SPECTROMETER

• US 20060152731A1
• Filed: 12/01/2003
• Published: 07/13/2006
• Est. Priority Date: 12/02/2002
• Status: Abandoned Application

• Current Assignee: JOHANN WOLFGANG GOETHE-UNIVERSITAET
• Original Assignee: JOHANN WOLFGANG GOETHE-UNIVERSITAET
• Inventors: Klein, Oliver, Hosafci, Gamze, Maentele, Werner, Winter, Ernst
• Application Number:
  US10/537,181
• Publication Number:
  US 20060152731A1
• Time in Patent Office: Days
• US Class Current: 356/445
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/10 Arrangements of light sources specially adapted for spectrometry or colorimetry
• CPC Class Codes: G01J 3/42 Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry beam switching arrangements G01J3/08
• CPC Class Codes: G01J 3/4406 Fluorescence spectrometry
• CPC Class Codes: G01N 2021/6417 Spectrofluorimetric devices
• CPC Class Codes: G01N 2021/6419 Excitation at two or more wavelengths
• CPC Class Codes: G01N 2021/6421 Measuring at two or more wavelengths
• CPC Class Codes: G01N 2021/6484 Optical fibres
• CPC Class Codes: G01N 21/645 Specially adapted constructive features of fluorimeters

Abstract

A reflection spectrometer provided with a probe to which the radiation of at least one radiation source can be transmitted by at least one radiation emission conductor transmitter in such a way that said radiation source can be directed to or in an investigated object and which makes it possible to transmit radiation to or in an investigated object and/or emitted by such object to a radiation receiver that can be connected to an evaluation unit by means of at least one radiation emission conductor. The disclosure also relates to a transmitted light spectrometer which includes a probe to which the radiation of at least one radiation source can be transmitted by at least one radiation emission conductor in such a way that the radiation source can be directed to or in an investigated object. The spectrometer includes at least one remote radiation emission conductor of the probe which is used for transmitting radiation to or in an investigated object to a radiation receiver which can be connected to an evaluation unit.

Claims

1. Transmission spectrometer comprising a sensor to which, through at least one optical waveguide for emitted radiation, the radiation of at least one radiation source can be introduced, in order to direct it on and/or in an object to be investigated, and with an optical waveguide for detected radiation spaced from the sensor, through which radiation, which was scattered by, transmitted by and/or emitted by the object to be investigated can be introduced to a radiation detector connected to an evaluation unit, the transmission spectrometer further comprising

a plurality of radiation sources, each having an adjustable radiation intensity, and which have an emission spectrum which is broadband either per radiation source or for all radiation sources together, and each of which is coupled directly to an optical waveguide for emitted radiation,

the radiation detector detecting the entire spectrum of the radiation which is entered in the optical waveguide for detected radiation by diffuse and/or directional reflection, transmission, emission and/or fluorescence, and

in the evaluation unit, as a function of at least one program which can be selected through an operating unit for the calculation of at least one parameter, at least the intensity of one given wavelength can be processed, and the evaluation unit is in working connection with the radiation sources in such a way that, depending on the selected program, the intensity of the radiation emitted from each radiation source can be adjusted individually, and wavelengths with corresponding intensities, which arrive from the radiation detector to the evaluation unit, can be selected.

3. Spectrometer according to claim 1, wherein the

radiation sources are selected from the group consisting of cold light sources and semiconductors.

4. Spectrometer according to claim 1,

wherein the radiation sources all emit equally in

broadband or at least partly differently in a specified spectral region.

5. Spectrometer according to of claim 1,

wherein at least two radiation sources emit in different or not completely overlapping spectral regions.

6. Spectrometer according to claim 4, wherein the radiation sources include at least one radiation source for emitting red light, at least one radiation source for emitting blue light and at least one radiation source for emitting green light.

7. Spectrometer according to claim 1, wherein the radiation detector includes an optical multi-channel detector.

8. Spectrometer according to claim 1, wherein in the evaluation unit a number of individual spectra can be deposited in a time sequence, and can be analyzed.

9. Spectrometer according to claim 8, wherein at least two, individual spectra can be received at intervals in the range of microseconds to seconds.

10. Spectrometer according to claim 1, wherein in the evaluation unit signals from the radiation detector can be resolved into a timewise constant and a timewise changeable, component for separate evaluation.

