| 摘要 |
A crystal self-test circuit is used to self-test either an acoustic emission crystal or a vibration crystal installed onto one of a bearing, a bearing housing, and a machine. A crystal self-test circuit includes a multiplexer IC, which toggles between a pulse injection configuration and a signal collection configuration. In the pulse injection configuration, the multiplexer IC provides signal communication between a crystal self-test input and the sensing emission crystal. In the signal collection configuration, the multiplexer IC provides signal communication between the sensing emission crystal and a signal analyzer. In operation, the multiplexer IC applies a waveform (preferably a square wave) to the sensing emission crystal over a predetermined time period. The multiplexer IC then toggles to collect the output waveform from the sensing emission crystal and forwards the output waveform to the signal analyzer. The output signal can be amplified by a signal amplifier. |
| 主权项 |
1. A self-test circuit for testing a sensing emission crystal, the self-test circuit comprising:
a voltage source; a ground; a controller; a pulse waveform input; an analyzer; and a multiplexer IC having:
a voltage input pin provided in signal communication with said ground,a ground pin provided in signal communication with said ground,a controller input pin provided in signal communication with said controller,a normally open pin provided in signal communication with said pulse waveform input,a common pin provided in signal communication with said sensing emission crystal;a normally closed pin output in signal communication with said analyzer, wherein in operation:
said pulse waveform input provides a waveform to said multiplexer IC,the controller configures said multiplexer IC to pass said waveform to said sensing emission crystal, wherein said waveform is provided in signal communication with said sensing emission crystal,the waveform excites said sensing emission crystal, andthe controller configures said multiplexer IC to pass said waveform emitted from said sensing emission crystal to said analyzer. |
