this device splits the light beam into a measuring light beam and a reference light beam . 此設(shè)計(jì)把光束分成測(cè)量光束和參化光束。
be different with other botdr systems, the coherent self-heterodyne botdr system uses only one consecutive laser . the light from consecutive laser is divided into two beams, the detecting light and the reference light, by a coupler 與其他的botdr系統(tǒng)分別使用兩臺(tái)激光器不同,自相干外差的布里淵散射分布式光纖傳感系統(tǒng)采用一臺(tái)激光器,經(jīng)耦合器分為兩路光束??探測(cè)光和參考光束。
at the same time, it uses a frequency translator to obtain a frequency shift, which is equal to the brillouin frequency in fiber . then the detecting pulsed light and the cw reference light can coherent . this method greatly improved the system ’ s sensitive and signal to noise ratio ( snr ) 同時(shí)在探測(cè)光路中引入一個(gè)光移頻環(huán)路,使探測(cè)光移頻后再經(jīng)光纖中布里淵頻移,其后向布里淵散射光頻率與參考光束大致相當(dāng),可進(jìn)行相干自外差探測(cè),大大提高了系統(tǒng)的探測(cè)靈敏度以及系統(tǒng)的信噪比。
lighting: n. 1.照明;照明設(shè)備;舞臺(tái)燈光。 2.點(diǎn)火,發(fā)火。 3.(畫中的)明暗分布。 by reference: 傳地址by-reference: 按引用for reference: 備案, 參考; 提交參考;以供參考; 以供參考;以資參考;作為參考資料; 作參考in reference to: 根據(jù); 關(guān)于,就reference: n. 1.(對(duì)委員、審查人等的)委托;委托項(xiàng)目[范圍]。 2.說到,論到,提到。 3.參考;參考書;附注,引證;基準(zhǔn),依據(jù);關(guān)系。 4.(關(guān)于人品、能力等的)查詢,咨詢,詢商;可供查問的人;證明人,介紹人;(身份、能力等的)證明書,介紹書,服務(wù)經(jīng)歷,鑒定書。 5.參看符號(hào)〔如 asterisk[*e], obelisk ?, section§, parallel‖, paragraph π等〕 (=reference marks)。 the commission's terms of reference 委員會(huì)的職權(quán)。 R- was made to me. 提到了我;所指的是我。 You make no reference to your plan in your letter. 你信里沒有提到你的計(jì)劃。 a book of reference=a reference book 參考書。 Who are your references 你的證明人都是誰? bear reference to =have reference to. give a reference to 提到,介紹。 have reference to 和…有關(guān)系。 in reference to 關(guān)于。 load one's pages with references (在著作中)引用大量參考資料[文獻(xiàn)]。 make reference to 說到,涉及,提到;參考;查問;介紹。 with reference to 關(guān)于。 without reference to 不管,不論(without reference to age or sex 無論男女老少)。 vt. 加注,附加注腳;給(書等)列出參考書目[注明資料來源]。 reference no: 參考編號(hào); 證書編號(hào)reference to: 對(duì)…的反映; 提到; 提及,參考with reference to: 關(guān)于..; 關(guān)于,根據(jù); 關(guān)于,有關(guān); 關(guān)于;有關(guān)reference of reference: 基準(zhǔn)的基準(zhǔn)lighting machine lighting machinery: 燈飾壞a approach lighting: 進(jìn)近燈accent lighting: 局部照明; 塑型照明; 重點(diǎn)照明adaptation lighting: 緩和照明; 適應(yīng)照明additional lighting: 輔助照明advanced lighting: 高級(jí)燈光; 高級(jí)光照; 高級(jí)照明advertisement lighting: 廣告照明advertising lighting: 廣告照明aerodrome lighting: 機(jī)場(chǎng)照明afterburner lighting: 加力燃燒室點(diǎn)火airborne lighting: 前燈對(duì)焦aircraft lighting: 飛機(jī)照明airdrome lighting: 飛行場(chǎng)照明airplane lighting: 航空機(jī)照明airport lighting: 機(jī)場(chǎng)燈光; 機(jī)場(chǎng)照明