After the read, you can learn about the 4 mems sensor applications.
The mems sensor is a new type of sensor manufactured by using microelectronics technology and micromechanical production and processing technology.
The mems sensor also refers to the micro-electromechanical system, which is the most cutting-edge research field of multi-discipline that is basically developed in electronic information technology.
After more than 40 years of development, it has become one of the most important cutting-edge technologies in the world. It involves a variety of courses and technologies such as electronic devices, machinery, raw materials, physics, organic chemistry, molecular biology, and medicine, and has broad application prospects.
As of 2010, more than 600 companies around the world have participated in the R&D and manufacturing of mems. They have developed data including small liquid level sensors, instantaneous speed sensors, micro inkjet printer nozzles, and data micromirror displays. Among hundreds of commodities, mems sensors account for a very large proportion.
The mems sensor is a new type of sensor manufactured by using microelectronics technology and micromechanical production and processing technology. Compared with traditional sensors, it has the characteristics of small size, lighter weight, low cost, low functional loss, high stability, suitable for mass production and manufacturing, easy to integrate, and complete intelligent systems.
In addition, the characteristic specifications on the order of μm make it possible to perform functions that cannot be accomplished by traditional mechanical sensors.
Principle of mems sensor
The full name of mems is the mechanical system software of small electronic devices, using traditional semiconductor material processing technology and raw materials, integrating micro-sensors, micro-electric actuators, micro-mechanical organization, signal analysis, and control loops, and integrated components of electronic devices with excellent performance. , Interface, communication, and switching power supply in one small component or system software. It has the characteristics of small volume, low cost, and integration.
Main 4 mems sensor application scenarios
MEMS Sensor Application 1. Medical field
The mems sensor can be used for minimally invasive fetal heart rate testing. It is a highly professional job to test the fetal heart rate, because the fetal heart rate is rapid, in the middle of l20-160 times per minute, using traditional auscultation and even only has a larger effect. Ultrasonic Doppler is difficult to accurately measure with manual counting.
However, the ultrasound Doppler blood pressure monitor with data to show its effect is relatively expensive and is only used in a few hospitals. It has not yet been popularized in China, small and medium-sized hospital outpatient clinics, and many rural areas.
In addition, ultrasonic vibration waves act on the fetus, which will have a very large impact on the fetus. Although the test used is very low, it is also not conducive to the detection range and is not suitable for habitual and repeatable inspections and home scene applications.
MEMS Sensor Application 2. Automotive electronic products
The key application of the mems liquid level sensor is to accurately measure the working pressure of the air tank, the working pressure of gasoline and diesel, the working pressure of the engine oil, the working pressure of the intake port, and the tire pressure.
This type of sensor uses photovoltaic cells as the raw material and uses mems technology to make a force-sensitive pulse damper in the middle of the raw material. Then, the residue is diffused on the pulse damper to produce four-strain force resistors, and then a Wheatstone bridge is used. The circuit method combines strain force resistors into a power supply circuit to achieve high sensitivity.
Auto parts mems liquid level sensor has several common methods such as capacitance sensor, piezoresistive type, differential protection transformer type, surface acoustic wave type, and so on.
The basic principle of the mems acceleration sensor is based on Newton’s basic laws of classical mechanics. It is generally composed of a suspension system and inspection quality. The instantaneous speed inspection is completed according to the deviation of the micro-silicon quality block. The key is the vehicle airbag system software. , Ground anti-skid system software, vehicle navigation, and anti-theft alarm, in addition to capacitive sensors, piezoresistive type, mems acceleration sensors also have piezoelectric, tunnel construction current type, series resonance and thermal resistance, and other methods.
Among them, the capacitive sensor mems accelerometer has the characteristics of high sensitivity and little temperature hazard and is the main product of the micro accelerometer.
The micro gyroscope is an angular velocity sensor, which is mainly used for GPS data signal compensation and a chassis automatic control system for car navigation. The key is vibration type, motor rotor type, and other types.
The most used one belongs to the vibration gyroscope, which uses the Coriolis effect caused by the photovoltaic cell or the vibration mass of the photovoltaic cell when it is pushed and rotated by the base to sense the angular velocity.
For example, when the vehicle is turning, the system software uses the gyroscope to accurately measure the angular velocity to indicate whether the rotation of the steering wheel of the car is accurate. Actively add a moderate braking system to the inner or outer wheel to prevent the vehicle from getting out of the driving lane. Generally, it forms an active control system together with a low acceleration sensor.
MEMS Sensor Application 3. Mobile phone camera industry
Before the mems Drive, mobile phone lenses were anti-shake (commonly known as lens anti-shake technology) by means of a voice coil motor lens group, which suffered from very large limitations.
And another high-end anti-shake technology in the sales market, multi-axis anti-shake, uses a moving optical lens (ImageSensor) to compensate for vibrations, but because this technology is huge and consumes more power than smartphones, I have not been able to use it on mobile phones.
With the improvement in volume and functional loss of micro-electromechanical engineering, the new technical mems Drive is similar to a plan view motor attached to the back of the optical lens to push the image sensor to move on the three rotation axes.
Its anti-shake technology uses the gyroscope to recognize the momentary tremor in the whole process of photography. With the help of high-precision optimization algorithms, it calculates the degree of movement of the motor and makes rapid compensation. These operations need to be completed within one-hundredth of a second so that the image you get is not easily blurred due to vibration.
The mobile phone camera can bring great convenience and speed, but it can deal with the complicated natural environment and various shooting scenarios. The camera cannot prevent shaking, like walking forward, running, lying down and taking pictures, or taking selfies with a mobile phone. No matter what kind of vibration, with the unique five-axis anti-shake of the micro-motor, and the technical advantages of rapid and precise manipulation, it can show clearer photos.
MEMS Sensor Application 4. Fitness tracking system software
In the daily training of the contestants, the mems sensor can be used to carry out accurate measurements of three-dimensional body fitness exercises, to record each posture, and the coaches analyze the results and compare them constantly, which is convenient for improving the test scores of the contestants.
With the further development and improvement of mems technology, the price of mems sensors has gradually decreased, which can also be widely used in mass fitness clubs.
When skiing, the liquid level sensor, instantaneous speed sensor, gyroscope, and GPS in the three-dimensional fitness exercise tracking can enable users to obtain extremely accurate observation capabilities. In addition to the data network that can show skis, they can also be used the location and spacing of the camera are recorded in detail.
The same is true when surfing. The three-dimensional fitness tracking system installed on the surfboard can record the information content of the wave’s aspect ratio, speed, time, paddleboard spacing, water temperature, and heat consumption.
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