Noninvasive alcohol sensor

• US 20060002598A1
• Filed: 07/08/2005
• Published: 01/05/2006
• Est. Priority Date: 04/04/2003
• Status: Active Grant

• Current Assignee: HID Global Corporation (Assa Abloy AB)
• Original Assignee: Lumidigm Incorporated (Assa Abloy AB)
• Inventors: Rowe, Robert K., Sidlauskas, David P., Harbour, Robert M.
• Granted Patent: US 7,386,152 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: A61B 5/1171 based on the shapes or appearances of their bodies or parts thereof
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/14558 by polarisation
• CPC Class Codes: B60K 28/06 responsive to incapacity of driver
• CPC Class Codes: B60R 25/252 Fingerprint recognition
• CPC Class Codes: B60W 2540/22 Psychological state; Stress level or workload
• CPC Class Codes: B60W 2540/221 Physiology, e.g. weight, heartbeat, health or special needs
• CPC Class Codes: B60W 2540/24 Drug level, e.g. alcohol
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence
• CPC Class Codes: G06V 40/1341 Sensing with light passing through the finger
• CPC Class Codes: G06V 40/14 Vascular patterns

Abstract

Methods and systems are provided for biometric sensing. An illumination subsystem provides light at discrete wavelengths to a skin site of an individual. A detection subsystem receives light scattered from the skin site. A computational unit is interfaced with the detection system. The computational unit has instructions for deriving a spatially distributed multispectral image from the received light at the discrete wavelengths. The computational unit also has instructions for comparing the derived multispectral image with a database of multispectral images to identify the individual.

Claims

1. A method for determining a blood-alcohol level of an individual, the method comprising:

receiving electromagnetic radiation emanating from tissue of the individual in response to propagation of electromagnetic radiation into the tissue of the individual;

analyzing spectral properties of the received electromagnetic radiation; and

determining the blood-alcohol level from the analyzed spectral properties.

2. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation within a wavelength range of 2.1-2.5 μ

m.

3. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation within a wavelength range of 2.2-2.4 μ

m.

4. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation at one or more wavelength values approximately equal to values selected from the group consisting of 2.23 μ

m, 2.26 μ

m, 2.28 μ

m, 2.30 μ

m, 2.32 μ

m, 2.25 μ

m, and 2.38 μ

m.

5. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation within a wavelength range of 1.5-1.9 μ

m.

6. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation within a wavelength range of 1.6-1.8 μ

m.

7. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises determining amplitudes of the received electromagnetic radiation at one or more wavelength values approximately equal to values selected from the group consisting of 1.67 μ

m, 1.69 μ

m, 1.71 μ

m, 1.73 μ

m, 1.74 μ

m 1.76 μ

m and 1.78 μ

m.

8. The method recited in claim 1 wherein analyzing spectral properties of the received electromagnetic radiation comprises correcting for optical drift of the received electromagnetic radiation.

9. The method recited in claim 8 wherein correcting for optical drift comprises measuring electromagnetic radiation emanating from a reference sample in response to propagation of electromagnetic radiation into the reference sample.

10. The method recited in claim 9 wherein the reference sample comprises a mixture of alcohol and water.

11. The method recited in claim 9 wherein measuring electromagnetic radiation emanating from the reference sample comprises measuring electromagnetic radiation within a wavelength range of 2.1-2.5 μ

m.

12. The method recited in claim 9 wherein measuring electromagnetic radiation emanating from the reference sample comprises measuring electromagnetic radiation within a wavelength range of 1.5-1.9 μ

m.

13. The method recited in claim 1 further comprising taking an action in response to a determination that the blood-alcohol level of the individual is outside a prescribed range.

14. The method recited in claim 15 wherein taking the action comprises prohibiting ignition of a motor vehicle.

15. The method recited in claim 1 further comprising making a biometric identification of the individual.

16. The method recited in claim 15 wherein making a biometric identification of the individual comprises comparing a spectral variation of the received electromagnetic radiation with a previously stored spectral variation.

17. The method recited in claim 15 further comprising taking an action in response to a combination of the determined blood-alcohol level and the biometric identification of the individual.

18. The method recited in claim 15 wherein:

the electromagnetic radiation is propagated into the tissue of the individual at a skin site with a plurality of discrete wavelengths; and

making the biometric identification of the individual comprises;

deriving a spatially distributed multispectral image from electromagnetic radiation scattered from the skin site; and

comparing the derived multispectral image with a database of derived multispectral images.

19. Apparatus for determining a blood-alcohol level of an individual, the apparatus comprising:

a receiver adapted to receive electromagnetic radiation emanating from tissue of the individual in response to propagation of electromagnetic radiation into the tissue of the individual; and

a computer-readable storage medium coupled with a processor, the computer-readable storage medium having a computer-readable program embodied therein for directing operation of the processor, the computer-readable program including;

instructions for analyzing spectral properties of the received electromagnetic radiation; and

instructions for determining the blood-alcohol level from the analyzed spectral properties.

20. The apparatus recited in claim 19 wherein the receiver comprises a sensor and an optical bandpass filter adapted to propagate light having a wavelength range of 2.1-2.5 μ

m.

21. The apparatus recited in claim 19 wherein the receiver comprises a plurality of sensors and a plurality of optical bandpass filters adapted to propagate light at a wavelength values approximately equal to values selected from the group consisting of 2.23 μ

m, 2.26 μ

m, 2.28 μ

m, 2.30 μ

m, 2.32 μ

m, 2.25 μ

m, and 2.38 μ

m.

22. The apparatus recited in claim 19 wherein the receiver comprises a sensor and an optical bandpass filter adapted to propagate light having a wavelength range of 1.5-19 μ

m.

23. The apparatus recited in claim 19 wherein the receiver comprises a plurality of sensors and a plurality of optical bandpass filters adapted to propagate light at a wavelength values approximately equal to values selected from the group consisting of 1.67 μ

m, 1.69 μ

m, 1.71 μ

m, 1.73 μ

m, 1.74 μ

m 1.76 μ

m and 1.78 μ

m.

24. The apparatus recited in claim 19 wherein the receiver comprises:

a variable filter; and

a detector array.

25. The apparatus recited in claim 24 wherein the detector array comprises a semiconductor detector array.

26. The apparatus recited in claim 24 wherein the detector array comprises a pyroelectric detector array.

27. The apparatus recited in claim 24 wherein the detector array comprises a bolometer detector array.

28. The apparatus recited in claim 19 further comprising a source of electromagnetic radiation adapted to propagate electromagnetic radiation into the tissue of the individual.

29. The apparatus recited in claim 28 wherein the source comprises a light-emitting diode.

30. The apparatus recited in claim 28 wherein the source comprises a laser diode.

31. The apparatus recited in claim 30 wherein the laser diode is tunable.

32. The apparatus recited in claim 19 wherein the computer-readable program further includes instructions for making a biometric identification of the individual from the received electromagnetic radiation.

33. The apparatus recited in claim 19 further comprising a biometric device adapted to make a biometric identification of the individual.

34. The apparatus recited in claim 33 wherein:

the electromagnetic radiation is propagated into the tissue of the individual at a skin site with a plurality of discrete wavelengths; and

the computer-readable program further includes;

instructions for deriving a spatially distributed multispectral image from electromagnetic radiation scattered from the skin site; and

instructions for comparing the derived multispectral image with a database of derived multispectral images.

35. The apparatus recited in claim 33 wherein the biometric identification is a nonoptical biometric identification.

36. A key fob comprising the apparatus recited in claim 19.

37. A motor vehicle comprising the apparatus recited in claim 19.