170133-090-00 本特利 近程传感器模块

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170133090-00

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近程传感器模块/ 170133现场监视器1701

3300系列5和8毫米探头系统长度9米

比例因子/200毫伏/密耳(7.87毫伏/微米)

  近程传感器也被称为“接近度”传感器。接近度传感器其实是泛指一系列用于检测物件距离的传感器，它们共同的特点是在检测过程中都不会接触到物体。接近度传感器有很多种，其工作原理都是透过发射电磁场或光束，并分析反射回来的信号的变化，从而判断被测物件的距离。

传感器最远和最近可侦测的距离叫”额定测量范围”。部份传感器可以通过调整额定测量范围来适应不同的用途。如果调整额定测量范围到一段非常短的距离时，可将它用来作为触摸开关。接近度传感器的特点都是拥有很高的可靠性和很长的使用寿命，这是因为传感器和被测对象之间没有物理接触，所以不存在机械磨损。接近度传感器种类较多，用途也有一定区别，例如电容式传感器适合用于侦测塑胶的物件，而电感式传感器则适用于金属物件。以下是各种常见的接近度传感器:

电容式近程传感器

电容式近程传感器的工作原理:当被测的物体接近传感器时，物体会改变电容式传感器内的介电常数，传感器透过测量这个介电常数就可以计算出物件的距离。但是电容式传感器的反应速度相对较慢，只有10Hz至50Hz的更新频率，但是由于电容式传感器不会被灰尘等影响，所以在一些特殊应用中常用来代替光学传感器。典型的电容式传感器额定测量范围大约是10毫米，测量精度达到0.01毫米以内的变化。

光电式接近传感器

光电式接近传感器的工作原理:它本身具有一个光发设器，和一个特殊的光检测器，其次包含了放大器和微处理器。当发射的光从一个被测对象反射回来时，光电检测器就会感应到，传感器就是透过这个方法来侦测物体。发射的光将会调制到一个特定的频率上，而检测器拥有一个频率敏感的放大器，只会响应调制在相应频率上的光，这就可以防止灯或阳光对测量结果造成的误差。当光电式接近传感器感应到黑色物体时，黑色物体的不反光的特性将使传感器无法正常工作，当遇到透明或折射光线的物件时情况也是一样的。如夏普2YOA21。

声波接近传感器

声波接近传感器的工作原理同声纳一样，都由振荡器产生脉冲信号，这个信号频率高于人类听觉的范围，这个脉冲信号通过被测物体被反射回传感器，然后通过检测发送信号和接收信号之间的延迟时间，就可以计算出被测物体的距离。发射的脉冲信号是经过特殊编码的，这样可以防止相邻脉冲信号之间的干扰。如:KS103、HC-SR04、SRFO2。

概括而言接近度传感器只是一系列传感器的统称，其所包含传感器的原理、外型及用途都各有不同，甚至有一部份大家可能都在使用，但是或许你并不知道原来这就是接近度传感器。接近度传感器用途极为广泛，对工业生产来说更是一个重要的工具，不少生产工序都依靠接近度传感器来进行检验效正等，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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