| 摘要 |
<p>PURPOSE: To locally measure a collected amount of particulate substances by transmitting and receiving a microwave signal through a filter to detect an amount of particulate substances collected on the filter based on a transmission loss, and by displaying a deposit density of the particulate substances. CONSTITUTION: A microwave transmitted from a transmission antenna 20 is passed through a filter 16A, and the microwave damped in response to an amount of particulate substances collected thereby is received by a receiving antenna 30. In a transmitting side, a microwave signal in response to a bias voltage of a bias direct current power source 21 is output by a voltage control oscillator 22, and is input from a diode switch 24 into a reference detector 50 to output a reference signal for expressing expected intensity of the microwave signal. In a receiving side, a received signal of the receiving antenna 30 is input into a signal detector 60 to output a received signal with final intensity. The both signals are input into a comparator 70 and a comparison operation unit 72 in order, and a deposit density of the particulate substances is calculated to be displayed on a display 73.</p> |
