FBG光纖光柵

光纖光柵是利用摻雜光纖的光致折射率變化特性,用特殊工藝使得光纖纖芯的折射率發(fā)生永久性周期變化而形成的一種反射型光纖無(wú)源器件。當(dāng)寬帶光波通過(guò)光纖光柵時(shí),對(duì)滿足Bragg條件的入射光產(chǎn)生強(qiáng)烈的反射,并沿原傳輸光纖返回,而其它波長(zhǎng)的光波可以無(wú)損耗的通過(guò)。透射過(guò)去的其它波長(zhǎng)光波可以繼續(xù)傳輸給其它具有不同中心波長(zhǎng)的光纖光柵陣列,其中相應(yīng)中心波長(zhǎng)的窄帶光系列將被逐一反射,全部沿原傳輸光纖返回,由此可實(shí)現(xiàn)多個(gè)光纖光柵傳感器的波分復(fù)用,實(shí)現(xiàn)準(zhǔn)分布式測(cè)量。其測(cè)量原理如圖1所示:

被反射回來(lái)光波的中心發(fā)射波長(zhǎng)值隨光纖光柵所受環(huán)境溫度和應(yīng)力的變化而變化,并具有良好的線性關(guān)系,實(shí)現(xiàn)了溫度信息的光波長(zhǎng)絕對(duì)編碼,而對(duì)光波信號(hào)的光強(qiáng)度變化不敏感,因此,采用光纖光柵作為溫度敏感元件可以獲得較高的測(cè)量精度,并具有良好的可靠性和穩(wěn)定性?；诖?，基于光纖光柵傳感技術(shù)的溫度實(shí)時(shí)監(jiān)測(cè)系統(tǒng)在溫度和應(yīng)變測(cè)量領(lǐng)域中倍受青睞。

特點(diǎn):

靈敏度高、動(dòng)態(tài)范圍大、不受電磁干擾、穩(wěn)定性好、體積小、使用靈活、易于同光纖集成、可靠性高、成本低、可埋入智能結(jié)構(gòu)等

應(yīng)用:

土木工程、水壩、飛行器、電力、礦山、油田、艦艇及海上平臺(tái)等

Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by F-tone Networks before they become applicable to any particular order or contract. In accordance with the F-tone Networks policy of continuous improvement specifications may change without notice.

The publication of information in this data sheet does not imply freedom from patent or other protective rights of F-tone Networks or others. Further details are available from any F-tone Networks sales representative.