Method and apparatus for rapid, non-contact measurement of the core temperature of animals and humans

• US 7,336,987 B2
• Filed: 01/24/2003
• Issued: 02/26/2008
• Est. Priority Date: 01/25/2002
• Status: Expired due to Fees

• Current Assignee: Vital Accuracy Partners
• Original Assignee: Jack C. Laurence, James D. King, Laird W. Laurence
• Inventors: King, James D., Laurence, Laird W., Laurence, Jack C.
• Primary Examiner(s): Smith; Ruth S.
• Application Number:
  US10/350,880
• Publication Number:
  US 20030142723A1
• Time in Patent Office: 1,859 Days
• Field of Search: 600/474, 600/549, 374/121, 374/126, 374/128, 374/129, 374/132, 374/133
• US Class Current: 600/474
• CPC Class Codes: G01J 5/0022 for sensing the radiation of moving bodies
• CPC Class Codes: G01J 5/0025 Living bodies ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G01J 5/064 Ambient temperature sensor; Housing temperature sensor; Constructional details thereof
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0801 Means for wavelength selection or discrimination
• CPC Class Codes: G01J 5/70 Passive compensation of pyrometer measurements, e.g. using ambient temperature sensing or sensing of temperature within housing
• CPC Class Codes: G01K 11/006 using measurement of the effect of a material on microwaves or longer electromagnetic waves, e.g. measuring temperature via microwaves emitted by the object G01K17/003, G01J5/00 take precedence; measuring the effect of a material on X-, gamma- or particle radiation G01K11/30

Abstract

A method and apparatus for measuring the core temperature of an animal or human. Emissions from the eyeball are detected, at one or more wavelengths selected on the basis of various factors, including the ability of that wavelength to reach the interior of the eyeball. An illumination marker shines a spot of light on the eyeball, such that the spot corresponds to the area from which emissions are being detected.

Claims

1. A device for measuring the core temperature of a subject animal or human, comprising:

a non-contact sensor unit for non-contact sensing of thermal emissions only from the eye of the subject, the sensor unit having a filter operable to permit only selected wavelengths of the thermal emissions to be detected, and having a detector operable to detect selected wavelengths of the thermal emissions and to generate an electrical signal corresponding to the intensity of the thermal emissions;

wherein the selected wavelengths are emitted from a particular depth within the eyeball;

an amplifier unit for amplifying the electrical signal from the sensor-and for producing an amplified electrical signal;

a data processing unit for converting the amplified signal to raw temperature data and for determining core temperature data based on the raw temperature data; and

a display for displaying the core temperature data of the subject.

2. The device of claim 1, wherein the sensor unit detects only near infrared emissions.

3. The device of claim 1, wherein the sensor unit detects millimeter wavelength emissions.

4. The device of claim 1, wherein the sensor unit detects micrometer wavelength emissions.

5. The device of claim 1, wherein the sensor unit detects more than one central wavelength.

6. The device of claim 1, wherein the sensor unit has a single light path for a single central wavelength.

7. The device of claim 1, wherein the sensor unit has more than one light path for detecting more than one central wavelength.

8. The device of claim 1, further comprising a calibration unit for delivering calibration data to the data processing unit.

9. The device of claim 1, further comprising a temperature sensor for measuring the temperature of the device.

10. The device of claim 1, further comprising a light shield for shielding the sensor unit from thermal emissions unrelated to emissions from the eye.

11. The device of claim 1, further comprising an illumination marker operable to emit a beam of visible light corresponding to a receiving area of the sensor unit.

12. The device of claim 1, further comprising an identification sensor for detecting an identification code associated with the subject.

13. The device of claim 1, wherein the filter passes wavelengths from 1000-2500 nanometers.

14. The device of claim 1, wherein the filter passes wavelengths from 1600-1800 nanometers.

15. The device of claim 1, wherein the filter passes wavelengths from 2150-2350 nanometers.

16. The device of claim 1, wherein the filter passes wavelengths from 1600-1800 and 2150-2350 nanometers.

17. The device of claim 1, wherein the sensor is operable to detect thermal emissions from a first bandwidth and a second bandwidth, wherein the first bandwidth may be wider than the second bandwidth or centered on a different wavelength, or both;

and wherein the data processing unit is further operable to compare the detected amplitude of the signal from the first bandwidth to the amplitude of the signal from the second bandwidth, and to compensate the temperature data based on the comparison.

18. A method of measuring core temperature of a subject animal or human, comprising the steps of:

using a non-contact sensor unit for non-contact sensing of thermal emissions only from the eye of the subject, by using a filter to filter thermal emissions from the eyeball of the subject, such that only selected wavelengths pass through the filter and by using a detector to detect the filtered thermal emissions;

wherein the thermal emissions have a wavelength associated with a particular depth within the eyeball;

generating an electrical signal corresponding to the intensity of the emissions;

receiving the electrical signal at a data processing unit;

converting the electrical signal to raw temperature data;

processing the raw temperature data by using the raw temperature data to determine core temperature data; and

displaying the core temperature data.

19. The method of claim 18, wherein the step of detecting the filtered emissions is performed by detecting a wavelength appropriate for a particular depth into the eyeball.

20. The method of claim 18, wherein the step of detecting the filtered emissions is performed by controlling the effective sensing area of the detector.

21. The method of claim 18, further comprising the step of calibrating the core temperature data, based on data from rectal thermometry measurements.

22. The method of claim 18, further comprising the step of measuring the sensor temperature and compensating the core temperature data with the measured sensor temperature.

23. The method of claim 18, wherein the step of detecting the filtered emissions is performed by detecting multi-spectral thermal radiation data.

24. The method of claim 18, further comprising the step of detecting identification data associated with the subject.

25. The method of claim 24, wherein the step of detecting identification data is performed by reading data from a tag which is attached to or inserted into the subject.

26. The method of claim 24, further comprising the step of storing the identification data and the core temperature data.

27. The method of claim 18, further comprising the step of maintaining the sensor unit at a constant temperature during the sensing step.

28. The method of claim 18, further comprising the step of cooling the sensor unit during the sensing step.

29. The method of claim 18, further comprising the step of illuminating an area on the eye from which the thermal emissions are detected.

30. The method of claim 18, wherein the filtering step passes wavelengths from 1000-2500 nanometers.

31. The method of claim 18, wherein the filtering step passes wavelengths from 1600-1800 nanometers.

32. The method of claim 18, wherein the filtering step passes wavelengths from 2150-2350 nanometers.

33. The method of claim 18, wherein the filtering step passes wavelengths from 1600-1800 and 2150-2350 nanometers.

34. A method of measuring core temperature of a subject animal or human, comprising the steps of:

using a non-contact sensor unit for non-contact sensing of thermal emissions only from the eye of the subject, by using a filter to filter thermal emissions from the eyeball of the subject, such that only selected wavelengths pass through the filter and by using a detector to detect the filtered thermal emissions;

generating an electrical signal corresponding to the intensity of the emissions;

receiving the electrical signal at a data processing unit;

converting the electrical signal to core temperature data;

displaying the core temperature of the subject data on a display readout; and

detecting identification data associated with the subject.

35. The method of claim 34, wherein the step of detecting identification data is performed by reading data from a tag which is attached to or inserted into the subject.

36. The method of claim 34, further comprising the step of storing the identification data and the core temperature data.