| 摘要 |
FIELD: instruments, in particular, automatic control devices for manufacturing. SUBSTANCE: device method involves conversion of capacitance to frequency. To achieve this field photo transistors are used as oscillation circuit capacitance elements which are controlled by light while passive inductance coil is used as inductance of oscillation circuit. This results in possibility to gain negative voltage at drain- drain terminals of field-effect photo transistors when control voltage is applied. This results in generation of electric oscillations in parallel circuit of capacitor-feature impedance on drain-drain terminals of field-effect photo transistors and inductance resistance of passive inductance coil. When light is received by field-effect photo transistors, capacitance constituent of impedance at drain- drain terminals is altered and resonant frequency of circuit is changed. EFFECT: increased sensitivity and increased precision. 1 dwg |
