Instrument for non-contact infrared temperature measurement combined with tachometer functions

• US 7,111,981 B2
• Filed: 08/04/2004
• Issued: 09/26/2006
• Est. Priority Date: 01/06/2004
• Status: Active Grant

• Current Assignee: FLIR Systems, Inc. (Teledyne Technologies Incorporated)
• Original Assignee: Extech Instruments Corporation (Teledyne Technologies Incorporated)
• Inventors: Blakeley, Gerald W. III
• Primary Examiner(s): BENNETT, GEORGE B
• Application Number:
  US10/911,177
• Publication Number:
  US 20050147152A1
• Time in Patent Office: 783 Days
• Field of Search: 374/142, 374/130, 374/120, 374/121, 702/135, 73527-529, 734/88, 356/27, 356/28
• US Class Current: 374/121
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/026 Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
• CPC Class Codes: G01J 5/0265 Handheld, portable ear thermometers G01J5/049
• CPC Class Codes: G01J 5/04 Casings
• 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 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G01P 3/48 by measuring frequency of generated current or voltage in general G01R23/00
• CPC Class Codes: G01P 3/486 delivered by photo-electric detectors

Abstract

A handheld instrument that accomplishes non-contact infrared (IR) temperature measurement, and the measurement of movement of an object. The instrument has a case, and a movement-sensing device coupled to the case and operable to be directed toward or placed against an object being measured, for generating an output signal based on the sensed movement. An IR detector, also carried by the case, senses IR energy emitted from a surface being measured along an IR-sensing axis that extends from the case, and generates an IR output signal. The sensed IR energy is converted to a temperature value, and the output signal from the current-sensing device is converted to at least a measured current value. A display device in the case displays instrument measurements to the user.

Claims

1. A handheld instrument that accomplishes non-contact infrared (IR) temperature measurement and the measurement of movement of an object, comprising:

a case;

a light source carried by the case and adapted to shine light along a light axis from the case onto the object being measured;

a photo detector carried by the case and adapted to capture light shone on and reflected from the object being measured and generating an output signal in response;

a direct movement-sensing device coupled to the case and operable to be placed against an object being measured, the direct movement sensing device comprising a shaft having a distal end, the shaft adapted to be rotated by the object being measured, and further comprising a friction structure coupled to the distal end of the shaft, for placement on the object being measured, the direct movement sensing device generating an output signal based on the sensed movement;

an IR detector carried by the case, for sensing IR energy emitted from a surface being measured along an IR-sensing axis that extends from the case, and generating an output signal;

pulse shaping circuitry for shaping the output of the photo detector and the output of the direct movement sensing device;

means for converting sensed IR energy to a temperature value, and for converting the output signal from the movement-sensing device and the output signal from the photo detector to at least a measured movement value; and

a display device in the case, for displaying instrument measurements to the user.

2. The handheld instrument of claim 1, further comprising an aiming device carried by the case for emitting visible light along an aiming axis, to assist the operator in aiming the IR detector.

3. The handheld instrument of claim 2, wherein the aiming device comprises a laser diode.

4. The handheld instrument of claim 2, wherein the aiming axis is close to the IR-sensing axis.

5. The handheld instrument of claim 4, wherein the aiming axis and the IR-sensing axis are essentially parallel to one another.

6. The handheld instrument of claim 4, wherein the aiming axis and IR-sensing axis are fixed at a slight angle to one another.

7. The handheld instrument of claim 1, wherein the means for converting sensed IR energy to a temperature uses a fixed emissivity value.

8. The handheld instrument of claim 1, wherein the means for converting comprises an analog to digital converter for digitizing the movement-sensing device output signal and the IR output signal.

9. The handheld instrument of claim 1, further comprising means for maintaining a sensed temperature on the display device after the IR detector is no longer aimed at the surface being measured.

10. The handhold instrument of claim 1, further comprising a power source carried within the case, for supplying power to at least the IR detector, the means for converting, and the display device.

11. The handheld instrument of claim 10, wherein the power source comprises a DC power source.

12. The handheld instrument of claim 11, wherein the DC power source comprises a battery.

13. The handheld instrument of claim 1, further comprising switch means to control which signal is displayed.

14. The handheld instrument of claim 1, wherein the display device is a digital display device.

15. The handhold instrument of claim 1, wherein the display device is an analog display device.

16. The handheld instrument of claim 4, wherein the ease has an end, and the aiming axis and the IR-sensing axis both intersect the end of the case.

17. The handhold instrument of claim 1, wherein the photo detector has a sensing axis that is essentially parallel to the light axis.