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風向(xiang)風速儀風速裝置的介紹
風向風速儀(yi)是(shi)農業氣象研究過程*的設備(bei)之一。儀(yi)器采用便(bian)攜式設計(ji),更加符合了流動(dong)監測的需要。對于風速的測量,我們還需要重點的來講解(jie)一下。
風向風速(su)儀(yi)風速(su)傳(chuan)感器(qi)采(cai)用(yong)的(de)(de)(de)是傳(chuan)統的(de)(de)(de)三(san)杯旋(xuan)(xuan)轉架結構。它將風速(su)線性(xing)地變(bian)換成旋(xuan)(xuan)轉架的(de)(de)(de)轉速(su)。為(wei)了減少啟動風速(su),采(cai)用(yong)特制(zhi)的(de)(de)(de)輕質風杯。在旋(xuan)(xuan)轉架的(de)(de)(de)軸(zhou)上固定有一個齒狀的(de)(de)(de)葉片,當(dang)旋(xuan)(xuan)轉架隨(sui)風旋(xuan)(xuan)轉時,軸(zhou)帶動著葉片旋(xuan)(xuan)轉,齒狀葉片在光(guang)電開關(guan)的(de)(de)(de)光(guang)路中不斷切割光(guang)束(shu),從而(er)將風速(su)線性(xing)地變(bian)換成光(guang)電開關(guan)的(de)(de)(de)輸(shu)出脈沖(chong)頻率。
風(feng)(feng)(feng)向風(feng)(feng)(feng)速儀(yi)(yi)內的(de)單(dan)片機對(dui)風(feng)(feng)(feng)傳感器(qi)(qi)(qi)的(de)輸出頻率進行采樣,計(ji)算。最后儀(yi)(yi)器(qi)(qi)(qi)輸出瞬時風(feng)(feng)(feng)速,一分(fen)鐘(zhong)平均風(feng)(feng)(feng)速,瞬時風(feng)(feng)(feng)級,一分(fen)鐘(zhong)平均風(feng)(feng)(feng)級,平均風(feng)(feng)(feng)級對(dui)應的(de)浪高。測(ce)得的(de)參數(shu)在(zai)儀(yi)(yi)器(qi)(qi)(qi)的(de)液晶顯示(shi)器(qi)(qi)(qi)上用(yong)數(shu)字直接顯示(shi)出來。為了減少儀(yi)(yi)器(qi)(qi)(qi)的(de)功耗,儀(yi)(yi)器(qi)(qi)(qi)中的(de)傳感器(qi)(qi)(qi)和單(dan)片機都采取了一些降低(di)功耗的(de)專(zhuan)門措(cuo)施。當電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓太(tai)低(di)時,儀(yi)(yi)器(qi)(qi)(qi)顯示(shi)器(qi)(qi)(qi)下部電(dian)(dian)(dian)(dian)池標記顯示(shi)缺電(dian)(dian)(dian)(dian),提示(shi)用(yong)戶電(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)壓太(tai)低(di)數(shu)據已不可(ke)靠,需要(yao)及時更換電(dian)(dian)(dian)(dian)池。儀(yi)(yi)器(qi)(qi)(qi)內還(huan)設計(ji)有電(dian)(dian)(dian)(dian)源控制電(dian)(dian)(dian)(dian)路,用(yong)電(dian)(dian)(dian)(dian)路來替代機械開關控制儀(yi)(yi)器(qi)(qi)(qi)的(de)投斷電(dian)(dian)(dian)(dian)。