Peak-to-Peak and Interference-Order Positioning Joint Demodulation Algorithm for Fiber-Optic Fabry-Perot Sensors

Dongping Wang; Wei Wang; Junying Zhang; Xiongxing Zhang; Haibin Chen; Zilong Guo

doi:10.3788/AOS202242.1628001

Acta Optica Sinica, Volume. 42, Issue 16, 1628001(2022)

Peak-to-Peak and Interference-Order Positioning Joint Demodulation Algorithm for Fiber-Optic Fabry-Perot Sensors

Dongping Wang¹, Wei Wang^1,2、*, Junying Zhang², Xiongxing Zhang², Haibin Chen², and Zilong Guo²

Author Affiliations

¹School of Defense Science and Technology, Xi′an Technological University, Xi′an710021, Shaanxi , China

²School of Optoelectronic Engineering, Xi′an Technological University, Xi′an710021, Shaanxi , China

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Figures & Tables(9)

Fig. 1. Typical structure of fiber-optic FP sensor

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Fig. 2. Reflection spectra of FP sensors with different fineness

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Fig. 3. Flow chart of peak-to-peak (P2P) and interference-order-positioning joint demodulation algorithm

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Fig. 4. Simulation of P2P and interference-order-positioning joint demodulation algorithm. (a) Reflection spectrum for cavity length of 125 μm; (b) cavity lengths corresponding to different interference orders and their deviations from P2P estimated cavity length

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Fig. 5. Experimental setup of cavity length demodulation system for FP sensors

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Fig. 6. Experimental results of P2P and interference-order-positioning joint demodulation algorithm. (a) Reflection spectrum of demodulated by 4th FP sensor; (b) cavity lengths corresponding to different interference orders and their deviations from P2P estimated cavity length

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Fig. 7. Demodulation results of 100 repeated experiments. (a) Demodulation results of P2P method; (b) demodulation results of P2P and interference-order-positioning joint demodulation algorithm

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Table 1. Simulated cavity length demodulation results for FP sensors with cavity lengths of 55-135 μm

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Table 1. Simulated cavity length demodulation results for FP sensors with cavity lengths of 55-135 μm

$L$ /μm	$L_{P 2 P}$ /μm	$Δ L_{P 2 P}$ /nm	$L_{N}$ /μm	$Δ L_{N}$ /nm
55	55.0214	21.4	55.0003	0.3
65	65.0236	23.6	65.0002	0.2
75	74.9745	25.5	74.9998	0.2
85	85.0359	35.9	84.9998	0.2
95	94.9498	50.2	95.0004	0.4
105	104.9428	57.2	104.9995	0.5
115	115.0602	60.2	114.9996	0.4
125	124.9274	72.6	124.9997	0.3
135	134.9018	98.2	134.9996	0.4

Table 2. Demodulation experimental results for FP sensors with cavity lengths of 55-135 μm

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Table 2. Demodulation experimental results for FP sensors with cavity lengths of 55-135 μm

Group No.	$L_{P P A}$ /μm	$Δ L_{P P A}$ /nm	$L_{N A}$ /μm	$Δ L_{N A}$ /nm
1	57.6939	65.8	57.7389	0.4
2	69.4785	51.3	69.5705	0.5
3	78.2213	61.4	78.1849	0.4
4	87.1176	52.6	87.3466	0.7
5	96.7040	113.7	96.7752	0.8
6	103.9930	109.9	103.9064	0.5
7	113.0358	90.0	112.6620	2.3
8	123.8196	98.1	123.6546	0.9
9	130.7285	129.6	130.7694	1.5

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Dongping Wang, Wei Wang, Junying Zhang, Xiongxing Zhang, Haibin Chen, Zilong Guo. Peak-to-Peak and Interference-Order Positioning Joint Demodulation Algorithm for Fiber-Optic Fabry-Perot Sensors[J]. Acta Optica Sinica, 2022, 42(16): 1628001

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Paper Information

Category: Remote Sensing and Sensors

Received: Jan. 26, 2022

Accepted: Mar. 29, 2022

Published Online: Aug. 4, 2022

The Author Email: Wang Wei (wangwei@xatu.edu.cn)

DOI:10.3788/AOS202242.1628001

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