Sensors convert one form of energy into another. There are two types: active and passive. Active sensors convert one form of energy directly into another without the need for an external source of energy or excitation.
Passive sensors can not directly convert the form of energy, but it can control the energy or excitation from another input, the sensor to undertake the specific characteristics of an object or process into a quantity of work. The "object" can be solid, liquid or gas, and their state can be static or dynamic (i.e., process). The properties of the objects can be detected in a number of ways after they have been converted and quantified. The properties of the object can be physical or chemical in nature. According to its principle of operation, it converts the object characteristics or state parameters into measurable electrical quantities, and then separates this electrical signal and sends it to the sensor system to be evaluated or labeled.
The principle structure of the sensor in a section of the special elastic shaft pasted on the special torsion should be measured and composed of a variable bridge, that is, the basic torque sensor; fixed on the shaft: (1) the secondary coil of the energy toroidal transformer, (2) the primary coil of the signal toroidal transformer, (3) the axis of the printed circuit board, the circuit board contains a rectifier stabilizes the power supply, instrumentation amplification circuits, V / F conversion circuits and signal output circuit. output circuitry. Fixed on the sensor housing:
(1) excitation circuit, (2) energy toroidal transformer primary coil (input), (3) signal toroidal transformer secondary coil (output), (4) signal processing circuit
Working process
Provide the sensor with ± 15V power supply, the crystal oscillator in the excitation circuit generates a square wave of 400Hz, which is generated by the TDA2030 power amplifier. TDA2030 power amplifier that produces AC excitation power supply, through the energy toroidal transformer T1 from the stationary primary coil to the rotating secondary coil, the AC power supply through the shaft rectifier filter circuit to get ± 5V DC power supply, the power supply to do the operational amplifier AD822 power supply; by the reference power supply AD589 and dual-amplifier AD822 composed of high-precision By the reference power supply AD589 and dual operational amplifier AD822 composed of high-precision voltage regulator to produce ± 4.5V precision DC power supply, the power supply both as a bridge power supply, but also as an amplifier and V / F converter power supply. When the elastic shaft is subjected to torsion, the strain bridge detects the mV-level strain signal through the instrumentation amplifier AD620 amplified into 1.5v ± 1v strong signal, and then through the V / F converter LM131 converted into a frequency signal, through the signal toroidal transformer T2 from the rotating primary coil to the stationary secondary coil, and then through the shell of the signal processing circuit filtering, shaping can be obtained with the elastic bearings by the The torque is proportional to the frequency signal, the signal for the TTL level, can be provided to the special secondary instrument or frequency meter display can also be sent directly to the computer processing. Because the rotary transformer dynamic - static ring only a few millimeters of clearance between the zero point, coupled with the sensor shaft are sealed within the metal shell, the formation of an effective shielding, and therefore has a strong anti-interference ability.
Sensor Classification Tilt Sensor
Tilt sensors are widely used in the military, aerospace, industrial automation, engineering machinery, railroad locomotives, consumer electronics, marine vessels and other fields. Pfizer provides domestic users with the world's most comprehensive and professional product solutions and services. We provide more than 500 kinds of servo type, electrolyte type, capacitance type, inductance type, fiber optic type and other principles of inclination sensor.
Acceleration Sensors (Linear and Angular Acceleration)
Subdivided into low-frequency high-precision force-balance servo type, low-frequency low-cost thermal convection type, and medium-to-high-frequency capacitive acceleration displacement sensors. The total frequency response range is from DC to 3000 Hz. Applications include automotive motion control, automotive testing, home appliances, gaming products, office automation, GPS, PDAs, cellular phones, vibration detection, construction instruments, and laboratory equipment.
Infrared Temperature Sensors
Widely used in household appliances (microwave ovens, air conditioners, hoods, hair dryers, toasters, induction cookers, frying pans, heaters, etc.), medical/home thermometers, office automation, portable non-contact infrared temperature sensors, industrial on-site temperature measurement instruments, and power automation. Not only can we provide sensors, modules or complete temperature measurement instruments, but also provide package solutions including optical lenses, ASICs, algorithms, etc. according to users' needs.
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Sensor applicationsThe application areas of sensors involve machinery manufacturing, industrial process control, automotive electronics, communication electronics, consumer electronics and specialized equipment.
① Specialized equipment
Specialized equipment mainly includes medical, environmental protection, meteorological and other fields of application of professional electronic equipment. Currently, the medical field is a huge sales volume of sensors, profits of the emerging market, the field requires sensor parts to miniaturization, low cost and high reliability direction.
② Industrial Automation
Industrial applications such as process control, industrial machinery, as well as traditional sensors; a variety of measurement of process variables (such as temperature, level, pressure, flow, etc.); measurement of electronic characteristics (current, voltage, etc.) and physical quantities (motion, speed, load, and strength), as well as the traditional proximity/location sensors are developing rapidly.
③ Communication electronics
Significant growth in the production of cell phones and cell phones with new features continue to increase to the sensor market opportunities and challenges, color screen cell phones and camera phone market share continues to rise increased the proportion of sensors in the field of application. In addition, ultrasonic sensors used in group phones and cordless phones, magnetic field sensors used in magnetic storage media will see strong growth.
⑤ Automotive industry
The key to the level of electronic control systems in modern cars lies in the number and level of pressure sensors, an ordinary family car is installed about dozens of sensors to nearly a hundred, and the number of sensors on the limousine can be up to more than two hundred, the type is usually up to more than 30 kinds of more than a hundred kinds.