1.電磁輻射的含義

能(neng)量以電磁(ci)(ci)波(bo)的(de)形式通過(guo)空間傳播的(de)現象(xiang)稱(cheng)為(wei)電磁(ci)(ci)能(neng)輻射(she)或(huo)電磁(ci)(ci)輻射(she)。

2.電磁輻(fu)射(she)產生的(de)方式

天然產(chan)生的(de)電磁輻射(she)主要來(lai)自(zi)地球(qiu)的(de)熱輻射(she)太陽的(de)輻射(she)、宇宙射(she)線(xian)和雷電等(deng)；人工產(chan)生的(de)電磁輻射(she)主要來(lai)自(zi)某些電子設(she)備(bei)(bei)和電氣裝置(zhi)的(de)工作系統(tong)，其中(zhong)包(bao)括: (1)高頻(pin)感(gan)應(ying)加(jia)熱設(she)備(bei)(bei); (2)高頻(pin)介質(zhi)加(jia)熱設(she)備(bei)(bei)；(3)短(duan)波、超短(duan)波理療設(she)備(bei)(bei)；(4)微波發射(she)設(she)備(bei)(bei)；(5)無線(xian)電廣播與通訊等(deng)各種射(she)頻(pin)設(she)備(bei)(bei)。

服務名稱(cheng):通(tong)信輻射檢(jian)測

服務項目簡介:

什么是電磁輻射？

電磁(ci)輻(fu)射(she)(she)(she)，變壓器(qi)怎么檢測電磁(ci)場，指(zhi)移動通訊(xun)設施放射(she)(she)(she)出的(de)輻(fu)射(she)(she)(she)。移動通訊(xun)系統(tong)中，空間無(wu)線(xian)信號(hao)的(de)發(fa)射(she)(she)(she)和接收都是(shi)依靠發(fa)射(she)(she)(she)天線(xian)來實(shi)現(xian)的(de)，在傳輸信號(hao)時，發(fa)射(she)(she)(she)塔發(fa)射(she)(she)(she)天線(xian)有一定(ding)強度的(de)電磁(ci)輻(fu)射(she)(she)(she)量。的(de)輻(fu)射(she)(she)(she)方式基本是(shi)這(zhe)樣的(de)，的(de)每一個(ge)(ge)扇區(qu)都有一個(ge)(ge)廣播頻率(lv)，這(zhe)個(ge)(ge)頻率(lv)每天24小時滿功率(lv)發(fa)射(she)(she)(she)，這(zhe)個(ge)(ge)頻率(lv)主要發(fa)射(she)(she)(she)該扇區(qu)的(de)一些信息。其它頻率(lv)主要是(shi)在通話的(de)時候發(fa)射(she)(she)(she)，發(fa)射(she)(she)(she)功率(lv)可根據通話者的(de)遠近自動調節。

廣播頻(pin)率的輻(fu)(fu)射(she)(she)(she)(she)可以看做是(shi)連(lian)續(xu)(xu)輻(fu)(fu)射(she)(she)(she)(she)方式(shi)(shi)(shi)(shi)，其(qi)它頻(pin)率則是(shi)脈(mo)沖式(shi)(shi)(shi)(shi)輻(fu)(fu)射(she)(she)(she)(she)方式(shi)(shi)(shi)(shi)。現在很多(duo)國際研究機(ji)構認為(wei)脈(mo)沖式(shi)(shi)(shi)(shi)輻(fu)(fu)射(she)(she)(she)(she)方式(shi)(shi)(shi)(shi)比連(lian)續(xu)(xu)輻(fu)(fu)射(she)(she)(she)(she)方式(shi)(shi)(shi)(shi)危害更大，但也沒有(you)定(ding)論。即有(you)連(lian)續(xu)(xu)輻(fu)(fu)射(she)(she)(she)(she)又(you)有(you)脈(mo)沖輻(fu)(fu)射(she)(she)(she)(she)。

電場強度概述

電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)強(qiang)(qiang)度(du)是(shi)用(yong)(yong)來(lai)表示電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)的(de)(de)(de)(de)強(qiang)(qiang)弱和方向的(de)(de)(de)(de)物理量(liang)(liang)。實驗表明，在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)中某一(yi)點(dian)(dian)(dian)(dian)，試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)(正電(dian)(dian)(dian)(dian)(dian)(dian)荷(he))在(zai)該(gai)(gai)點(dian)(dian)(dian)(dian)所(suo)受(shou)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)力(li)與(yu)其所(suo)帶(dai)(dai)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)的(de)(de)(de)(de)比(bi)值(zhi)是(shi)一(yi)個與(yu)試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)無關(guan)的(de)(de)(de)(de)量(liang)(liang)。于(yu)是(shi)以(yi)試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)(正電(dian)(dian)(dian)(dian)(dian)(dian)荷(he))在(zai)該(gai)(gai)點(dian)(dian)(dian)(dian)所(suo)受(shou)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)力(li)的(de)(de)(de)(de)方向為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)方向，以(yi)前述比(bi)值(zhi)為(wei)大小(xiao)的(de)(de)(de)(de)矢量(liang)(liang)定義為(wei)該(gai)(gai)點(dian)(dian)(dian)(dian)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)強(qiang)(qiang)度(du)，常用(yong)(yong)E表示。按(an)照(zhao)定義，電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)中某一(yi)點(dian)(dian)(dian)(dian)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)強(qiang)(qiang)度(du)的(de)(de)(de)(de)方向可(ke)用(yong)(yong)試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)(正電(dian)(dian)(dian)(dian)(dian)(dian)荷(he))在(zai)該(gai)(gai)點(dian)(dian)(dian)(dian)所(suo)受(shou)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)力(li)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)方向來(lai)確定;電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)強(qiang)(qiang)弱可(ke)由試(shi)探(tan)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)所(suo)受(shou)的(de)(de)(de)(de)力(li)與(yu)試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)帶(dai)(dai)電(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)的(de)(de)(de)(de)比(bi)值(zhi)確定。試(shi)探(tan)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)應該(gai)(gai)滿足(zu)兩個條件(jian);(1)它(ta)(ta)的(de)(de)(de)(de)線度(du)必須(xu)小(xiao)到可(ke)以(yi)被(bei)看作(zuo)點(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)荷(he)，以(yi)便確定場(chang)(chang)(chang)(chang)中每點(dian)(dian)(dian)(dian)的(de)(de)(de)(de)性質(zhi);(2)它(ta)(ta)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)量(liang)(liang)要足(zu)夠(gou)小(xiao)，使得由于(yu)它(ta)(ta)的(de)(de)(de)(de)置入(ru)不(bu)引起原(yuan)有電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)的(de)(de)(de)(de)重新分布或(huo)(huo)對有源電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)的(de)(de)(de)(de)影響可(ke)忽略不(bu)計。電(dian)(dian)(dian)(dian)(dian)(dian)場(chang)(chang)(chang)(chang)強(qiang)(qiang)度(du)的(de)(de)(de)(de)單(dan)位V/m伏特(te)(te)/米(mi)或(huo)(huo)N/C牛頓/庫侖(這兩個單(dan)位實際上相(xiang)等(deng))。常用(yong)(yong)的(de)(de)(de)(de)單(dan)位還有V/cm伏特(te)(te)/厘米(mi)。