FLAME-PHOTOMETRIC DETECTOR FOR GAS CHROMATOGRAPHY Russian patent published in 2001 - IPC

FIELD: analytical instrumentation engineering. SUBSTANCE: two optical plates 7 and 8, each plate being cemented from two optical wedges and has spectrum-dividing coats on surface of cementing of wedges and on surface facing proper interference mirror 9 and 10 are placed on optical axis in detector between condenser lens 5 and radiation detector 6. Radiation flux of analyzed components of substances is collected by condenser lens 5 and is directed on to plate 7 where it splits into two beams. One beam carrying radiation with wave length λ₁ is reflected from plate 7 and mirror 9, passes through optical filter 12, is reflected from mirror 10 and plate 8 when shutter 14 is open and hits radiation detector 6. The other beam carrying radiation with wave length λ₂ passes through plate 7, optical filter 11 , plate 8 when shutter 13 is open and hits radiation detector 6. Thus summary signal from both optical channels hits one radiation detector 6. Detector makes it feasible to detect selective signal from one channel when one shutter 13 or 14 is closed. EFFECT: increased sensitivity and selectivity of detector thanks to updating of its optical system. 1 cl