【正文】 測量非導(dǎo)體 電容式傳感器是最經(jīng)常被用來衡量在導(dǎo)電目標位置的變化。當守衛(wèi)關(guān)注感應(yīng)電場時 ，它創(chuàng)建一個 輕微的 錐形 場這 是一個敏感領(lǐng)域的投影。 有些傳感器提供可選 擇的帶寬，以最大限度地提高或分辨率 或響應(yīng)時間。線性誤差通常在百分之方面表示滿量程（％ / FS）的。一個常用靈敏度單畢業(yè)設(shè)計（論文）外文翻 譯 位是 1 V/ mm。一個常見的靈敏度設(shè)置時 V/100 181。 電容描述了有一定距離的兩個導(dǎo)電物體怎樣產(chǎn)生一個電壓差。m relative to the probe. Focusing the Electric Field When a voltage is applied to a conductor, the electric field emanates from every surface. In a capacitive sensor, the sensing voltage is applied to the sensing area of the probe. For accurate 畢業(yè)設(shè)計（論文）外文翻 譯 measurements, the electric field from the sensing area needs to be contained within the space between the probe and the target. If the electric field is allowed to spread to other items—or other areas on the target—then a change in the position of the other item will be measured as a change in the position of the target. A technique called guarding is used to prevent this from happening. To create a guard, the back and sides of the sensing area are surrounded by another conductor that is kept at the same voltage as the sensing area itself. When the voltage is applied to the sensing area, a separate circuit applies the exact same voltage to the guard. Because there is no difference in voltage between the sensing area and the guard, there is no electric field between them. Any other conductors beside or behind the probe form an electric field with the guard instead of with the sensing area. Only the unguarded front of the sensing area is allowed to form an electric field with the target. Definitions Sensitivity indicates how much the output voltage changes as a result of a change in the gap between the target and the probe. A mon sensitivity is 1 V/ mm. This means that for every mm of change in the gap, the output voltage will change 1 V. When the output voltage is plotted against the gap size, the slope of the line is the sensitivity. A system39。m. The amount of noise in the output is directly related to bandwidth. Generally speaking, noise is distributed over a wide range of frequencies. If the higher frequencies are filtered before the output, the result is less noise and better resolution (Figures 8, 9). When examining resolution specifications, it is critical to know at what bandwidth the specifications apply. Capacitive Sensor Operation Part 2: System Optimization Part 2 of this twopart article focuses on how to optimize the performance of your capacitive sensor, and to understand how target material, shape, and size will affect the sensor39。公式如下： 距離 介電常數(shù)面積電容 *? 在典型的電容式傳感應(yīng)用，探針或 傳感 器是導(dǎo)體中的一個 ， 另一個則是測量對象。一種名為 “ 守衛(wèi) ” 的技術(shù)是用來防止這種情況發(fā)生。溫度的變化是 偏移 誤差的主要 因素。 在圖 7中，最壞的情況下誤差為 差距和誤差帶（粗體）是 。這意味著，在 經(jīng)過一段時間后的 任何 瞬間， 輸出 能 有 誤差。 多通道遙感 通常情況下，目標是同時 被多個探頭測量 。 。典型的校準通常保持 對一個值大大低于這一標準的間距。 這種噪聲是電子元器件固有的，可以最小化，但從來沒有消除。 該誤差帶的計算方法是比較 在輸出電壓 和 他們的預(yù)期值 的 具體差距。 在 設(shè)置期間 電容測量系統(tǒng)通常是“ 零 ” ， 從 原來的校準 中 解決了 偏移誤差 。在電容傳感器中，感 應(yīng)