Optical analysis equipment - analyses gas-form substances flowing through channel and incorporates light transmitter on channel side and light receiver on other channel side

摘要

A calibration unit (6) extends through the channel, and a measurement unit (7) also extends through the channel which is open in a part (12) through which the gas-form substances flow when the equipment is used. The light transmitter (25) is fixed and the calibration unit (6) incorporates at least a calibration cell (10) contg. a calibrating medium. The analysis equipment further incorporates a fixed optical arrangment (4, 5, 18, 19) which is arranged to produce simultaneously a first and second light beam from the light transmitter (25). The optical arrangement directs the first beam through the calibration unit towards the light receiver, and directs the second beam through the measurement unit towards the light receiver. A light control unit (20, 21) enables the light receivr selectively to receive either the first or second beams.