CA2618209A1 - Optical probes and methods for spectral analysis - Google Patents

Optical probes and methods for spectral analysis Download PDF

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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
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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
Application number
CA002618209A
Other languages
French (fr)
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CA2618209C (en
Inventor
David M. Mayes
Anthony K. Maczura
Charles W. Von Rosenberg
Anthony S. Lee
Erich R. Gross
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Textron Systems Corp
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from CA002402230A external-priority patent/CA2402230C/en
Publication of CA2618209A1 publication Critical patent/CA2618209A1/en
Application granted granted Critical
Publication of CA2618209C publication Critical patent/CA2618209C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • 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.
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.
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).
CA002618209A 2000-03-10 2001-03-09 Optical probes and methods for spectral analysis Expired - Fee Related CA2618209C (en)

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

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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

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CA (1) CA2618209C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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