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車輛的存在與通過(guò)的檢測(cè)
感應(yīng)線圈(電感式傳感器)
電感式傳感器其主要部件是埋設(shè)在公路下十幾厘米深處的環(huán)狀絕緣電線(特別適合新鋪道路,可用混凝土直接預(yù)埋,老路則需開挖再埋)。當(dāng)有高頻電流通過(guò)電感時(shí),公路面上就會(huì)形成如圖1(a)中虛線所形成的高頻磁場(chǎng)。當(dāng)汽車進(jìn)入這一高頻磁場(chǎng)區(qū)時(shí),汽車就會(huì)產(chǎn)生渦流損耗,環(huán)狀絕緣電線的電感開始減少。當(dāng)汽車正好在該感應(yīng)線圈的正上方時(shí),該感應(yīng)線圈的電感減到zui小值。當(dāng)汽車離開這高頻磁場(chǎng)區(qū)時(shí),該感應(yīng)線圈電感逐漸復(fù)原到初始狀態(tài)。由于電感變化該感應(yīng)線圈中流動(dòng)的高頻電流的振幅(本論文所涉及的檢測(cè)工作方式)和相位發(fā)生變化,因此,在環(huán)的始端連接上檢測(cè)相位或振幅變化的檢測(cè)器,就可得到汽車通過(guò)的電信號(hào)。若將環(huán)狀絕緣電線作為振蕩電路的一部分,則只要檢測(cè)振蕩頻率的變化即可知道汽車的存在和通過(guò)。
電感式傳感器的高頻電流頻率為60khz,尺寸為2×3m,電感約為100μh.這種傳感器可檢測(cè)的電感變化率在0.3%以上[1,2]。
電感式傳感器安裝在公路下面,從交通安全和美觀考慮, 它是理想的傳感器。傳感器選用防潮性能好的原材料。
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