門磁開關是一種用于檢測門或窗等物體是否處于開啟或關閉狀態的裝置。它通常由兩部分組成：一部分是磁鐵，安裝在門或窗上；另一部分是感應器，安裝在門框或窗框上。當門或窗關閉時，磁鐵與感應器靠近，感應器會檢測到磁場的變化并輸出相應的信號；而當門或窗打開時，磁鐵與感應器分離，感應器則會輸出不同的信號。這種開關廣泛應用于安防系統、智能家居、工業自動化等領域。例如，在安防系統中，它可以與報警裝置配合使用，當門或窗被非法打開時，觸發報警信號，有效保障人員和財產安全；在智能家居系統中，它可以用于自動控制燈光、窗簾等設備，實現智能化的家居生活。

A door magnet switch is a device used to detect whether a door or window is open or closed. It typically consists of two parts: one is a magnet, which is installed on the door or window; the other is a sensor, which is installed on the door frame or window frame. When the door or window is closed, the magnet approaches the sensor, and the sensor detects the change in the magnetic field and outputs a corresponding signal. Conversely, when the door or window is opened, the magnet moves away from the sensor, and the sensor outputs a different signal. This switch is widely used in security systems, smart homes, and industrial automation. For example, in security systems, it can be used in conjunction with alarm devices to trigger an alarm signal when a door or window is opened illegally, effectively safeguarding people and property. In smart home systems, it can be used to automatically control lighting, curtains, and other devices to achieve an intelligent home life.

接近傳感器是一種非接觸式檢測設備，能夠在一定距離內檢測到物體的存在或接近。它利用電磁感應、電容變化、光學反射等原理來實現檢測功能。接近傳感器具有多種類型，如電感式、電容式、光電式等。電感式接近傳感器主要用于檢測金屬物體，當金屬物體靠近傳感器時，會改變傳感器周圍的電磁場，從而觸發信號輸出。電容式接近傳感器則可以檢測任何導電或非導電的物體，通過檢測物體與傳感器之間的電容變化來工作。光電式接近傳感器利用光線的反射或遮擋來檢測物體，具有高精度和快速響應的特點。接近傳感器廣泛應用于工業自動化生產線、機器人技術、汽車電子等領域。在工業自動化中，它可以用于檢測機械部件的位置，確保設備的精確運行；在汽車電子中，它可以用于自動泊車系統、防碰撞系統等，提高汽車的安全性和便利性。

A proximity sensor is a non-contact detection device that can detect the presence or proximity of an object within a certain distance. It operates based on principles such as electromagnetic induction, capacitive change, or optical reflection. There are various types of proximity sensors, including inductive, capacitive, and photoelectric sensors. Inductive proximity sensors are mainly used to detect metallic objects. When a metal object approaches the sensor, it alters the electromagnetic field around the sensor, triggering a signal output. Capacitive proximity sensors can detect both conductive and non-conductive objects by sensing the change in capacitance between the object and the sensor. Photoelectric proximity sensors use light reflection or obstruction to detect objects and are characterized by high precision and fast response. Proximity sensors are widely used in industrial automation production lines, robotics, automotive electronics, and other fields. In industrial automation, they can be used to detect the position of mechanical components to ensure precise operation of equipment. In automotive electronics, they are used in automatic parking systems, collision avoidance systems, and other applications to enhance the safety and convenience of vehicles.

位移傳感器是一種用于測量物體位置變化或移動距離的傳感器。它能夠將物體的位移量轉換為可測量的電信號，從而實現對物體運動的精確監測和控制。位移傳感器有多種類型，包括線性位移傳感器和角位移傳感器。線性位移傳感器主要用于測量物體在直線方向上的位移，例如在機械加工中測量刀具的進給量或工件的移動距離。角位移傳感器則用于測量物體的旋轉角度，廣泛應用于電機轉速監測、機器人關節角度控制等領域。位移傳感器采用多種測量原理，如電容式、電感式、光電式、磁致伸縮式等。電容式位移傳感器通過檢測電容的變化來測量位移，具有高靈敏度和非接觸測量的特點；光電式位移傳感器利用光的反射或折射原理，能夠實現高精度的位移測量；磁致伸縮式位移傳感器則利用磁致伸縮效應，具有高精度、高可靠性和抗干擾能力強的優點。位移傳感器在工業自動化、航空航天、汽車制造、醫療器械等眾多領域發揮著重要作用。在工業自動化中，它可以用于精確控制機械臂的運動軌跡；在航空航天領域，它可以用于監測飛行器的部件位置和姿態；在汽車制造中，它可以用于檢測汽車零部件的裝配精度；在醫療器械中，它可以用于控制手術器械的精確運動，為醫療診斷和治療提供支持。

A displacement sensor is a device used to measure the change in position or the distance traveled by an object. It can convert the displacement of an object into a measurable electrical signal, thereby enabling precise monitoring and control of the object s movement. There are various types of displacement sensors, including linear and angular displacement sensors. Linear displacement sensors are mainly used to measure the displacement of an object in a straight line direction, such as measuring the feed of a cutting tool or the movement distance of a workpiece in mechanical processing. Angular displacement sensors are used to measure the rotational angle of an object and are widely applied in fields such as motor speed monitoring and robot joint angle control. Displacement sensors employ multiple measurement principles, such as capacitive, inductive, photoelectric, and magnetostrictive. Capacitive displacement sensors measure displacement by detecting changes in capacitance and are characterized by high sensitivity and non-contact measurement. Photoelectric displacement sensors use the principles of light reflection or refraction to achieve high-precision displacement measurement. Magnetostrictive displacement sensors utilize the magnetostrictive effect and offer high precision, high reliability, and strong resistance to interference. Displacement sensors play a vital role in numerous fields, including industrial automation, aerospace, automotive manufacturing, and medical equipment. In industrial automation, they can be used to precisely control the motion trajectory of robotic arms. In the aerospace field, they can monitor the position and attitude of aircraft components. In automotive manufacturing, they can be used to inspect the assembly accuracy of automotive parts. In medical equipment, they can control the precise movement of surgical instruments, providing support for medical diagnosis and treatment.