Abstract

Temperature measurement based on pulsed photothermal radiometry is described. In this technique a body is irradiated by a laser pulse and its temperature is inferred from the shape of the emitted photothermal-signal curve. A prototypical system based on a pulsed CO2 laser, an IR detector, and IR-transmitting silver halide optical fibers was constructed and used to evaluate the feasibility of this technique. An important feature of the technique is that changes in sample emissivity or geometric factors do not introduce errors in the temperature determination. Theory, simulation, and experimental results are given and discussed.

© 1998 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. T. Loarer, J. J. Greffet, M. Huetz-Aubert, “Noncontact surface temperature measurement by means of a modulated photothermal effect,” Appl. Opt. 29, 979–987 (1990).
    [CrossRef] [PubMed]
  2. T. Loarer, J. J. Greffet, “Application of the pulsed photothermal effect to fast temperature measurements,” Appl. Opt. 31, 5350–5358 (1992).
    [CrossRef] [PubMed]
  3. O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
    [CrossRef]
  4. E. L. Dereniak, G. D. Boreman, Infrared Detectors and Systems (Wiley, New York, 1996).
  5. A. Zur, A. Katzir, “Use of infrared fibers for low-temperature radiometric measurements,” Appl. Phys. Lett. 48, 499–500 (1986).
    [CrossRef]
  6. A. Zur, A. Katzir, “Fibers for low-temperature radiometric measurements,” Appl. Opt. 26, 1201–1206 (1987).
    [CrossRef] [PubMed]

1997

O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
[CrossRef]

1992

1990

1987

1986

A. Zur, A. Katzir, “Use of infrared fibers for low-temperature radiometric measurements,” Appl. Phys. Lett. 48, 499–500 (1986).
[CrossRef]

Boreman, G. D.

E. L. Dereniak, G. D. Boreman, Infrared Detectors and Systems (Wiley, New York, 1996).

Dereniak, E. L.

E. L. Dereniak, G. D. Boreman, Infrared Detectors and Systems (Wiley, New York, 1996).

Eyal, O.

O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
[CrossRef]

Greffet, J. J.

Huetz-Aubert, M.

Katzir, A.

O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
[CrossRef]

A. Zur, A. Katzir, “Fibers for low-temperature radiometric measurements,” Appl. Opt. 26, 1201–1206 (1987).
[CrossRef] [PubMed]

A. Zur, A. Katzir, “Use of infrared fibers for low-temperature radiometric measurements,” Appl. Phys. Lett. 48, 499–500 (1986).
[CrossRef]

Loarer, T.

Scharf, V.

O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
[CrossRef]

Zur, A.

A. Zur, A. Katzir, “Fibers for low-temperature radiometric measurements,” Appl. Opt. 26, 1201–1206 (1987).
[CrossRef] [PubMed]

A. Zur, A. Katzir, “Use of infrared fibers for low-temperature radiometric measurements,” Appl. Phys. Lett. 48, 499–500 (1986).
[CrossRef]

Appl. Opt.

Appl. Phys. Lett.

A. Zur, A. Katzir, “Use of infrared fibers for low-temperature radiometric measurements,” Appl. Phys. Lett. 48, 499–500 (1986).
[CrossRef]

O. Eyal, V. Scharf, A. Katzir, “Temperature measurements using pulsed photothermal radiometry and silver halide infrared optical fibers,” Appl. Phys. Lett. 70, 1509–1511 (1997).
[CrossRef]

Other

E. L. Dereniak, G. D. Boreman, Infrared Detectors and Systems (Wiley, New York, 1996).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (8)

Fig. 1
Fig. 1

Definition of the photothermal-signal measuring parameters. The inset is a schematic of the PPTR technique.

Fig. 2
Fig. 2

First derivative of Planck’s equation with respect to temperature. The inset describes Planck’s equation versus the wavelength for different blackbody temperatures.

Fig. 3
Fig. 3

Experimental setup. The overall optical spectral response of the system is shown in the inset.

Fig. 4
Fig. 4

Calculated decay times of the photothermal signals versus the temperature of a blackbody target.

Fig. 5
Fig. 5

Decay time t d = t 2 - t 1, as measured by the HgCdTe detector (in this case α1 = 0.8 and α2 = 0.2), versus the temperature T of a blackbody target. Laser-pulse parameters: energy of 33 mJ, pulse duration of 2.5 ms. The inset shows two typical photothermal signals measured by the HgCdTe detector—one measured at a target temperature of 21 °C and the other at 54 °C.

Fig. 6
Fig. 6

Decay time t d 1 = 0.9 and α2 = 0.4) as measured by the InSb detector versus the temperature of a TUFNOL target.

Fig. 7
Fig. 7

Decay time t d 1 = 0.9 and α2 = 0.4) as measured by the HgCdTe versus the fiber-face-to-target distance.

Fig. 8
Fig. 8

Temperature measured according to the peak signal and the decay time versus different surface roughnesses of a TUFNOL target. Laser-pulse parameters: energy of 36 mJ, pulse duration of 3.4 ms. Another measurement is shown in the inset. A change of the target emissivity occurred at the target temperature of 130 °C. In both measurements the advantage of the decay-time measurement over the peak-intensity measurement is obvious.

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

M λ ,   T ,   ε = ε   c 1 λ 4 1 exp c 2 λ T - 1 photons   s - 1   cm - 2   μ m - 1 ,
T t = T 0 + Δ T   exp - t / τ ,
M λ ,   T 0 ,   Δ T ,   t ,   τ ,   ε = ε   c 1 λ 4 1 exp c 2 λ T 0 + Δ T   exp - t / τ - 1 .
λ M λ ,   T T = 0 .
Δ M λ ,   T 0 ,   Δ T ,   t ,   τ = M λ ,   T 0 ,   Δ T ,   t ,   τ - M λ ,   T 0 .
P λ ,   T 0 ,   Δ T ,   t ,   τ ,   ε = λ 1 λ 2   ε Δ M λ ,   T 0 ,   Δ T ,   t ,   τ F λ d λ ,

Metrics