问题描述：
英语翻译
当今生活是信息时代,是获取信息和处理信息 ,以及信息应用的时代.传感信息与检测技术的重要性在于它是获得信息并对信息进行一定处理的基础技术,是获取信息和信息加工处理的重要手段之一.
传感与检测技术是一门知识面广、综合程度高、实用性很强的专业课程.它从传感器的基本理论入手,着重讲叙传感器的结构与感测原理,传感器是一个二端口的装置,不同的传感器输入-输出特性不同,同一传感器适应不同的被测信号呈现的特性也有所不同.尤其当被测信号为静态信号时两种状态下,传感器的输入-输出特性完全不同.感测技术在许多新知识里都有应用,以信息的传感、转换、处理为核心,从基本物理概念入手,阐述热工量、机械量、几何量等参数的测量原理及方法.
光电式传感器是将光信号转化为电信号的一种传感器.它的理论基础是光电效应.这类效应大致可分为三类.第一类是外光电效应,即在光照射下,能使电子逸出物体表面.利用这种效应所做成的器件有真空光电管、光电倍增管等.第二类是内光电效应,即在光线照射下,能使物质的电阻率改变.这类器件包括各类半导体光敏电阻.第三类是光生伏特效应,即在光线作用下,物体内产生电动势的现象,此电动势称为光生电动势.这类器件包括光电池、光电晶体管等.光电效应都是利用光电元件受光照后,电特性发生变化.敏感的光波长是在可见光附近,包括红外波长和紫外波长.数字式电子计数器有直观和计数精确的优点,目前已在各种行业中普遍使用.数字式电子计数器有多种计数触发方式,它是由实际使用条件和环境决定的.有采用机械方式的接触式触发的,有采用电子传感器的非接触式触发的,光电式传感器是其中之一,它是一种非接触式电子传感器.采用光电传感器制作的光电式电子计数器.这种计数器在工厂的生产流水线上作产品统计,有着其他计数器不可取代的优点.该例光电触发式电子计数器只有两位数,但通过级联可以扩展为四位,甚至多位.
问题解答：
我来补答
Contemporary life in the information age, is to obtain information and process information, and the era of information application. Sensing the importance of information and detection technology is that it is access to information and to a certain treatment on the basis of information technology, access to information and information processing one important means.
Sensing technology is a wide range of knowledge, comprehensive high, very practical, professional courses. It is from the sensor's basic theory, spoke of the sensor focused on the structure and sensing principle, the sensor is a two-port device, different sensor input - output characteristic is different from the same sensors to adapt to the different characteristics of the signal are different rendering .Especially when the measured signal is a static signal, two state, the sensor input - output characteristics are completely different. Sensing technology has many applications in the new knowledge to information, sensing, conversion, processing core, starting from the basic physical concepts to explain the amount of thermal, mechanical volume, geometric parameters such as the measurement principle and method.
Photoelectric sensors are optical signals into electrical signals to a sensor. It is based on the photoelectric effect. These effects can be divided into three categories. The first is outside the photoelectric effect, that is, illumination, can escape the surface electronic. This effect by using a device made of a vacuum phototube, photomultiplier tubes.The second type is the photoelectric effect, that is, the light irradiation can change the resistivity of material. Such devices include various types of semiconductor photosensitive resistance. The third category is the photovoltaic effect, ie, under the influence of light, the phenomenon of force generated within the object, this force is called photo-emf. Such devices include photovoltaic cells, optical transistors. Photoelectric effect are the use of optoelectronic components by light, the electrical characteristics change.Sensitive in the visible light wavelength is near, including the infrared wavelength and ultraviolet wavelengths. Digital electronic counter has the advantages of intuitive and accurate count, has been widely used in various industries. Digital electronic counter triggered by a variety of counting methods, it is by the actual conditions of use and environmental decisions.Mechanical methods are triggered by contact, have adopted a non-contact electronic sensors triggered, photoelectric sensor is one of them, it is a non-contact electronic sensors. Photoelectric photoelectric sensor made by electronic counters. This counter is in the factory production lines for product statistics, the counter can not be replaced with other advantages. The cases of optical electronic counter triggered only two digits, but can be extended by cascading four, or even many.
