APPARATUS FOR PHOTOMETRIC ANALYSIS INCLUDING MEANS FOR SCANNING

摘要

A photometric analysis of a specimen is carried out by means of a scanning and integrating apparatus which comprises a main phototube, a specimen holder, driving means for producing relative movement between the main phototube and the specimen holder in accordance with a predetermined scanning path, and an integrator for integrating the electrical output signal from the main phototube. A diaphragm has an aperture which represents a predetermined measuring field. Lamp and lens means are provided for producing an image of the aperture. An auxiliary phototube is provided for registering said image. The driving means are arranged to actuate members for producing a relative movement between said image and said auxiliary phototube, and said relative movement is in accordance with the predetermined scanning path. The auxiliary phototube actuates an electronic gate which switches off the signal from the main phototube to the integrator when the auxiliary phototube does not receive any light from the image of the aperture.