公开(公告)号：US3586441A

公开(公告)日：1971-06-22

申请号：US3586441D

申请日：1967-07-12

Applicant: INSTRUMENTATION LABOR INC

Inventor： SMITH STANLEY BABCOCK ,  ZINDLER JERROLD ,  ARGON RAUF ,  BLACKMER DAVID E

IPC: G01N21/31 ,  G01N21/72 ,  G01J3/42

CPC classification number: G01N21/72 ,  G01N21/3103

Abstract: An atomic absorption spectroanalysis system includes a burner for generating a flame, two radiation sources, and two pairs of radiation sensors. An optical system passes radiation from each source along a first path through the flame for sensing by a corresponding sensor to produce an I signal, and along a second path outside the flame for sensing by a corresponding second sensor to produce an Io signal. The radiation output of each source is modulated and the output signals from each sensor are demodulated and then logarithmically combined to provide two log I/Io signals. Compensation circuitry connected to the logarithmic circuit arrangement provides compensation for radiation absorption deviations of the radiation passing through the flame as a function of Beer''s Law. The system also includes circuitry for providing a zeroing adjustment of each log I/Io signal while a known standard or blank is being introduced into the flame.