11. Spectrometer according to claim 1, wherein in the evaluation unit programs are stored for at least one of food control;

determination of oxygen saturation and/or hemoglobin concentration in tissue;

the control of the color, reflection and/or gloss properties of surfaces, dyes and/or paints;

medical analysis;

process analysis, and environmental analysis.

12. Spectrometer according to claim 1, wherein the sensor is surrounded by an endoscope, the sensor having a housing separate from the radiation sources and the radiation detector and/or the sensor can be handheld.

13. Spectrometer according to claim 1, wherein at least one radiation source can be switched at least for one time period of a measurement in pulsed operation or can be operated with a multiplex pattern.

14. Spectrometer according to claim 13, wherein at least two radiation sources in pulsed operation can be switched or each can be operated with an individual multiplex pattern, where at least two radiation sources are emitting in different or in only partially overlapping spectral regions.

2. Reflection spectrometer comprising a sensor to which, through at least one optical waveguide for emitted radiation, the radiation of at least one radiation source can be introduced, in order to direct it on and/or in an object to be investigated, and through which, with at least one optical waveguide for detected radiation, radiation, which was scattered by, transmitted by and/or emitted by the object to be investigated, can be introduced to a radiation detector connected to an evaluation unit, whereby at a free end of the sensor, a radiation coupling-in end of the optical waveguide for detected radiation is surrounded by radiation coupling-out ends of the optical waveguides for emitted radiation, so that in the measuring range on and/or in the object to be investigated, there is at least a partial overlap of the aperture of the optical waveguide for detected radiation with the aperture of the optical waveguide for emitted radiation, the radiation spectrometer further comprising

a plurality of radiation sources, each having an adjustable radiation intensity, and which have an emission spectrum which is broadband either per radiation source or for all radiation sources together, and each of which is coupled directly to an optical waveguide for emitted radiation,

the radiation detector detecting the entire spectrum of the radiation which is entered in the optical waveguide for detected radiation by diffuse and/or directional reflection and/or fluorescence, and

in the evaluation unit, as a function of at least one program which can be selected through an operating unit for the calculation of at least one parameter,

at least the intensity of one given wavelength can be processed and

the evaluation unit is in working connection with the radiation sources in such a way that, depending on the selected program, the intensity of the radiation emitted from each radiation source can be adjusted individually, and wavelengths with corresponding intensities, which arrive from the radiation detector to the evaluation unit can be selected.

17. Spectrometer according to claim 2 wherein the radiation sources are selected from the group consisting of cold light sources and semiconductors.

18. Spectrometer according to claim 2, wherein the radiation sources all emit equally in broadband or at least partly differently in a specified spectral region.

19. Spectrometer according to of claim 2, wherein at least two radiation sources emit in different or not completely overlapping spectral regions.

20. Spectrometer according to claim 19, wherein the radiation sources include at least one radiation source for emitting red light, at least one radiation source for emitting blue light and at least one radiation source for emitting green light.

21. Spectrometer according to claim 2, wherein the radiation detector includes an optical multi-channel detector.

22. Spectrometer according to claim 2, wherein in the evaluation unit a number of individual spectra can be deposited in a time sequence, and can be analyzed.

23. Spectrometer according to claim 22, wherein at least two, individual spectra can be received at intervals in the range of microseconds to seconds.

24. Spectrometer according to claim 2, wherein in the evaluation unit signals from the radiation detector can be resolved into a timewise constant and a timewise changeable, component for separate evaluation.

25. Spectrometer according to claim 2, wherein in the evaluation unit programs are stored for at least one of food control;

determination of oxygen saturation and/or hemoglobin concentration in tissue;

control of the color, reflection and/or gloss properties of surfaces, dyes and/or paints;

medical analysis;

process analysis, and environmental analysis.

26. Spectrometer according to claim 2, wherein the sensor is surrounded by an endoscope, the sensor having a housing separate from the radiation sources and the radiation detector and/or the sensor can be handheld.

27. Spectrometer according to claim 2, wherein at least one radiation source can be switched at least for one time period of a measurement in pulsed operation or can be operated with a multiplex pattern.

28. Spectrometer according to claim 27, wherein at least two radiation sources in pulsed operation can be switched or each can be operated with an individual multiplex pattern, where at least two radiation sources are emitting in different or in only partially overlapping spectral regions.

15-16. -16. (canceled)