CA2618209A1 - Optical probes and methods for spectral analysis - Google Patents
Optical probes and methods for spectral analysis Download PDFInfo
- Publication number
- CA2618209A1 CA2618209A1 CA002618209A CA2618209A CA2618209A1 CA 2618209 A1 CA2618209 A1 CA 2618209A1 CA 002618209 A CA002618209 A CA 002618209A CA 2618209 A CA2618209 A CA 2618209A CA 2618209 A1 CA2618209 A1 CA 2618209A1
- Authority
- CA
- Canada
- Prior art keywords
- probe head
- optical
- head assembly
- sample volume
- sample
- 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.)
- Granted
Links
- 239000000523 sample Substances 0.000 title claims abstract 57
- 230000003287 optical effect Effects 0.000 title claims abstract 31
- 238000000034 method Methods 0.000 title claims abstract 4
- 238000010183 spectrum analysis Methods 0.000 title abstract 2
- 230000000903 blocking effect Effects 0.000 claims abstract 10
- 239000000463 material Substances 0.000 claims 12
- 239000011888 foil Substances 0.000 claims 1
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
The present invention relates to spectral analysis systems and methods for determining physical and chemical properties of a sample by measuring the optical characteristics of light emitted from the sample. In one embodiment, a probe head for use with a spectrometer includes a reflector for illuminating a sample volume disposed circumferentially about the light source of the probe head. In another embodiment, a probe head includes an optical blocking element for forcing the optical path between the light source and an optical pick-up optically connected to the spectrometer into the sample. The probe head also includes a reference shutter for selectively blocking light emitted from the sample from reaching the optical pick-up facilitate calibration of the spectrometer.
Claims (16)
1. A probe head assembly for use with a spectrometer to analyze a material, the probe head assembly comprising:
a probe head (501) having a housing (503), a sample window (530) arranged in the housing, a light source (540) arranged to irradiate a sample volume (510) of the material proximate to the sample window, an optical pick-up (590) arranged to receive light emitted from the irradiated sample volume through the sample window and transmit the emitted light to the spectrometer for analysis, an optical blocking element (550) biased into contact with the sample window and when in contact with the sample window, the optical blocking element is positioned in an optical path (545) between the light source and the optical pick-up to force the optical path into the sample volume and to effectively minimize direct surface reflection from the sample window or the sample volume by blocking such direct surface reflection from reaching the optical fiber, whereby an allowed optical path, which includes the optical path (545), originates from the light source, undergoes diffusive transport in the sample volume, and is collected and transported within an aperture of the optical pick up, and a reference shutter (520) adapted to selectively block light emitted from the irradiated sample volume from reaching the optical pick-up to facilitate calibration of the spectrometer.
a probe head (501) having a housing (503), a sample window (530) arranged in the housing, a light source (540) arranged to irradiate a sample volume (510) of the material proximate to the sample window, an optical pick-up (590) arranged to receive light emitted from the irradiated sample volume through the sample window and transmit the emitted light to the spectrometer for analysis, an optical blocking element (550) biased into contact with the sample window and when in contact with the sample window, the optical blocking element is positioned in an optical path (545) between the light source and the optical pick-up to force the optical path into the sample volume and to effectively minimize direct surface reflection from the sample window or the sample volume by blocking such direct surface reflection from reaching the optical fiber, whereby an allowed optical path, which includes the optical path (545), originates from the light source, undergoes diffusive transport in the sample volume, and is collected and transported within an aperture of the optical pick up, and a reference shutter (520) adapted to selectively block light emitted from the irradiated sample volume from reaching the optical pick-up to facilitate calibration of the spectrometer.
2. The probe head assembly of claim 1, wherein the optical blocking element (550) is opaque.
3. The probe head assembly of claim 1 or 2, wherein the reference shutter (520) is movable between a closed position that blocks light emitted from the sample volume (510) from reaching the optical pick-up (590) and an open position that permits light emitted from the sample volume to reach the optical pick up (590).
4. The probe head assembly of claim 3, wherein movement of the reference shutter (520) from the open position to the closed position causes the optical blocking element (550) to move out of contact with the sample window (530).
5. The probe head assembly of any one of claims 1 to 4, wherein the reference shutter (520) includes a reference surface (522) having a uniform reflectance value to facilitate calibration of the spectrometer.
