| 摘要 |
<p>PURPOSE:To deter the rise in temperature in the device and compensate the effect by an ambient temperature by forming a temperature compensating circuit. CONSTITUTION:A light from a light source 4 is made to be an intermittent light by a rotary sector 9 and transmitted through a measuring cell 1 and reaches a sensor 7 through a filter 6. A detection signal is converted into a signal corresponding to the density of a measured component by a processing circuit 8. In a light-source block 2, the light source 4 and a diode 5 are contained and set. A light-source power supply circuit lowers the voltage of a power source S at a transformer T1, turns the same into a direct current thereafter at a rectifying part RE, makes an integrated circuit IC for a differential-type constant-voltge power source operate and thus gives a voltage Vo subjected to the temperature compensation to the light source 4.</p> |
