Symmetric 3 x 3 coupler-based demodulator for fiber optic interferometric sensors

Brown, David A.; Cameron, C.B.; Keolian, Robert M.; Gardner, David L.; Garrett, Steven L.

doi:10.1117/12.50954

Cited by 55 publications

(25 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The time domain orthogonal sampling approach commercially developed by Optiphase Inc. [40] demonstrates a significant leap of demodulation performance from previous methods with main merits of: very high dynamic range (from micro radians to thousands of radians using fringe counting) and minimizing self crosstalk or noise (since without using harmonics pair). Other method of passive demodulation technique is to use symmetrical 3×3 coupler [46,47] (i.e. 120°phase difference of each port), with certain trigonometry operations to linearly resolve phase information.…”

Section: Interferometric-type Fiber Laser Hydrophonementioning

confidence: 99%

Fiber laser based hydrophone systems

et al. 2011

View full text Add to dashboard Cite

We report our recent work on distributed feedback fiber laser based hydrophones. Some issues related to sensitivity, such as fiber laser phase condition, demodulation, and packaging, are also discussed. With the development of appropriate digital signal processing (DSP) techniques and packaging designs, an interferometric-type distributed feedback (DFB) fiber laser hydrophone system with acoustic sensitivity of 58.0 dB·re·μPa·Hz −0.5 at 1 kHz or a minimum detectable acoustic pressure below 800 μPa during field test is attained. We have also investigated an intensity-type DFB fiber laser hydrophone system and its performance.

show abstract

Section: Interferometric-type Fiber Laser Hydrophonementioning

confidence: 99%

Fiber laser based hydrophone systems

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The signal demodulation technique [9] shown in Fig. 2 is different from what Todd et al [5,6] suggested.…”

Section: Measurement Principlementioning

confidence: 88%

Four-element fiber Bragg grating acceleration sensor array

Jiang¹

2008

Optics and Lasers in Engineering

View full text Add to dashboard Cite

“…However, the error is often large. The use of commercially available software to perform the demodulation has been explained in [21]. By using this technique, not only complicated operating circuits are omitted, but also a high demodulating resolution is achieved.…”

Section: The Principle Of Signal Demodulationmentioning

confidence: 99%