System and method for active cancellation of pressure pulses
A pressure and differential pressure technology, applied in the field of gas concentration measurement and monitoring, which can solve problems such as poor measurement accuracy
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[0018] In RGM, the flow of breathing gas is usually regulated to a relatively constant rate to avoid transient distortions of the gas concentration record (ie, waveform). This flow regulation is often accomplished by introducing a compressor (such as an orifice or capillary) into the gas flow path and controlling the pump drive level to be controlled to maintain a constant pressure drop across the compressor. Since pressure drop is a direct function of flow rate, maintaining a constant pressure drop produces a constant flow rate. However, in the case of pump-induced pressure pulsations, the magnitude of the pulsations in the pressure drop can be large and can even exceed the magnitude of the flow-induced pressure drop, which can be problematic for the accuracy of flow rate measurement and control.
[0019] Another problem potentially introduced by pressure pulsations in the sample line is that pressure pulsations appear on the gas sample in the measurement region of the RGM. ...
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