These include mid-IR spectroscopy, fiber optic sensors, thermometry, and imaging. Phosphor thermometry is an optical method for surface temperature measurement. These applications include mid-IR spectroscopy, fiber-optic sensors, thermometry, and imaging. Phosphor thermometry is a temperature measurement approach that uses the temperature dependence of certain phosphors. Radiometric thermometry, in contrast, can be only slightly dependent on the constitutive relations of materials. This permits differences among genotypes to be detected relatively easily using infrared thermometry. His interest in acquiring experimental data spanned several fields&colon; optics, thermometry, pyrometry, hydrometry, and magnetics. In phosphor thermometry, the temperature dependence of the photoluminescence process is exploited to measure temperature. "Thermometry", rather than "tomography", has been used to indicate basin-scale or global scale measurements. In a sense then, radiometric thermometry might be thought of as "universal". On ocean basin scales, this technique is also known as acoustic thermometry. It is the Euclidean relationships which apply directly to thermometry. This effect is utilized in the most widely employed method of thermometry. The practical basis of thermometry is the existence of triple point cells. In 1765 he presented a survey of thermometry up to that date.