Patent ID: 9689729
Date: 2017-06-27
CPC Classifications: A61B,G01F,G01L

Claim:
1. A pressure sensor, comprising: a first pressure detection device configured to detect the pressure of fluid in a pipe line in which the fluid flows; and a second pressure detection device for compensation of a zero point drift configured to detect the pressure of fluid at a position different from a position of the first pressure detection device, wherein the zero point drift of a pressure of the first pressure detection device is compensated by substituting a value of a minimum pressure value obtained from an output of the first pressure detection device with a minimum pressure value obtained from a pulse wave propagation time and a pressure change amount, the pulse wave propagation time representing the time difference propagating between different two portions in the pipe line recorded between the first and second pressure detection devices, the pressure change amount being obtained from the output of the first pressure detection device.