TMP007 datasheet(11/55 Pages) TI

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0.0

0.2

0.4

0.6

0.8

1.0

1.2

4.0

8.0

12.0

16.0

Wavelength (µm)

C005

0.000

0.005

0.010

0.015

0.020

0.025

Wavelength (µm)

450 K

400 K

350 K

300 K

250 K

C019

16 µm

4 µm

TMP007

www.ti.com

SBOS685C – APRIL 2014 – REVISED JULY 2015

Feature Description (continued)

The intensity of radiation from the object is determined by the emisivity (

ε), a material-dependent property that

scales the spectral response so that 0 <

ε < 1. For an ideal black body, the radiation is at a maximum for a given

temperature and

ε = 1. The temperature is measured on the Kelvin scale where 0 K is absolute zero, or

–273.15°C. Room temperature (25°C) is approximately 298.13 K. The emission spectra for objects at or near

room temperature are shown in Figure 17. For these temperatures, the majority of the radiation emitted is in the

wavelength range of 3 µm to 20 µm.

Figure 17. Black Body Emission Spectrum and Response

7.3.1 Spectral Responsivity

The TMP007 is optimized to sense IR radiation emitted by objects from approximately 250 K (–23°C) to 400 K

(127°C), with maximum sensitivity from approximately 4 µm to 16 µm. The relative spectral response of the

TMP007 is shown in Figure 18.

Figure 18. Relative Spectral Response vs Wavelength

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