Showing papers on "Sensor node published in 1989"

Smart sensor system for diagnostic monitoring

Abstract: The present invention is a component monitoring system which includes all sensor and plant component monitoring at distributed plant locations close to the sensors which are the source of the signals to be analyzed. Minimally preconditioned analog sensor signals are multiplexed and further conditioned by a sensor signal preprocessor that adjusts the gain and filters the sensor signals before being applied to an analog-to-digital converter controlled by a data acquisition computer. The analog sensor signals are converted into digital samples and stored in a data memory of a digital signal processor using a direct memory access technique. The data acquisition computer also controls the selection of sensors, gain, etc., based on commands from a controller. The digital signal processor, once sufficient sensor data has been collected, performs appropriate processing using known digital signal processing techniques. This processed data is then sent to the controller for analysis to determine plant component condition. The analysis and processing routines can be changed by downloading a new routine from the controller. Once a sensor signal is processed, the controller selects the next sensor by transmitting an appropriate command to the data acquisition computer.

Door sensor system

Abstract: A sensor system for an automatic sliding door employs multiple sensor modules Each of the sensor modules includes both a presence sensor and a motion sensor In addition, each of the sensor units includes switches for adjusting the size of the presence zone, for selecting either a continuous or a triggered scan mode and for selecting an operating phase to prevent interference The sensor units are generally mounted above the threshold of the doorway and their opeations are synchronized to provide both a traffic sensor and a safety sensor for a sliding door system

Sensor system for monitoring acceleration

Abstract: A accelaration sensor system takes hybrid sensor arrangement which includes a low frequency range monitoring sensor and a high frequency range monitoring sensor. Both of the low frequency range monitoring sensor and a high frequency range monitoring sensor are connected to an electric circuit for supplying sensor signals thereof, which electric circuit selectively outputs one of the sensor signals as a sensor output. The electric circuit is set a boundary frequency for switching the low frequency monitoring sensor and the high frequency range monitoring sensor, which boundary frequency is set at a frequency within a frequency range where neither of sensor signals of the low frequency monitoring sensor and the high frequency range monitoring sensor is attenuated.