fotomeetrilised

Fotomeetrilised is a term that refers to methods and techniques used in photometry that involve the measurement of light intensity using photographic plates or film. Essentially, it's the application of photography to quantitative light measurement. Historically, before the widespread availability of electronic light detectors, photographic emulsions were the primary tools for recording and analyzing light.

In photomeetrilised processes, the degree of blackening or density of a developed photographic image is directly related to the amount of light that exposed the emulsion. This relationship is typically established through calibration using light sources of known intensity. By comparing the density of an unknown light exposure to these calibration standards, the intensity of the unknown light could be determined. This was particularly useful for astronomical observations, where faint celestial objects needed to be recorded over long exposure times.

Applications of photomeetrilised techniques extended beyond astronomy. They were used in various scientific fields for measuring light output from sources, analyzing spectra (by measuring the intensity of spectral lines), and even in early forms of imaging for medical or industrial purposes where light intensity was a critical factor. While largely superseded by more sensitive and precise electronic detectors like photomultiplier tubes and CCD cameras, photomeetrilised methods represent an important historical phase in the development of light measurement and optical instrumentation. The principles behind them, such as the relationship between exposure and density, remain fundamental to understanding photographic processes.