Simultaneous distributed measurements on optical fiber

A distributed measurement system, comprising:

• a distributed optical sensing fiber deployed along a desired measurement path;
• a first measuring instrument to generate a first interrogating probe signal to launch into the optical sensing fiber and to acquire first measurement data from backscattered light generated by the distributed optical sensing fiber in response to the first interrogating probe signal;
• a second measuring instrument to generate a second interrogating probe signal to launch into the optical sensing fiber and to acquire second measurement data from backscattered light generated by the distributed optical sensing fiber in response to the second interrogating probe signal;
• and
• an adapter coupled to the first and second measuring instruments and to a first end of the optical sensing fiber,
• wherein the adapter is configured to combine the first and second interrogating probe signals for simultaneous launch into the first end of the sensing fiber, separate the backscattered light generated in response to the combined interrogating probes, and provide a first separated portion of the backscattered light to the first measuring instrument and a second separate portion of the backscattered light to the second measuring instrument.