I. Overview
At present, maternal and child health indicators have been used as sensitive indicators to measure social production and economic development. Most of the health indicators, per capita expectations, baby mortality, and maternal mortality, and other indicators of the premises of China need to be achieved by maternal health care. Now the hospital's routine prenatal examination includes measuring fetal heart, fetal position, amount of blood pressure, weighing weight, surrounding the belly and the height of the uterus. Among them, the detection of the fetal heart rate is a strong technical work. Since the fetal heart rate is very fast, there is only a traditional stethoscope or even an ultrasonic Doppler with the traditional stethoscope, and it is difficult to measure. precise. The ultrasonic Doppler's fetal heart monitor with digital display function, is expensive, only for a few large hospitals, in the middle, small hospitals and the vast rural areas cannot be popularized. In addition, ultrasonic vibration waves act on the fetus, which will have a large adverse effect on the fetus. Although the detection dose is low, it is also desirable to detect, not suitable for recipient, repetitive inspection and household use.
This project is based on VTI's SCA600C13H1G MEMS acceleration sensor, proposes a non-invasive fetal heart detection method, developing a simple and easy to learn, intuitive and accurate clinical diagnosis and pregnant women between fetal heart stethoscope and Doppler fetal monitor Self-test medical auxiliary instruments.
Second, SCA600C13H1G
The SCA600C13H1G silicon capacitor acceleration sensor is made of single crystal silicon and glass. This design guarantees that with the changes in time and temperature, the product has good reliability, accuracy and stability. Its capacitance detection principle is simple and reliable, and it is measured based on two parallel plate spacing. A pair of parallel plates The capacitance and charge storage depends on the spacing and board area between the parallel plates. The sealing structure of the product has lowered the package requirements. Particles or chemicals cannot enter the sensor, thereby ensuring the reliability of the product. The dual capacitors of the product and the symmetry design improve the zero stability, linearity and lateral sensitivity of the product. Typically, the temperature coefficient is less than 0.05 fs / ~ c, and the lateral sensitivity is less than 3%. This new sensor has the following characteristics; compact structures, low power consumption, good reliability, excellent performance.
The VTI's acceleration sensor is made based on the proof 3D MEMS technology. The three-dimensional microelectronic mechanical system (3D-MEMS) is a three-dimensional combination of various technologies that can be machined into three-dimensional structures, and their packages and contacts are easy to install and assemble, and the sensors made of this technique have excellent precision. , Minimal size and extremely low power consumption. A advanced sensor can be made only by a small silicon and can measure the acceleration of three mutually vertical directions.
Third, the principle and composition of system work
The working principle of this sensor system is converted into an analog voltage signal by an acceleration sensor through an acceleration sensor, and a difference between the pre-placed instrument amplifier achieves a difference. A series of intermediate signal processing such as filtering is then performed, and the analog voltage signal is converted into a digital signal with the A / D converter. The analysis process is input to the 8051 microcontroller by the optical isolation device, and finally the output processing result is output.
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1, front amplification circuit
The preamplifier mainly considers noise, input impedance, and common mode suppression than these three effects. , Reading the full text, the technology area
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