6. The probe head assembly of claim 1, further comprising a planing element shaped to cause the probe head (501) to skim the surface of a flowing material when in contact with the flowing material.
7. The probe head assembly of claim 6, wherein the planing element has a convex surface for contacting the flowing material.
8. The probe head assembly of claim 7, further comprising a constant force generator for applying a constant force to the probe head (501) to maintain the planing element in contact with a surface of the flowing material.
9. The probe head assembly of claim 8, wherein the constant force generator comprises a spring or a pneumatic element.
10. The probe head assembly of claim 1, further comprising a second probe head, wherein the first and second probe heads are simultaneously able to irradiate and collect spectral information on a flowing material, wherein the housing (503) is shaped for disposal of the probe head assembly in the path of the flowing material.
11. The probe head assembly of claim 10, wherein the housing (503) is aerodynamically shaped to minimize turbulence of the flowing material within the sample volume.
12. The probe head assembly of claim 11, wherein the housing (503) is shaped like an air foil having a leading edge adapted to be oriented to face the flowing material.
13. The probe head assembly of claim 12, wherein the probe heads (501) are arranged along a common axis within the housing (503).
14. The probe head assembly of claim 13, wherein the probe heads (501) are configured in a two-dimensional array.
15. A method of spectroscopically analyzing a material comprising:
irradiating a sample volume (510) of the material with light from a light source (540) through a sample window (530), transmitting light emitted from the irradiated sample volume through the sample window to an optical pickup (590) that is optically connected to a spectrometer, positioning an optical blocking element (550) in an optical path between the light source and the optical pickup, thereby forcing the optical path between the light source and the optical pick-up into the sample volume and inhibiting reflections from the sample window within the optical path from reaching the optical pickup, and to facilitate calibration of the spectrometer, selectively blocking light emitted from the irradiated sample volume from reaching the optical pick-up.
irradiating a sample volume (510) of the material with light from a light source (540) through a sample window (530), transmitting light emitted from the irradiated sample volume through the sample window to an optical pickup (590) that is optically connected to a spectrometer, positioning an optical blocking element (550) in an optical path between the light source and the optical pickup, thereby forcing the optical path between the light source and the optical pick-up into the sample volume and inhibiting reflections from the sample window within the optical path from reaching the optical pickup, and to facilitate calibration of the spectrometer, selectively blocking light emitted from the irradiated sample volume from reaching the optical pick-up.
16. The method of claim 15, wherein the step of selectively blocking light includes selectively moving a reference shutter (520) into the optical path to block light, which is emitted from the irradiated sample volume, from reaching the optical pick-up (590).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18854100P | 2000-03-10 | 2000-03-10 | |
| US60/188,541 | 2000-03-10 | ||
| CA002402230A CA2402230C (en) | 2000-03-10 | 2001-03-09 | Optical probes and methods for spectral analysis |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002402230A Division CA2402230C (en) | 2000-03-10 | 2001-03-09 | Optical probes and methods for spectral analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2618209A1 true CA2618209A1 (en) | 2001-09-20 |
| CA2618209C CA2618209C (en) | 2010-01-05 |
Family
ID=39367249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002618209A Expired - Fee Related CA2618209C (en) | 2000-03-10 | 2001-03-09 | Optical probes and methods for spectral analysis |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2618209C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111141678A (en) * | 2020-02-13 | 2020-05-12 | 南京法迈特科技发展有限公司 | Rapid bacteria liquid qualification detection device and detection method thereof |
| CN112748073A (en) * | 2019-10-31 | 2021-05-04 | 中国石油化工股份有限公司 | Material in-situ characterization sample cell and use method thereof |
-
2001
- 2001-03-09 CA CA002618209A patent/CA2618209C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748073A (en) * | 2019-10-31 | 2021-05-04 | 中国石油化工股份有限公司 | Material in-situ characterization sample cell and use method thereof |
| CN112748073B (en) * | 2019-10-31 | 2024-05-31 | 中国石油化工股份有限公司 | Material in-situ characterization sample cell and use method thereof |
| CN111141678A (en) * | 2020-02-13 | 2020-05-12 | 南京法迈特科技发展有限公司 | Rapid bacteria liquid qualification detection device and detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2618209C (en) | 2010-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |