Micropower RF material proximity sensor

摘要: A level detector or proximity for materials capable of sensing through plastic container walls encapsulating is the sensor. Thus, it can be used in corrosive environments, as well a wide variety applications. An antenna has characteristic impedance which depends on to antenna. RF oscillator, includes and based single transistor Colpitt's configuration, produces an oscillating signal. coupled oscillator signals changes signal caused by The turned off at pulse repetition frequency with low duty cycle conserve power. consists straight monopole about one-quarter wavelength long nominal oscillator. may horizontally disposed very accurately detects fill within material inside reaches