1. An apparatus for measuring Raman radiation from an object, the apparatus comprising: an array having a plurality of detecting elements and a summer; each detecting element being configured to function as a single-photon detector of a Geiger-mode and receive and detect different bands of spectrum of Raman radiation formed in response to at least one optical excitation pulse directed to the object; the detecting elements and/or the summer being configured to receive a command to enable registration of detections in the detecting elements, and to receive a command to disable the registration during or after the Raman radiation; and the summer being configured to register separately the detections of the Raman radiation in at least two detecting elements and integrate the number of detections for presenting data on the object on the basis of the detections.