公开(公告)号：US3697835A

公开(公告)日：1972-10-10

申请号：US3697835D

申请日：1971-05-24

申请人： MEDICOR MUEVEK

发明人： SATORI GYULA

IPC分类号： G01L9/00 ,  G01L13/02 ,  H01G7/00

CPC分类号： G01L13/025 ,  G01L9/0072

摘要： Known capacitive pressure transducers comprise a wheatstone bridge connection in each branch of which there is a capacitance. Two of them are variable while the two others are arranged on a diaphragm in a casing. The chamber of the casing is subdivided by the diaphragm into a pair of compartments and each compartment is arranged for being connected to a system the pressure of which is to be measured. Such arrangement requires considerable space and is intricate to manipulate. Moreover, its output signals are of low level due to only one pair of capacitances being variable. This invention employs four variable capacitances distributed in the individual branches of a Wheatstone bridge connection for which purpose four electrodes are supported on opposite sides of the diaphragm. Further four electrodes are arranged within the casing opposite to the electrodes on the diaphragm. Thus, four variable capacitances are formed which are connected to form a wheatstone bridge connection. Deflections of the diaphragms caused by such pressure entail variations of the bridge capacitances and, thereby output voltage signals of increased strength on the bridge terminals.

摘要翻译： 已知的电容式压力传感器包括在其中存在电容的每个支路中的惠斯通电桥连接。 其中两个是可变的，而另外两个则布置在外壳中的隔膜上。 壳体的腔室被隔膜细分为一对隔室，每个隔室被布置成连接到要测量其压力的系统。 这种布置需要相当大的空间并且操作复杂。 此外，由于只有一对电容是可变的，其输出信号为低电平。 本发明采用分布在惠斯通电桥连接的各个分支中的四个可变电容，为此，四个电极被支撑在隔膜的相对侧上。 另外四个电极布置在壳体内与膜片上的电极相对的位置。 因此，形成四个可变电容，其连接形成惠斯通电桥连接。 由这种压力引起的隔膜的偏移需要桥接电容的变化，从而输出电桥端子上增加的强度的电压信号。