High resolution filter-grating spectrometer

Claim 1

A SPECTROPHOTOMETER COMPRISING, IN COMBINATION, RADIATION SOURCE MEANS; MEANS FOR FORMING A BEAM OF RADIATION FROM SAID SOURCE; A PLURALITY OF OPTICAL FILTER MEANS MOUNTED FOR SELECTIVE POSITIONING IN SAID BEAM; MONOCHROMATOR ENTRANCE SLIT MEANS FOR RECEIVING SAID BEAM; COLLIMATOR MEANS POSITIONED TO RECEIVE AND COLLIMATE THE RADIATION FROM SAID ENTRANCE SLIT MEANS; A PLURALITY OF OPTICAL GRATING MEANS; SELECTING MEANS FOR SELECTIVELY, ALTERNATIVELY POSITIONING EACH OF SAID GRATING MEANS IN A SCANNING LOCATION TO RECEIVE SUBSTANTIALLY THE ENTIRE RADIATION BEAM THEREUPON; SCANNING MEANS FOR ROTATING THE SELECTED GRATING THROUGH A SCANNING ANGLE WHILE POSITIONED IN SAID SCANNING LOCATION; MONOCHROMATOR EXIT SLIT MEANS POSITIONED TO RECEIVE SELECTED RADIATION WAVELENGTHS FROM EACH OF SAID GRATING MEANS; AND DETECTOR MEANS IN THE RADIATION FROM SAID EXIT SLIT MEANS RESPONSIVE TO THE INTENSITY OF THE ISOLATED WAVELENGTHS AND FILTER CHANGING MEANS OPERATIVELY CONNECTED TO SELECTIVELY POSITION EACH OF SAID FILTERS IN SAID BEAM, SAID FILTER CHANGING MEANS BEING INTERCONNECTED TO SAID SELECTING MEANS.