass filter and said rejection filter each comprises two gradient index lenses.
21. The analyzer apparatus of claim 11 wherein the first detecting means for detecting radiation elastically scattered by the illuminated specimen comprises a silicon photodetector .
22. The analyzer apparatus of claim 11 wherein the second detecting means for detecting radiation inelastically scattered by the illuminated specimen comprises a multi-channel array detector.
23. The analyzer apparatus of claim 22 wherein the multi-channel array detector is a charge-coupled device or a photo-diode array.
24. The analyzer apparatus of claim 11 wherein the transducing means comprises a transimpedance amplifier.
25. The analyzer apparatus of claim 11 wherein the latch means comprises a relay and an on/off switch.
26. The analyzer apparatus of claim 11 wherein the comparator has an adjustable trip point, and the signal conditioning circuit further comprises a buffer amplifier coupled to the transducing means and a reference voltage source coupled to the buffer amplifier, said buffer amplifier being selectively connected to the comparator for generating a test output to adjust the trip point of the comparator.
27. The analyzer apparatus of claim 11 wherein said specimen is a liquid.
28. An optical probe for simultaneously and separately collecting inelastically and elastically scattered radiation from a specimen illuminated with radiation from an excitation source of substantially monochromatic radiation, said probe comprising:
a fluid-tight body comprising: a connector housing disposed at a proximal end of said probe, a terminus disposed at a distal end of said probe, and a shank disposed between and sealably connected to said connector housing and said terminus, each of said connector housing, terminus, and shank being rotationally symmetrical about an axis of said probe; a first optical channel for carrying substantially monochromatic radiation from an excitation source to illuminate a specimen disposed near to the distal end of the probe, said first optical channel being disposed within the body of the probe and extending from the proximal end to the distal end of said probe; a second optical channel for collecting radiation elastically scattered by the illuminated specimen, said second optical channel being disposed within the body of the probe and extending from the proximal end to the distal end of said probe; and a third optical channel for collecting radiation inelastically scattered by the illuminated specimen, said third optical channel being disposed within the body of the probe and extending from the proximal end to the distal end of said probe.
29. The optical probe of claim 28 adapted for use with a Raman spectrometry apparatus.
30. The optical probe of claim 28 wherein the connector housing is provided with three connector pairs, one of each of the connector pairs being connected to each of the first, second, and third optical channels.
31. The optical probe of claim 28 wherein the first, second, and third optical channels each comprises at least one optical fiber.
32. The optical probe of claim 31 wherein each said optical fiber comprises a thin, non-fluorescing, outer buffer layer.
33. The optical probe of claim 32 wherein said outer buffer layer comprises gold.
34. The optical probe of claim 31 wherein each said optical fiber is a step-indexed optical fiber.
35. The optical probe of claim 31 wherein said third optical channel further comprises a plurality of optical fibers
36. The optical probe of claim 31 further comprising a filter module, said filter module comprising a band pass filter disposed between the excitation source and the first optical channel and a rejection filter disposed between the third optical channel and a detector for elastically scattered radiation.
37. The optical probe of claim 36 wherein the first and third optical channels are each respectively connected to the band pass and rejection filters by at least one optical fiber.
38. The optical probe of claim 37 wherein each said optical fiber comprises a thin, non-fluorescing, outer buffer layer.
39. The optical probe of claim 38 wherein said buffer layer comprises gold.
40. The optical probe of claim 37 wherein each said optical fiber is a step-indexed optical fiber.
41. A method for controlling a radiation source in an analyzer apparatus, said method comprising: illuminating a specimen being examined by said analyzer apparatus using a source of substantially monochromatic radiation having a controllable output; collecting elastically scattered radiation from the specimen illuminated by said source of substantially monochromatic radiation; detecting collected elastically scattered radiation from said illuminated specimen; using a transimpedance amplifier, transducing detecting elastically scattered radiation from the specimen into an output transducer signal representative of said detected elastically scattered radiation; comparing said output transducer signal with a predefined threshold signal; and generating a control output signal coupled to the source of substantially monochromatic radiation, said control output signal causing the output of said source of substantially monochromatic radiation to be reduced, using latch means comprising a relay and an on/off switch, when said output transducer signal is less than said threshold signal.
42. The method of claim 41 wherein said analyzer apparatus comprises a Raman spectrometry apparatus, said apparatus being provided with an optical probe for interfacing a laser radiation source with the specimen, a multi-channel array, and an optical spectrograph.
43. The method of claim 42 wherein said laser radiation source provides substantially monochromatic radiation having a wavelength of about 750 nm to 850 nm.
44. The method of claim 41 wherein said detecting elastically scattered radiation is carried out using a silicon photodetector .
