CPC G01R 33/24 (2013.01) [G01R 33/445 (2013.01); G02B 6/32 (2013.01); G02B 6/4204 (2013.01)] | 20 Claims |
1. A defect centre-based sensor comprising:
instrumentation which includes:
a generator for causing excitation in an active element; and
a detector for measuring a transition in the active element, wherein the generator is an optical source and/or the detector is an optical detector;
an optical waveguide; and
a sensor head in communication with the source and/or the detector via the optical waveguide, the sensor head housing:
the active element having at least one defect centre; and
a signal delivery arrangement arranged to optically couple the optical waveguide to the active element.
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