使用被動式紅外傳感器作運動探測器時的設(shè)計考慮

　　運動探測器已經(jīng)持續(xù)監(jiān)視我們十多年了。這些無處不在的熱釋電眼睛可以檢測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)計不可靠。以傳感器為基礎(chǔ)的自動照明，例如，往往會超時，讓你在黑暗中嘗試雜技演習(xí)重新觸發(fā)，并使光回來。但是更好的材料、傳感器、處理器、算法、鏡頭和系統(tǒng)設(shè)計使運動探測器更加實用，成本更低，而且比過去更可靠。

　　本文討論的技術(shù)和設(shè)計背后的被動紅外（PIR）探測器，它考慮的是在幾乎每一個低成本的運動檢測系統(tǒng)的心臟。它將審查可用的檢測器的類型，檢查它們的問題和好處，并為成功地將運動檢測功能添加到您的設(shè)計中提供必要的設(shè)計提示。。

　　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.