MULTIPLE SPECTRUM CHANNEL, MULTIPLE SENSOR FIBER OPTIC MONITORING SYSTEM

摘要

A multiple sensor fiber optic sensing system includes an optical fiber having at least first fiber optic sensors and second fiber optic sensors deployed along its length. In response to an interrogating pulse, the first fiber optic sensors generate responses in a first optical spectrum window, and the second fiber optic sensors generate responses in a second, different optical spectrum window. The responses in the first optical spectrum window are measured in a first optical spectrum channel, and the responses in the second optical spectrum window are measure in a second, different optical spectrum channel and provide simultaneous indications of one or more parameters, such as temperature and pressure, in the environment in which the sensors are deployed.

主权项

1. A method of measuring at least one parameter in a region of interest, comprising:
launching an optical pulse into an optical fiber deployed in a wellbore formed in the region of interest, the optical fiber having a plurality of first fiber optic sensors and a plurality of second fiber optic sensors disposed along its length, wherein each of the first fiber optic sensors generates a first spectral response to the optical pulse in a first optical spectrum window, and wherein each of the second fiber optic sensors generates a second spectral response to the optical pulse in a second optical spectrum window different than the first optical spectrum window; measuring the first spectral responses in a first optical spectrum channel having a first optical bandwidth sufficient for the first optical spectrum window; and measuring the second spectral responses in a second optical spectrum channel having a second optical bandwidth sufficient for the second optical spectrum window, the measured first and second spectral responses providing simultaneous indications of at least one parameter in the region of interest, and the first optical bandwidth being narrower than the second optical bandwidth.