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普通的小型压阻压力换能器的参考压力腔是开放的,与大气相通,所以当它插入人体和动物内测量压力前,必须先将参考压力腔与导管相连,这样导管的外径就限制了换能器外径的进一步缩小。近年来国外出现了一种新型的小型绝对压力换能器(miniatureabsolute pressure transducer),其参考压力腔是密闭的,参考压力为稳定的低真空,所以就无须用导管连接,这样就可使换能器的
The reference pressure chamber of an ordinary small piezoresistive pressure transducer is open and in communication with the atmosphere so the reference pressure chamber must be connected to the catheter before it is inserted into the body and animal to measure the pressure so that the catheter’s outside diameter is limited The transducer outer diameter is further reduced. In recent years, a new type of miniatureabsolute pressure transducer has appeared in foreign countries. The reference pressure chamber is hermetically sealed and the reference pressure is a stable low vacuum, so there is no need to connect with a conduit, The