Detector wavelength calibration

Patent metadata

Field	Value
Publication number	US-12320699-B2
Application number	US-202017785744-A
Country	US
Kind code	B2
Filing date	Dec 9, 2020
Priority date	Dec 19, 2019
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A method of calibrating a driving parameter of an optical component across an operating wavelength range of the component. The method comprises placing a layer of material in a light path, the layer of material being substantially planar and substantially transparent and having a thickness of the order of wavelengths in said range and operating said component to vary said driving parameter whilst detecting light transmitted through said layer of material to obtain driving parameter versus light intensity data. The obtained data is then compared with characterizing data previously derived for said layer of material in order to calibrate said driving parameter.

First claim

What is claimed is:

1. A method of calibrating a driving parameter of an optical component across an operating wavelength range of the component, the method comprising:
placing a layer of material in a light path, the layer of material being substantially planar and substantially transparent and having a thickness of the order of wavelengths in said range, and having a known transmission profile with a plurality of transmission maximums and a plurality of transmission minimums over at least a portion of the operation wavelength range of the component;
operating said optical component to vary said driving parameter while detecting light transmitted through said layer of material in the light path provided by a tunable light source that produces light of ultraviolet wavelengths, visible wavelengths, or infrared wavelengths to obtain driving parameter versus light intensity data; and
comparing the obtained data with characterizing data previously derived for said layer of material in order to calibrate said driving parameter.

2. The method according to claim 1 , wherein said comparing comprises aligning one or more features of the obtained data with one or more features of the characterizing data in order to calibrate the driving parameter.

3. The method according to claim 1 , wherein the thickness of said layer of material is between 1 and 20 times the maximum wavelength of the operating wavelength range of the optical component.

4. The method according to claim 1 , wherein said material is plastic.

5. The method according to claim 1 , wherein collimating optics is disposed within the light path.

6. The method according to claim 1 , wherein calibrating said driving parameter comprises creating a look-up table mapping the driving parameter to wavelength.

7. The method according to claim 1 , wherein said optical component is a spectrometer.

8. The method according to claim 7 , wherein said layer of material is interposed between the tunable light source and the spectrometer, the method comprising operating said spectrometer to vary said driving parameter while detecting light transmitted through said layer of material to obtain driving parameter versus light intensity data.

9. The method according to claim 8 further comprising disposing a reflector in the light path to reflect light from the tunable light source to the spectrometer via the layer of material.

10. The method according to claim 7 further comprising obtaining a system response by operating the spectrometer in the absence of the layer of material, and using that response to correct the detected light or calibration process.

11. The method according to claim 10 , wherein said obtaining a system response comprises detecting light from said tunable light source or from a further light source.

12. A device comprising an optical component which is operable by a driving parameter across an operating wavelength range, the device comprising a layer of material that is movably disposable in an optical path and that is substantially planar and substantially transparent and has a thickness of the order of wavelengths in said range, and having a known transmission profile with a plurality of transmission maximums and a plurality of transmission minimums over at least a portion of the operation wavelength range of the component, the device being configured to:
operate said optical component to vary said driving parameter while detecting light transmitted through said layer of material in the optical path provided by a tunable light source that produces light of ultraviolet wavelengths, visible wavelengths, or infrared wavelengths to obtain driving parameter versus light intensity data; and
compare the obtained data with characterizing data previously derived for said layer of material in order to calibrate said driving parameter.

13. The device according to claim 12 , wherein said optical component is a spectrometer.

14. The device according to claim 13 , wherein said layer of material is slidably disposed in front of said spectrometer.

15. The device according to claim 13 , further comprising tunable light source.

16. The device according to claim 14 , further comprising a light reflector for re-directing light from said tunable light source to said spectrometer.

17. The method according to claim 1 , wherein the thickness of said layer of material is between 1 and 10 times the maximum wavelength of the operating wavelength range of the optical component.

18. A device comprising:
a tunable light source that produces light ranging from ultraviolet wavelengths to infrared wavelengths;
an optical component which is operable by a driving parameter across an operating wavelength range;
a layer of material that is movably disposable in an optical path of the tunable light source and the optical component and that is substantially planar and substantially transparent and has a thickness of the order of wavelengths in said range, and having a known transmission profile with a plurality of transmission maximums and a plurality of transmission minimums over at least a portion of the operation wavelength range of the component, wherein
the optical component is varied by the driving parameter while detecting light transmitted through the layer of material in the optical path provided by the tunable light source that produces light of ultraviolet wavelengths, visible wavelengths, or infrared wavelengths to obtain driving parameter versus light intensity data and data that obtained by the optical component is compared with characterizing data previously derived for the layer of material in order to calibrate the driving parameter.

Assignees

• Ams Sensors Singapore Pte Ltd

Inventors

• Miguel Sánchez Javier
• Ishizaki Kotaro
• Roentgen Peter
• D'Aleo Francesco Paolo

Classifications

• G01N21/274

  Calibration, base line adjustment, drift correction · CPC title

• G01J2003/2866

  Markers; Calibrating of scan · CPC title

• G01J2003/2859

  Peak detecting in spectrum · CPC title

• G01J3/30

  Measuring the intensity of spectral lines directly on the spectrum itself (G01J3/42, G01J3/44 take precedence) · CPC title

• G01J3/10

  Arrangements of light sources specially adapted for spectrometry or colorimetry · CPC title