1769-ECR美國AB現(xiàn)貨低價
1769-ECR美國AB現(xiàn)貨低價
☆ 咨詢: 嚴(yán)工
◆ :
&
◆ :
☆
車輛的存在與通過的檢測
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)有高頻電流通過電感時,公路面上就會形成如圖1(a)中虛線所形成的高頻磁場。當(dāng)汽車進(jìn)入這一高頻磁場區(qū)時,汽車就會產(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,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區(qū)時,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)線圈中流動的高頻電流的振幅(本論文所涉及的檢測工作方式)和相位發(fā)生變化,因此,在環(huán)的始端連接上檢測相位或振幅變化的檢測器,就可得到汽車通過的電信號。若將環(huán)狀絕緣電線作為振蕩電路的一部分,則只要檢測振蕩頻率的變化即可知道汽車的存在和通過。
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。
SH3 Wind River Product Renesas Technology America, Inc. Hitachi SH3 ms7709Ase ms7709Ase
SH3 Wind River Product Renesas Technology America, Inc. Hitachi SH3 ms7709Sse ms7709Sse
SH3 Wind River Product Renesas Technology America, Inc. Hitachi SH3 ms7727se ms7727se
SH3 Wind River Product Renesas Technology America, Inc. Hitachi SH3 ms7729se ms7729se
SH3 Wind River Product Renesas Technology America, Inc. Renesas MS7705SE01 VxWorks 5.5.1 BSP for MS7705SE01
SH3 Wind River Product Renesas Technology America, Inc. Renesas MS7710SE01 ms7710se
SH4 Wind River Product Renesas Technology America, Inc. Hitachi SH4 hmse7751 hmse7751
SH4 Wind River Product Renesas Technology America, Inc. Hitachi SH4 ms7750se ms7750se
SH4 Wind River Product Renesas Technology America, Inc. Hitachi SH4 ms7751se ms7751se
SH4 Wind River Product Renesas Technology America, Inc. Renesas MS7750RSE01 ms7750Rse
SH4 Wind River Product Renesas Technology America, Inc. Renesas MS7751RSE01 ms7751Rse
SH4 Uncertified Advanet Inc. Advme7004 VxWorks 5.5.1 BSP for Advme7004
StrongARM Wind River Product In Corporation In SA-110/21285 Evaluation Board (ebsa285) ebsa285
StrongARM Wind River Product In Corporation In SA1110/SA1111 Dev. Platform (assabet) assabet
Toshiba TX49xx Wind River Product Toshiba Corporation RBTX4927 rbtx4927
Toshiba TX49xx Wind River Product Toshiba Corporation RBTX4937 VxWorks 5.5.1 BSP for rbtx4937
Toshiba TX49xx Wind River Product Toshiba Corporation RBTX4938 rbtx4938
Toshiba TX49xx Wind River Product Toshiba Corporation RBTX4939 VxWorks 5.5.1 BSP for rbtx4939
Toshiba TX49xx Wind River Product Toshiba Corporation Toshiba RBTX4951/RBTX4955 rbtx495x
Toshiba TX49xx Not Supported Toshiba Corporation RBTX4925 (RBHMA4300 (GA)) rbtx4925
X86 Wind River Product Commercial Board Vendors Commercial Pentium Board pc486
XScale Wind River Product ADI Engineering ADI BRH 80200 Reference Platform ibrh80200
XScale Wind River Product In Corporation In IXCDP1100 Development Platform ixcpd1100
XScale Wind River Product In Corporation In IXDP425 (In IXP400 Soft. Rel. 1.3-1.5) ixdp425
XScale Not Supported In Corporation In IXDP2401 Development Platform VxWorks 5.5.1 BSP for ixdp2401
XScale Not Supported In Corporation In IXDP2800 Development Platform ixdp2800