Video fluorometer

• US 4,031,398 A
• Filed: 03/23/1976
• Issued: 06/21/1977
• Est. Priority Date: 03/23/1976
• Status: Expired due to Term

• Current Assignee: Research Corporation
• Original Assignee: Research Corporation
• Inventors: Callis, James B., Davidson, Ernest R.
• Primary Examiner(s): Dixon, Harold A.
• Application Number:
  US05/669,493
• Time in Patent Office: 455 Days
• Field of Search: 250/458, 250/304, 250/365, 250/460, 250/461, 250/328
• US Class Current: 250/458.1
• CPC Class Codes: G01J 3/4406 Fluorescence spectrometry

Abstract

A fluoroescence spectrometer or fluorometer for simultaneously presenting the excitation and emission spectra of a multicomponent sample in the form of an intensity matrix is disclosed which comprises an elongated cuvette for holding the fluoroescent sample, along whose length a spatially distributed spectrum of exciting energies is simultaneously directed, and a polychromatic analyzer which simultaneously analyzes the excitation and emission spectra given off by the sample along its length by producing a spectrally dispersed image of the cuvette. The matrix of spectral intensities so obtained may be converted to electrical signals by a low-light-level television detector and displayed on a video monitor or processed with appropriate analog or digital computers for immediate analysis. The instrument can acquire 241 emission spectra taken at 241 different exciting wavelengths in 16.7 milliseconds.

Claims

1. Apparatus for fluorescence spectroscopy comprising:

a. means for holding a sample of fluorescent material;

b. means for simultaneously directing a spatially distributed spectrum of exciting energies onto said sample distributed along its length; and

c. means for simultaneously analyzing the set of fluorescence emissions given off by said sample along its length by producing a fluorescence intensity matrix of the excitation and emission spectra.

2. Apparatus as in claim 1 further comprising means for sensing said fluorescence intensity matrix and means for analyzing said sensed matrix to determine the components of the sample.

3. Apparatus as in claim 2 wherein said sensing means comprises a video detector.

4. Apparatus as in claim 1 wherein said means for directing said spectrum of exciting energies comprises an excitation monochromator having an entrance slit whose short axis is parallel to the long axis of said sample holding means and whose exit slit is removed.

5. Apparatus as in claim 1 wherein said means for analyzing the set of fluorescence emissions comprises an analyzing monochromator having a wide aperture exit.

6. A fluorometer comprising:

a. first polychromator means for producing a spatially distributed spectrum of exciting energies;

b. a sample cuvette means for holding a sample of fluorescent material and having a long axis disposed such that said spatially distributed exciting energies from said first polychromator means excite said sample along its length; and

c. second polychromator means, disposed adjacent to said sample cuvette means to receive the emitted energies given off by the excited sample along its length, for simultaneously analyzing the excitation and emission spectra of said sample by producing a fluorescence intensity matrix of the excitation and emission spectra.

7. A fluorometer as in claim 6 wherein said second polychromator means comprises:

d. entrance slit means for passing the energies emitted by said sample upon excitation along its length and disposed adjacent said cuvette means with its long axis parallel to the long axis of said cuvette means;

e. optical means for analyzing said energies emitted by said sample after passage by said slit means by producing a fluorescence intensity matrix of the excitation and emission spectra of said sample; and

f. exit aperture means for passing said fluorescence intensity matrix.

8. A fluorometer as in claim 7 wherein said first polychromator means comprises:

d. means for producing exciting energy;

e. entrance slit means for passing said exciting energy and having its short axis disposed parallel to the long axis of said cuvette means;

f. optical means for spatially distributing said exciting energy after passage by said slit means into a spectrum of wavelengths along an axis; and

g. means for directing said spatially distributed spectrum of wavelengths onto said cuvette means distributed along its long axis.

9. A fluorometer as in claim 8 wherein the plane, containing said axis along which said wavelengths are spatially distributed and said long axis of said cuvette means, is disposed at an angle of less than 180°

with respect to the plane containing said long axis of said cuvette means and said long axis of said entrance slit means of said second polychromator means.

10. A fluorometer as in claim 6 further comprising means for converting said fluorescence intensity matrix into a computer graphics display.

11. A method of analyzing fluorescence spectra comprising the steps of:

a. obtaining a sample of fluorescent material to be analyzed;

b. directing a spatially distributed spectrum of exciting energies onto said sample distributed along an axis to excite said sample; and

c. simultaneously analyzing the set of fluorescence emissions given off by said sample upon excitation along said axis by producing a fluorescence intensity matrix of the excitation and emission spectra.

12. A method as in claim 11 comprising the further step of analyzing said fluorescence intensity matrix to determine the components of the sample.

13. A method as in claim 11 comprising the further step of sensing said fluorescence intensity matrix with a video detector.

14. A method as in claim 11 comprising the further steps of converting said fluorescence intensity matrix into an analogous electronic matrix and analyzing said electronic matrix.

15. A method as in claim 14 wherein said analyzing step comprises presenting said electronic matrix on a computer graphics display.

16. A fluorescence spectrometer comprising:

a. means having an axis for holding a sample of fluorescent material;

b. means for directing exciting energy onto said sample distributed along the axis of said holding means; and

c. means for simultaneously analyzing the set of fluorescence emissions given off by said sample along said axis over a predetermined range of emission wavelengths by producing a fluorescence intensity matrix of the excitation and emission spectra.

17. A fluorescence spectrometer as in claim 16 further comprising:

d. means for determining the eigenvalues and eigenvectors associated with said fluorescence intensity matrix; and

e. means for linearly transforming the eigenvectors so that the transformed vectors obey constraints consistent with the physics of fluorescence.

18. A method of fluorescence analysis comprising the steps of:

a. providing a sample of fluorescent material to be analyzed;

b. directing exciting energy onto said sample distributed along an axis; and

c. analyzing the emitted energies given off by the excited sample by simultaneously producing the excitation and emission spectra thereof in the form of a fluorescence intensity matrix.

19. A method as in claim 18 further comprising the steps of:

d. determining the eigenvalues and eigenvectors associated with said fluorescence matrix; and

e. linearly transforming the eigenvectors so that the transformed vectors obey constraints consistent with the physics of fluorescence.