photo- technique (adj.)

in thermal analysis
https://doi.org/10.1351/goldbook.12301
Indicates that the experiment involves the illumination of the sample or measures the amount of light emitted from a sample. Where possible, the wavelength range of the light should be specified.
Source:
PAC, 2014, 86, 545. (ICTAC nomenclature of thermal analysis (IUPAC Recommendations 2014)) on page 548 [Terms] [Paper]