45. The method of claim 41 wherein said comparing the output transducer signal is carried out using a comparator.
46. The method of claim 41 wherein said specimen is a liquid.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002286065A CA2286065C (en) | 1997-03-14 | 1998-03-05 | Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation source |
| AU66870/98A AU6687098A (en) | 1997-03-14 | 1998-03-05 | Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation source |
| EP98908970A EP0970352A4 (en) | 1997-03-14 | 1998-03-05 | Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation source |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4077597P | 1997-03-14 | 1997-03-14 | |
| US60/040,775 | 1997-03-14 | ||
| US08/947,816 | 1997-10-09 | ||
| US08/947,816 US5986755A (en) | 1997-03-14 | 1997-10-09 | Elastic radiation scatter-detecting safety device analyzer apparatus provided with safety device and method for controlling a laser excitation source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998041824A1 WO1998041824A1 (en) | 1998-09-24 |
| WO1998041824B1 true WO1998041824B1 (en) | 1998-12-10 |
Family
ID=26717426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/004312 WO1998041824A1 (en) | 1997-03-14 | 1998-03-05 | Elastic radiation scatter-detecting safety device, analyzer apparatus provided with safety device, and method for controlling a laser excitation source |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5986755A (en) |
| EP (1) | EP0970352A4 (en) |
| CN (1) | CN1182374C (en) |
| AU (1) | AU6687098A (en) |
| CA (1) | CA2286065C (en) |
| ID (1) | ID22893A (en) |
| WO (1) | WO1998041824A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19882224T1 (en) * | 1997-03-14 | 2000-03-23 | Rosemount Analytical Inc | Method and device for improved control of Rayleigh backscatter |
| JP4588257B2 (en) * | 2001-06-27 | 2010-11-24 | 富士通株式会社 | Optical amplification system using Raman amplification |
| GB0206341D0 (en) * | 2002-03-18 | 2002-05-01 | Renishaw Plc | Calibration of a spectrometer |
| US6737649B2 (en) * | 2002-04-16 | 2004-05-18 | Foss Nirsystems, Inc. | Infrared analysis instrument with offset probe for particulate sample |
| DE102009029234A1 (en) * | 2009-09-07 | 2011-03-10 | Robert Bosch Gmbh | Laser projector for chassis measurement |
| FR2988473B1 (en) * | 2012-03-22 | 2014-04-18 | Spectralys Innovation | METHOD AND APPARATUS FOR CHARACTERIZING SAMPLE BY MEASURING LIGHT DISTRIBUTION AND FLUORESCENCE |
| US9606062B2 (en) * | 2013-05-27 | 2017-03-28 | Indian Institute Of Science | Method and a system for detection of hazardous chemicals in a non-metallic container |
| US10591388B2 (en) | 2015-04-27 | 2020-03-17 | Virtual Fluid Monitoring Services LLC | Fluid analysis and monitoring using optical spectroscopy |
| EP3289365A1 (en) | 2015-04-27 | 2018-03-07 | Virtual Fluid Monitoring Services LLC | Systems, apparatuses, and methods for fluid analysis and monitoring |
| CN106981411B (en) * | 2017-05-03 | 2018-02-13 | 中国地质大学（北京） | A kind of condenser system and its concentrating method |
| US11442019B2 (en) | 2018-06-19 | 2022-09-13 | Virtual Fluid Monitoring Services, Llc | Fluid analysis and monitoring using optical spectroscopy |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4573761A (en) * | 1983-09-14 | 1986-03-04 | The Dow Chemical Company | Fiber-optic probe for sensitive Raman analysis |
| FR2563773B1 (en) * | 1984-05-07 | 1986-12-05 | Marinoni Harris Sa | DEVICE FOR AUTOMATICALLY ADJUSTING THE SLOWDOWN OF THE NOTEBOOK BEFORE FOLDING IN THE FOLDERS OF THE PRESS FOLDER SQUARES |
| US5318024A (en) * | 1985-03-22 | 1994-06-07 | Massachusetts Institute Of Technology | Laser endoscope for spectroscopic imaging |
| US4953976A (en) * | 1989-03-20 | 1990-09-04 | Spectral Sciences, Inc. | Gas species monitor system |
| JPH04272122A (en) * | 1991-02-28 | 1992-09-28 | Nissan Motor Co Ltd | Laser-beam machine |
| US5526112A (en) * | 1993-03-05 | 1996-06-11 | Sahagen; Armen N. | Probe for monitoring a fluid medium |
| US5751415A (en) * | 1996-05-13 | 1998-05-12 | Process Instruments, Inc. | Raman spectroscopy apparatus and method for continuous chemical analysis of fluid streams |
-
1997
- 1997-10-09 US US08/947,816 patent/US5986755A/en not_active Expired - Fee Related
-
1998
- 1998-03-05 AU AU66870/98A patent/AU6687098A/en not_active Abandoned
- 1998-03-05 ID IDW991202A patent/ID22893A/en unknown
- 1998-03-05 WO PCT/US1998/004312 patent/WO1998041824A1/en not_active Application Discontinuation
- 1998-03-05 CA CA002286065A patent/CA2286065C/en not_active Expired - Fee Related
- 1998-03-05 EP EP98908970A patent/EP0970352A4/en not_active Withdrawn
- 1998-03-05 CN CNB988048957A patent/CN1182374C/en not_active Expired - Fee Related
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