使用被動(dòng)式紅外傳感器作運(yùn)動(dòng)探測(cè)器時(shí)的設(shè)計(jì)考慮

　　運(yùn)動(dòng)探測(cè)器已經(jīng)持續(xù)監(jiān)視我們十多年了。這些無(wú)處不在的熱釋電眼睛可以檢測(cè)到從小偷闖入你的房子到顧客進(jìn)入超市的一切。

　　早期設(shè)計(jì)不可靠。以傳感器為基礎(chǔ)的自動(dòng)照明，例如，往往會(huì)超時(shí)，讓你在黑暗中嘗試雜技演習(xí)重新觸發(fā)，并使光回來(lái)。但是更好的材料、傳感器、處理器、算法、鏡頭和系統(tǒng)設(shè)計(jì)使運(yùn)動(dòng)探測(cè)器更加實(shí)用，成本更低，而且比過(guò)去更可靠。

　　本文討論的技術(shù)和設(shè)計(jì)背后的被動(dòng)紅外（PIR）探測(cè)器，它考慮的是在幾乎每一個(gè)低成本的運(yùn)動(dòng)檢測(cè)系統(tǒng)的心臟。它將審查可用的檢測(cè)器的類型，檢查它們的問(wèn)題和好處，并為成功地將運(yùn)動(dòng)檢測(cè)功能添加到您的設(shè)計(jì)中提供必要的設(shè)計(jì)提示。。

　　The pyroelectric effect

　　The pyroelectric effect was first documented in Greece in 314 BC， when it was observed that when heated， tourmaline attracted bits of straw and ash. This was re-discovered in the 18th century and the phenomenon was attributed to electricity， but without an understanding as to how. Continued research in the 19th century by Pierre Curie and Jacques Curie uncovered the mechanisms behind the pyroelectric effect and a new technology was born.