Minimum Resolvable Temperature Difference

Temperature sensitivity, also called thermal resolution or NETD for a radiation thermometer, is the smallest temperature ehange at the target surface that can be clearly sensed at the output of the instrument. For an imaging system, the term minimum resolvable temperature (MRT) or minimum resolvable temperature difference (MRTD) defines temperature sensitivity but also implies spatial resolution (IFOV). MRTD is expressed as a function of angular spatial frequency. 

Minimum resolvable temperature (difference), MRT(D) - Thermal resolution thermal sensitivity—the smallest temperature difference that an instmment can clearly distinguish out of the noise, taking into account characteristics of the display and the subjective interpretation of the operator. 

Sensitivity - See MRTD, Minimum resolvable temperature difference. 

Modulation transfer function (MTF) How the responsivity varies as smaller and smaller targets are focused on the detector Minimum resolvable temperature difference (MRTD) The minimum temperature difference that we can resolve - this is a function of spatial frequency (small or finely spaced features are harder to resolve than large, widely spaced ones) it combines the noise equivalent temperature difference and the MTF... 

MRTD MRTD (minimum resolvable temperature difference) quantifies how well we can resolve (distinguish) small temperature differences between small or closely spaced features. It is a function of the spatial frequency k. Predicted MRTD(fe) is the NEED divided by the MTE(A ), where the MTF is the total MTF of the system. If we can predict the NEDT and MTF of the components, then we can predict the MRTD of the system. 

Unique targets are required for two other tests of imaging systems The minimum resolvable temperature difference (MRDT) test uses a set of standard four-bar targets, and the triangle orientation determination test uses sets of four triangles. The tests and the associated targets are described in Section 10.5.3. 

Minimum resolvable temperature (MRT) The smallest blackbody equivalent target temperature difference that can be observed temperature sensitivity. (Example MRT = 0.1°C at 25°C temp.)... 

This is sometimes called Minimum Resolvable Differential Temperature (MRdT) or Minimum Resolvable Delta T (MRDT). Do not confuse MRTD with NETD (Noise Equivalent Temperature Difference). 

There are plenty of TOP results for different polymeric materials showing the electric field and temperature dependen-ces. The minimum transit time that can be resolved by the conventional TOP apparatus is in the range of a few tens of nanoseconds. 

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