MLX90614ESF-DBB datasheet(37/40 Pages) ETC2

37 / 40 page

MLX90614 family

Single and Dual Zone

Infra Red Thermometer in TO-39

3901090614

Page 37 of 40

Data Sheet

Rev 003

03/Oct/2007

between the sensor package and the sensor die. This is real optical signal that can not be segregated from

the target IR signal and will add errors to the measured temperature.

Thermal gradients with impact of that kind are likely to appear during transient conditions. The sensor used is

developed with care about sensitivity to this kind of lateral phenomena, but their nature demands some care

when choosing place to use the MLX90614 in order to make them negligible.

I measure human body temperature and I often get measurements that significantly differ from the

+37°C I expect.

IR measurements are true surface temperature measurements. In many applications this means that the

actual temperature measured by an IR thermometer will be temperature of the clothing and not the skin

temperature. Emissivity (explained first in this section) is another issue with clothes that has to be considered.

There is also the simple chance that the measured temperature is adequate – for example, in a cold winter

human hand can appear at temperatures not too close to the well known +37°C.

I consider using MLX90614AAA to measure temperature within car compartment, but I am

embarrassed about the Sun light that may hit the module. Is it a significant issue?

Special care is taken to cut off the visible light spectra as well as the NIR (near IR) before it reaches the

sensitive sensor die. Even more, the glass (in most cases) is not transparent to the IR radiation used by the

MLX90614. Glass has temperature and really high emissivity in most cases – it is “black” for IR of interest.

Overall, Sun behind a window is most likely to introduce relatively small errors. Why is it not completely

eliminated after all? Even visible light partially absorbed in the filter of the sensor has some heating potential

and there is no way that the sensor die will be “blind” for that heating right in front of it.

MLX90614ESF-DBB Datasheet(PDF) 37 Page - List of Unclassifed Manufacturers