Actinometer

The actinometer is a relative measurement device for the direct solar radiation. The actinometer must be calibrated by comparison with an absolute instrument, the pyrheliometer. One older instrument of this kind is the actinometer indicated by WA Michelson.

Actinometer use chemical modifications of certain substances which are used for irradiation to measure the radiation intensity. You use inter alia bimetallic films that bend when exposed so that you can read the intensity on a measuring scale. The Universal actinometer by Franz Linke, in which the receiver consists of a lamella of thin Konstantanblech behind which the active solder joints of a nine -part thermopile mounted manganin - constantan. The second solder joints are thermally and electrically insulated is mounted on both sides of the lamella. The entire apparatus is mounted in an aluminum body and he has a slider on the incidence gap with filter glass, a quartz protection serves as a windbreak. The reading is done with a Drehpulszeigergalvanometer.