發(fā)布時(shí)間：2019-01-18 21:46

【摘要】：光纖Bragg光柵(Fiber Bragg grating,FBG)因其體積小、質(zhì)量輕、不受電磁干擾、耐腐蝕、復(fù)用能力強(qiáng)、易于組網(wǎng)等優(yōu)點(diǎn),非常適用于航天器結(jié)構(gòu)健康監(jiān)測(cè)領(lǐng)域。本文針對(duì)星載應(yīng)用環(huán)境高精度大容量傳感監(jiān)測(cè)的實(shí)際要求,開展了光纖Bragg光柵傳感解調(diào)系統(tǒng)的研究。分析了空間環(huán)境給光纖傳感解調(diào)系統(tǒng)帶來(lái)的挑戰(zhàn),提出了基于復(fù)合波長(zhǎng)參考的溫度穩(wěn)定光纖Bragg光柵傳感解調(diào)方法,研制了用于星載的傳感解調(diào)系統(tǒng),進(jìn)行了真空下解調(diào)系統(tǒng)的高低溫循環(huán)實(shí)驗(yàn)研究,完成工作如下:1)研制了用于星載環(huán)境下的多通道并行光纖Bragg光柵解調(diào)系統(tǒng),在對(duì)空間環(huán)境特點(diǎn)分析的基礎(chǔ)上,完成了傳感解調(diào)系統(tǒng)的總體設(shè)計(jì),適用于星載的高功率快速窄帶掃描光源、多通道并行探測(cè)光路和波長(zhǎng)參考光路的設(shè)計(jì),一體化的可調(diào)諧濾波器驅(qū)動(dòng)電路、電源電路和光電探測(cè)電路設(shè)計(jì)。系統(tǒng)波長(zhǎng)掃描范圍覆蓋1525nm~1565nm,掃描速度400Hz。2)研究了傳感解調(diào)系統(tǒng)的波長(zhǎng)校正方法,針對(duì)航天應(yīng)用環(huán)境對(duì)解調(diào)系統(tǒng)提出的寬溫適應(yīng)能力要求和快速解調(diào)要求,在對(duì)F-P標(biāo)準(zhǔn)具和乙炔(C2H2)氣室溫度特性分析的基礎(chǔ)上,提出了基于復(fù)合波長(zhǎng)參考的溫度穩(wěn)定傳感解調(diào)方法,使用C2H2氣室最強(qiáng)吸收譜線結(jié)合F-P標(biāo)準(zhǔn)具不同干涉級(jí)次進(jìn)行差別補(bǔ)償;在對(duì)F-P標(biāo)準(zhǔn)具和C2H2氣室波長(zhǎng)校正算法分析的基礎(chǔ)上,進(jìn)行了快速解調(diào)軟件設(shè)計(jì)。3)實(shí)驗(yàn)研究了星載光纖Bragg光柵傳感解調(diào)系統(tǒng)在溫度循環(huán)和真空熱環(huán)境中的性能,實(shí)驗(yàn)結(jié)果顯示解調(diào)系統(tǒng)在0~55℃范圍內(nèi),波長(zhǎng)解調(diào)穩(wěn)定,解調(diào)結(jié)果變化幅度為±1.2pm,標(biāo)準(zhǔn)差0.39pm;解調(diào)系統(tǒng)在高真空、溫度范圍-30℃~50℃的環(huán)境中,實(shí)現(xiàn)了有效的溫度傳感解調(diào)。
[Abstract]:Fiber Bragg grating (Fiber Bragg grating,FBG) is suitable for spacecraft structure health monitoring because of its advantages such as small volume, light weight, no electromagnetic interference, corrosion resistance, strong reusability and easy networking. In order to meet the practical requirements of high precision and large capacity sensing monitoring in spaceborne application environment, the research of fiber Bragg grating sensing and demodulation system is carried out in this paper. In this paper, the challenges brought by the space environment to the fiber optic sensing demodulation system are analyzed, and a temperature-stabilized fiber Bragg grating sensing demodulation method based on complex wavelength reference is proposed, and a spaceborne sensing demodulation system is developed. The experiments of high and low temperature cycle of demodulation system in vacuum are carried out. The work is as follows: 1) A multichannel parallel fiber Bragg grating demodulation system for spaceborne environment is developed. Based on the analysis of the space environment, The overall design of sensor demodulation system is completed, which is suitable for spaceborne high power fast narrow band scanning light source, multi-channel parallel detection optical path and wavelength reference optical path, and integrated tunable filter driving circuit. Power circuit and photoelectric detection circuit design. The wavelength scanning range of the system covers 1525nm / s and the scanning speed 400Hz.2) has studied the wavelength correction method of the sensing demodulation system. Aiming at the requirement of wide temperature adaptability and fast demodulation of the demodulation system proposed by the space application environment, Based on the analysis of temperature characteristics of F-P standard and acetylene (C2H2) chamber, a temperature stable sensing demodulation method based on complex wavelength reference is proposed. The strongest absorption spectrum line of C2H2 chamber and F-P standard were used to compensate for the difference of interference order. Based on the analysis of F-P standard and C2H2 chamber wavelength correction algorithm, a fast demodulation software is designed. 3) the performance of spaceborne fiber Bragg grating sensing demodulation system in temperature cycle and vacuum thermal environment is studied experimentally. The experimental results show that the demodulation system is stable in the range of 0 ~ 55 鈩，

本文編號(hào)：2411158