What You Need to Know to Choose an Accelerometer

　　What You Need to Know to Choose an Accelerometer

　　簡(jiǎn)單地說(shuō)，加速器是一種機(jī)電裝置，用來(lái)測(cè)量重力或運(yùn)動(dòng)隨時(shí)間而引起的速度變化或加速度的變化。無(wú)論是傳感方向和振動(dòng)，還是檢測(cè)到它附著的物體的運(yùn)動(dòng)速度，選擇加速度計(jì)都需要考慮多種因素。

　　加速度計(jì)有著廣泛的應(yīng)用。當(dāng)用于航空航天時(shí)，高靈敏度的加速度計(jì)被用作慣性導(dǎo)航系統(tǒng)部件。在工業(yè)環(huán)境中，他們經(jīng)常檢測(cè)和監(jiān)測(cè)旋轉(zhuǎn)機(jī)械的振動(dòng)。我們?nèi)粘Ｉ钪凶钍煜さ氖俏覀兊钠桨?a href='http://www.ttokpm.com/v/tag/1247/' target='_blank' class='arckwlink_none'>電腦、數(shù)碼相機(jī)、游戲和智能手機(jī)，以確保屏幕圖像處于直立狀態(tài)。

　　那么，你怎么知道選擇哪種加速度計(jì)呢？有很多問(wèn)題要回答，從你的設(shè)計(jì)要求開(kāi)始：

　　你需要模擬還是數(shù)字？

　　你需要單軸還是多軸？

　　揮桿水平是多少？

　　你需要高度敏感還是中檔？

　　什么樣的帶寬？

　　你檢查過(guò)阻抗和緩沖嗎？

　　The choice between analog and digital is dictated by the hardware used. Analog accelerometers have an output that is a continuous voltage proportional to the acceleration. Digital accelerometers typically use pulse width modulation so that there is a square wave at a certain frequency. In this case， the time period of high voltage is proportional to the amount of acceleration.

　　The question becomes， what are you using in your design？ A BASIC Stamp module from Parallax or a microcontroller with digital inputs will require a digital output accelerometer; when using a completely analog-based circuit， analog is usually the best choice.