... Location of Disturbances in a Sagnac LoopInterferometer, Proceedings of SPIE, Vol. 838, p. 325, 1987. 42 . E. Udd, Sagnac Distributed Sensor Concepts, Proceedings of SPIE, Vol. 1586, p. 46 ,1991. 43 . ... Proceedings of SPIE, Vol. 9 54, p. 88, 1983. 14. T. E. Clark and M. W. Burrell, Thermally Switched Coupler, Proceedings of SPIE,Vol. 986, p. 1 64, 1988.15. Y. F. Li and J. W. Lit, Temperature Effects of ... prior sections. Both offer the advantages of spectrally basedsensors and have the prospect of rapid in line manufacture. In the case of the fibergrating, the early demonstration of fiber being written...