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Huaqiang Security Network News ]
China Security Network Xiaobian This article introduces you to two aspects of the sensor, one is the principle of the sensor, but the application of the sensor.
Principle of sensor and principle of application
A sensor converts some form of energy into another form of energy. There are two types: active and passive. Active sensors can convert one form of energy directly into another without the need for an external source of energy or excitation.
A passive sensor cannot directly convert an energy form, but it can control the energy or excitation energy input from another input, and the sensor undertakes the task of converting a particular characteristic of an object or process into a quantity. The "objects" may be solids, liquids or gases, and their state may be static or dynamic (ie, process). Object properties can be detected in a variety of ways after being quantized by conversion. The characteristics of an object can be either physical or chemical. According to its working principle, it converts the object characteristics or state parameters into measurable electrical quantities, and then separates the electrical signals and sends them to the sensor system for evaluation or labeling.
The principle structure of the sensor is attached to a special elastic shaft to attach a special torque measuring piece and form a variable bridge, which is the basic torque sensor; fixed on the shaft: (1) secondary coil of energy toroidal transformer, (2) signal The primary transformer of the toroidal transformer, (3) the printed circuit board on the shaft, and the circuit board includes a rectified stable power supply, an instrument amplification circuit, a V/F conversion circuit, and a signal output circuit. Fixed on the sensor housing:
(1) excitation circuit, (2) primary coil (input) of energy toroidal transformer, (3) signal toroidal transformer secondary coil (output), (4) signal processing circuit
Sensor principle and application of application
The application of sensors in mobile phones: gravity sensors, which have almost perfect performance in games such as Need for Speed ​​and Everyday Parkour; acceleration sensors, such as the shake function of mobile phones, sense the acceleration of mobile phones; light sensors, such as mobile phones. Automatic dimming function; distance sensor, for example, when the phone is connected to the phone, the phone leaves the ear and the screen becomes brighter, and the phone is black near the ear screen. There are so many sensors in the mobile phone, many of which are implemented using sensors, which are not listed here.
In addition to mobile phones, sensors also have a wide range of applications in daily life, such as: automatic doors, through the sensing of the human body infrared microwave to control its switch state; smoke alarm, through the sensing of smoke concentration to achieve alarm The purpose; electronic scales, through mechanical sensing to measure the weight of people or other items; water level alarms, temperature alarms, humidity alarms, etc. also use sensors to complete their functions.
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