Patent ID: 6625549
Filing Date: 2003-09-23
Classification: G01F

Abstract:
An equipment specifying system, comprising:a flow path for supplying gas to a plurality of pieces of equipment; an ultrasonic propagation signal measuring section for measuring a propagation signal based on a time during which an ultrasonic wave propagates across the flow path; a signal pattern generation section for generating a signal pattern based on a change in the propagation signal; a signal pattern storage section for previously storing a plurality of signal patterns respectively corresponding to the plurality of pieces of equipment; a signal pattern comparison section for comparing the signal pattern generated by the signal pattern generation section with the plurality of signal patterns previously stored in the signal pattern storage section; and an equipment specifying section for specifying currently used equipment among the plurality of pieces of equipment, in accordance with the comparison results obtained by the signal patter comparison section, wherein the ultrasonic propagation signal measuring section is controlled so that a frequency of measuring the propagation signal is increased, in response to a detection of a change in the propagation signal in both a case of a rising edge and a case of a falling edge of the propagation signal.