毕业设计帮忙英语翻译

The Application and Development of Photoelectric Sensor Abstract. At present, the application of photoelectric sensors are more and more extensive, it also promotes the development of photoelectric sensors. Photoelectric sensor has simple structure and diversity. It has high precision, fast response, non-contact and other advantages. In this paper, we analyze the principle of photoelectric sensors, introduce the classification of photoelectric, and then highlight introduce the application of photoelectric sensors and the use of the principle of photoelectric sensors, analyze the current and future development of photoelectric sensors. Keywords: Photoelectric sensor, the application of photoelectric sensor, the development of photoelectric sensor. 1 Introduction Photoelectric sensor is the sensor to use the electronic and optical element as the detection component. Photoelectric detection has high precision, fast response, noncontact advantages and so on. The sensor has simple structure, flexible and diverse forms. Therefore, the photoelectric sensor is widely used in the field of control and testing. It can be used to detect the non-electricity which can cause changes in the amount of light, such as light intensity, radiation temperature, gas composition. It can also use light transmission, occlusion, reflection, interference and others to measure a variety of physical quantities, such as object size, displacement, velocity, temperature, etc.. So it is a important and sensitive device which has a very wide application. When using the photoelectric sensor, it doesn✀t directly contact with the measured object and the beam quality is nearly zero, there is no friction in the measurement and almost no pressure on the measured object. Therefore, photoelectric sensors has obvious advantages than other sensors in many applications. However, its drawback is that optical devices and electronic devices are more expensive in some applications, and environmental conditions require higher on the measurement. In recent years, new optoelectronic devices are been emerging, particularly the birth of CCD image sensor, that creates a new field for the further application of photoelectric sensors.2 The Principle of Photoelectric Sensor Photoelectric sensors use photoelectric elements as sensor conversion devices. The principle of photoelectric sensor is to reflect the measured objects changes by light signal, and then convert the light signal into electrical signals by optoelectronic components. Usually the photoelectric sensor is composed by light source, optical access and optical components. The working process of photoelectric sensor is shown in Figure 1. Fig. 1. The working process of photoelectric sensor The role of optoelectronic devices is to convert the optical signal into electrical signal, which is based on the photoelectric effect. Photoelectric effect is a physical phenomenon that the light shines on certain substances and causes the material to change in the electrical characteristics. It can be divided into external and internal photoelectric effect.