An apparatus for measuring Raman radiation from an object, the apparatus comprising: a summer and an array of application-specific integrated circuits each circuit comprising a photodiode detecting element (2060 to 2064); a wavelength disperser configured to receive Raman radiation from the object and to direct different bands (210 to 214) of a spectrum of Raman radiation to different detecting elements (2060 to 2064); each detecting element (2060 to 2064) being configured to function as a single-photon detector in Geiger-mode and to receive and detect a different spectral band (210 to 214) of Raman radiation from the wavelength disperser formed in response to at least one optical excitation pulse directed to the object; a controller for providing commands; each detecting element (2060 to 2064) being configured to enable detection of detections in the detecting element (2060 to 2064) on receiving a command from the controller to enable detection and to disable the detection during or after the Raman radiation on receiving a command from the controller to disable detection; the summer being configured to enable registration in the summer of detections in the detecting elements (2060 to 2064) on receiving a command from the controller to enable registration and to disable the registration in the summer during or after the Raman radiation on receiving a command from the controller to disable registration; the commands to each of the detecting elements (2060 to 2064) and the summer defining a time window of a measuring state which is shorter than 500 ps; the summer being configured to register separately the detections of the Raman radiation in each of the at least two detecting elements (2060 to 2064) and to respectively sum the number of the detections in each of the at least two detecting elements (2060 to 2064) during the time window; and a signal processing unit to present data on the object on the basis of the summed detections in the different detecting elements (2060 to 2064). a summer and an array of application-specific integrated circuits each circuit comprising a photodiode detecting element (2060 to 2064); a wavelength disperser configured to receive Raman radiation from the object and to direct different bands (210 to 214) of a spectrum of Raman radiation to different detecting elements (2060 to 2064); each detecting element (2060 to 2064) being configured to function as a single-photon detector in Geiger-mode and to receive and detect a different spectral band (210 to 214) of Raman radiation from the wavelength disperser formed in response to at least one optical excitation pulse directed to the object; a controller for providing commands; each detecting element (2060 to 2064) being configured to enable detection of detections in the detecting element (2060 to 2064) on receiving a command from the controller to enable detection and to disable the detection during or after the Raman radiation on receiving a command from the controller to disable detection; the summer being configured to enable registration in the summer of detections in the detecting elements (2060 to 2064) on receiving a command from the controller to enable registration and to disable the registration in the summer during or after the Raman radiation on receiving a command from the controller to disable registration; the commands to each of the detecting elements (2060 to 2064) and the summer defining a time window of a measuring state which is shorter than 500 ps; the summer being configured to register separately the detections of the Raman radiation in each of the at least two detecting elements (2060 to 2064) and to respectively sum the number of the detections in each of the at least two detecting elements (2060 to 2064) during the time window; and a signal processing unit to present data on the object on the basis of the summed detections in the different detecting elements (2060 to 2064).