Remote quantitative analysis of materials

Claim 1

In a detection system, the combination comprising: a. a source of intense monochromatic radiation at 3,371 A which is directed to a target, said radiation being in the ultraviolet range; b. trigger circuit means for actuating said monochromatic radiation source in a pulsed mode; c. first means for detecting Raman scattered radiation of different wavelengths which is scattered from said target due to the incident intense monochromatic radiation, said first means comprising radiation separation spectrometer means for receiving and separating Raman scattered radiation of different wavelengths and photomultiplier means for receiving said separated Raman scattered radiation and producing a separate electrical signal in response to each said separated Raman scattered radiation; d. a plurality of sets of integrator means, each said set receiving and integrating one of said electrical signal and providing a plurality of separate output signals for each said separate electrical signal; e. AND gate circuit means coupled to each integrator means for coupling its integrator means to one of said electrical signals; f. means including gate pulse generator means actuated by said trigger circuit means and coupled to said AND circuit means for controlling the interval of integration of said integrator means, the interval of integration of one each of said integrator means of each said set of integrator means being simultaneously controlled by a different gate pulse generator means, the controlled interval provided by each gate pulse generator means being differently spaced in time relative to said pulses of said source; g. indicator means for separately receiving and indicating the magnitude of the said output signals of each of said sets of integrator means; and h. a radiation filter in the path between the target and said first means which transmits said Raman scattered radiation of different wavelengths to said first means and blocks radiation of the same wavelength as the radiation from the source from reaching said first means, said filter including a water solution of 2,7 - dimethyl, 3,6 - diazacyclohepta, and 1,6 diene perchlorate having substantially complete isotropic volume bulk absorption at the wavelength of said radiation and only small absorption of wavelengths of about 3,500 A and longer.