摘要:

Piezo/pyroelectric films are capable of generating electrical signals in response to mechanical stress or heat flow, making them the equivalent of a capacitor connected in parallel with a leakage resistor and current source. The piezo- and pyroelectric coefficients, and electrical and thermal time constants of such films can be useful in the design of medical sensors. The author describes three electronic interface circuits: a voltage follower, current-to-voltage converter, and charge-to-voltage converter. Applications for such transducers include a contact microphone, strain-gauge plethysmograph, respiration monitor, thermal imaging sensor, “instant” thermometer, and a thermal scanner.

ISSN:0363-8855    

出版商:OVID    

年代:1988

数据来源: OVID

摘要:

A system was designed to monitor and display the temperature of thirteen refrigerators in the hospital's clinical laboratory. The system includes programmable high and low alarms, a panel meter to display temperature, yellow light-emitting diodes (LEDs) for refrigerator indication, red LEDs for high alarms, and green LEDs for low alarms. The system presented here has been in operation for over three years and has been shown to be reliable, inexpensive, and useful for periodic data collection.

ISSN:0363-8855    

出版商:OVID    

年代:1988

数据来源: OVID