170133-090-00 本特利 近程傳感器模塊
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170133090-00
制造商已停產(chǎn)
近程傳感器模塊/ 170133現(xiàn)場(chǎng)監(jiān)視器1701
3300系列5和8毫米探頭系統(tǒng)長(zhǎng)度9米
比例因子/200毫伏/密耳(7.87毫伏/微米)
近程傳感器也被稱為“接近度”傳感器。接近度傳感器其實(shí)是泛指一系列用于檢測(cè)物件距離的傳感器，它們共同的特點(diǎn)是在檢測(cè)過(guò)程中都不會(huì)接觸到物體。接近度傳感器有很多種，其工作原理都是透過(guò)發(fā)射電磁場(chǎng)或光束，并分析反射回來(lái)的信號(hào)的變化，從而判斷被測(cè)物件的距離。
傳感器最遠(yuǎn)和最近可偵測(cè)的距離叫”額定測(cè)量范圍”。部份傳感器可以通過(guò)調(diào)整額定測(cè)量范圍來(lái)適應(yīng)不同的用途。如果調(diào)整額定測(cè)量范圍到一段非常短的距離時(shí)，可將它用來(lái)作為觸摸開(kāi)關(guān)。接近度傳感器的特點(diǎn)都是擁有很高的可靠性和很長(zhǎng)的使用壽命，這是因?yàn)閭鞲衅骱捅粶y(cè)對(duì)象之間沒(méi)有物理接觸，所以不存在機(jī)械磨損。接近度傳感器種類較多，用途也有一定區(qū)別，例如電容式傳感器適合用于偵測(cè)塑膠的物件，而電感式傳感器則適用于金屬物件。以下是各種常見(jiàn)的接近度傳感器:
電容式近程傳感器
電容式近程傳感器的工作原理:當(dāng)被測(cè)的物體接近傳感器時(shí)，物體會(huì)改變電容式傳感器內(nèi)的介電常數(shù)，傳感器透過(guò)測(cè)量這個(gè)介電常數(shù)就可以計(jì)算出物件的距離。但是電容式傳感器的反應(yīng)速度相對(duì)較慢，只有10Hz至50Hz的更新頻率，但是由于電容式傳感器不會(huì)被灰塵等影響，所以在一些特殊應(yīng)用中常用來(lái)代替光學(xué)傳感器。典型的電容式傳感器額定測(cè)量范圍大約是10毫米，測(cè)量精度達(dá)到0.01毫米以內(nèi)的變化。
光電式接近傳感器
光電式接近傳感器的工作原理:它本身具有一個(gè)光發(fā)設(shè)器，和一個(gè)特殊的光檢測(cè)器，其次包含了放大器和微處理器。當(dāng)發(fā)射的光從一個(gè)被測(cè)對(duì)象反射回來(lái)時(shí)，光電檢測(cè)器就會(huì)感應(yīng)到，傳感器就是透過(guò)這個(gè)方法來(lái)偵測(cè)物體。發(fā)射的光將會(huì)調(diào)制到一個(gè)特定的頻率上，而檢測(cè)器擁有一個(gè)頻率敏感的放大器，只會(huì)響應(yīng)調(diào)制在相應(yīng)頻率上的光，這就可以防止燈或陽(yáng)光對(duì)測(cè)量結(jié)果造成的誤差。當(dāng)光電式接近傳感器感應(yīng)到黑色物體時(shí)，黑色物體的不反光的特性將使傳感器無(wú)法正常工作，當(dāng)遇到透明或折射光線的物件時(shí)情況也是一樣的。如夏普2YOA21。
聲波接近傳感器
聲波接近傳感器的工作原理同聲納一樣，都由振蕩器產(chǎn)生脈沖信號(hào)，這個(gè)信號(hào)頻率高于人類聽(tīng)覺(jué)的范圍，這個(gè)脈沖信號(hào)通過(guò)被測(cè)物體被反射回傳感器，然后通過(guò)檢測(cè)發(fā)送信號(hào)和接收信號(hào)之間的延遲時(shí)間，就可以計(jì)算出被測(cè)物體的距離。發(fā)射的脈沖信號(hào)是經(jīng)過(guò)特殊編碼的，這樣可以防止相鄰脈沖信號(hào)之間的干擾。如:KS103、HC-SR04、SRFO2。
概括而言接近度傳感器只是一系列傳感器的統(tǒng)稱，其所包含傳感器的原理、外型及用途都各有不同，甚至有一部份大家可能都在使用，但是或許你并不知道原來(lái)這就是接近度傳感器。接近度傳感器用途極為廣泛，對(duì)工業(yè)生產(chǎn)來(lái)說(shuō)更是一個(gè)重要的工具，不少生產(chǎn)工序都依靠接近度傳感器來(lái)進(jìn)行檢驗(yàn)效正等，所以它非常有用!
Short-range sensors are also known as "proximity" sensors. Proximity sensors are actually a series of sensors used to detect the distance of objects, and their common feature is that they will not touch the object during the detection process. There are many types of proximity sensors, which work by emitting an electromagnetic field or light beam, and analyzing the changes in the reflected signal to determine the distance of the object being measured.
The farthest and nearest detectable distance of the sensor is called "rated measurement range". Some sensors can be adapted to different applications by adjusting the rated measuring range. It can be used as a touch switch if the rated measuring range is adjusted to a very short distance. Proximity sensors are characterized by high reliability and long service life because there is no physical contact between the sensor and the measured object, so there is no mechanical wear. There are many types of proximity sensors, and there are certain differences in use, such as capacitive sensors for detecting plastic objects, and inductive sensors for metal objects. The following are common proximity sensors:
Capacitive short range sensor
The working principle of capacitive short-range sensor: when the measured object is close to the sensor, the object will change the dielectric constant in the capacitive sensor, and the sensor can calculate the distance of the object by measuring this dielectric constant. However, the reaction speed of capacitive sensors is relatively slow, only 10Hz to 50Hz update frequency, but because capacitive sensors will not be affected by dust, it is often used to replace optical sensors in some special applications. A typical capacitive sensor has a rated measuring range of about 10 mm, with a measurement accuracy of 0.01 mm or less.
Photoelectric proximity sensor
The working principle of the photoelectric proximity sensor is that it has a photogenerator itself, and a special photodetector, followed by an amplifier and a microprocessor. When the emitted light is reflected back from a test object, the photodetector will sense, and the sensor is to detect the object through this method. The emitted light will be modulated to a specific frequency, and the detector has a frequency-sensitive amplifier that will only respond to the light modulated at the corresponding frequency, which prevents errors in the measurement results caused by lamps or sunlight. When the photoelectric proximity sensor senses a black object, the non-reflective nature of the black object will make the sensor unable to work properly, and the same is true when it encounters a transparent or refracted light object. Like the Sharp 2YOA21.
Acoustic proximity sensor
The working principle of the acoustic proximity sensor is the same as that of sonar, which is generated by the oscillator pulse signal, the signal frequency is higher than the range of human hearing, the pulse signal is reflected back to the sensor through the measured object, and then by detecting the delay time between the sent signal and the received signal, the distance of the measured object can be calculated. The transmitted pulse signals are specially coded so as to prevent interference between adjacent pulse signals. For example :KS103, HC-SR04, SRFO2.
In general, proximity sensors are just a series of sensors, the principle of the sensors included, the shape and use are different, and even some of us may be in use, but perhaps you do not know that this is the proximity sensor. Proximity sensors are extremely useful, and it is an important tool for industrial production. Many production processes rely on proximity sensors to test positive effects, so it is very useful!
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