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邦納BANNER測量過量增益實操

什么是過量增益?

過量增益是傳感器可靠檢測所需最小光通量的估計方法。

The light signal that your sensor emits is factory-calibrated to a certain level of performance. However, contaminants in the sensing environment such as dirt, dust, smoke, and moisture, can cause signal attenuation.  Excess gain may be seen as the extra sensing energy available to overcome this attenuation.

測量過量增益
過量增益能夠用如下公式來表達(dá)。

過量增益 =接收器接收到的光能量 /使傳感器動作的閾值。

這個閾值是傳感器的放大器所需求的光能量，使得傳感器的輸出發(fā)作改變，比如從Off切換到On，或許反之。 
過量增益為什么對光電傳感器很重要
An excess gain curve, an important part of every photoelectric sensor specification, is plotted on an x/y axis. It shows the excess gain available for a particular sensor or sensing system, as a function of distance.  Excess gain curves are plotted for conditions of perfectly clean air and maximum receiver gain. 

重要的假定
關(guān)于憑借過量增量值優(yōu)化檢測的可靠性，有幾個假定。

Use as high an excess gain setting as possible, without compromising target detection. In most sensing situations, excess gain correlates directly to sensing reliability.
挑選一款適宜的傳感器，使得其過量增益適合使用需求。
 
excess-gain-charts-polarized-vs-non
曲線: 過量增益曲線，舉例 QS18 光電傳感器 反射板式。 

怎么憑借過量增益挑選最適合的傳感器
過量增益 (EG) 一般情況下
1.5x 潔凈的環(huán)境: 鏡頭、反射板上沒有塵埃 
5x 輕微塵埃: 輕微 堆積 塵埃等，在鏡頭或許反射板上。
10x 中等塵埃的環(huán)境 在鏡頭上有顯著的塵埃等污染，或許 反射板上
50x Very dirty: Heavy contamination on lenses. Heavy fog, mist, dust, smoke, or oil film.  Minimal cleaning of lenses,
假如大體了解檢測的環(huán)境，能夠把過量增益作為參閱，以確保傳感器的光通量不會衰減至無。

這些參閱要素包含，纖細(xì)的檢測變化，例如傳感器沒有對準(zhǔn)，檢測環(huán)境的纖細(xì)變化。

潔凈的環(huán)境 - 1.5X 過量增益 (EG)
For a perfectly clean operating environment, an excess gain of 1.5x (50% more energy than the minimum needed for operation) is suggested. Some environments that have "clean air" are those found in the semiconductor or pharmaceutical industries. In these environments, no dirt builds up on the sensor lenses or retroreflectors.

輕微塵埃的環(huán)境 - 5X 過量增量
An office or a clean factory might be characterized as a "slightly dirty" environment. This means sensor lenses or retroreflectors may experience a slight build-up of dust, dirt, oil, or moisture. Lenses are cleaned on a regular schedule. In a "slightly dirty" environment, the excess gain should be 5 times more than what is minimally required for sensor operation.

一般塵埃的工作環(huán)境 – 10X 過量增益
In a "moderately dirty" environment, obvious contamination can be seen on lenses or retroreflectors. These environments are also likely to have periodic washdowns. "Moderately dirty" environments can be found in heavy industry, food processing, or the automotive industry. For such environments, Banner recommends an excess gain 10 times more than what is minimally required. 
重度塵埃– 50X過量增益
Some environments like those found in foundries, mining operations, tile ovens, and outdoors are considered "very dirty." This is because lenses and retroreflectors become heavily contaminated, and are subject to minimal cleaning. There may be heavy fog, mist, dust, smoke, or oil film in the environment.

然而有一點需求注意，假如過量增益超過50倍，則傳感器可能會穿透紙張或許類似密度的原料。
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