Device for measuring the pressure of a gas like medium
First Claim
1. Device for measuring the pressure of a gas-like medium by means of a piezoelectric measuring device, comprising two piezoelectric oscillators (10,11) disposed opposite each other and spaced from each other to define a hollow space therebetween, said piezoelectric oscillators being arranged in a substantially closed system into which a gas to be measured is introduced and wherein a first oscillator (10) is excited and a second oscillator (11) is coupled to the first oscillator (10) by means of a gas buffer which is contained in said hollow space (17) between the oscillators (10,11) and causes said second oscillator (11) to oscillate passively;
- a conduit (16) connecting said hollow space with a remaining gas being measured (Po); and
a reaction oscillator (12) mechanically connected to the first oscillator (10) so that an exciting signal (SR) of said reaction oscillator is applied to and acts at least indirectly on the oscillators (10,11) and on an output signal (S2) of said second oscillator so as to compensate for aging and temperature influences in said closed system.
1 Assignment
0 Petitions
Accused Products
Abstract
A piezoelectric device for measuring the pressure of a gas like medium comprises two oscillators disposed opposite to each other in a substantially closed system by intermediate introduction of the gas to be measured. The measuring is performed by defining a transfer factor from the first piezoelectric oscillator to the second piezoelectric oscillator, whereby the first piezoelectric oscillator is definitely excited and the measuring signal is picked up by the second piezoelectric oscillator.
11 Citations
8 Claims
-
1. Device for measuring the pressure of a gas-like medium by means of a piezoelectric measuring device, comprising two piezoelectric oscillators (10,11) disposed opposite each other and spaced from each other to define a hollow space therebetween, said piezoelectric oscillators being arranged in a substantially closed system into which a gas to be measured is introduced and wherein a first oscillator (10) is excited and a second oscillator (11) is coupled to the first oscillator (10) by means of a gas buffer which is contained in said hollow space (17) between the oscillators (10,11) and causes said second oscillator (11) to oscillate passively;
- a conduit (16) connecting said hollow space with a remaining gas being measured (Po); and
a reaction oscillator (12) mechanically connected to the first oscillator (10) so that an exciting signal (SR) of said reaction oscillator is applied to and acts at least indirectly on the oscillators (10,11) and on an output signal (S2) of said second oscillator so as to compensate for aging and temperature influences in said closed system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a conduit (16) connecting said hollow space with a remaining gas being measured (Po); and
Specification