| 摘要 |
PURPOSE:To enable quantitative determination of trace components in the atmospheric air, air polluting materials, etc. and investigation of the daily change, seasonal change, and yearly change thereof by inputting the gate pulse outputed from a gate pulse generating circuit and an output signal to a gate circuit, and determining quantitatively a light absorptive body by the 1st signal corresponding to the 1st light and the 2nd signal corresponding to the 2nd light. CONSTITUTION:The light from a light source 11 passes 12-13-14-18 for about 3sec as a wing-type chopper 21. Said light enters a detector 23 and thereafter the light passed through 16-15b-17 for about 3sec is reflected by the chopper 21 and is inputted to a detector 23. The light I0, I emitted from the light source 11 are thus conducted alternately at the suitable repetitive period by the chopper 21 to the detector 23. A reference signal made by a photointerruptor 20 is utilized and a square wave signal 105 is formed by a monostable circuit M1 and a high accuracy gate pulse generating circuit M3. Said signal is used as a control signal for addition. A square wave signal 106 is similarly formed by a monostable circuit M2 and the circuit M3 and said signal is used as a control signal for subtraction. |
