| 摘要 |
FIELD: medicine; instrumentation; mining.SUBSTANCE: novelty in sensor permanent monitoring of miner's heart rhythm is arrangement of sensor inside housing of mining lantern storage battery from its wide wall facing miner's body and making sensor in form of autodyne generator connected to micro-strip antenna and containing, besides, current sensor, narrow-band amplifier of infrasonic frequency, microcontroller with built-in ADC and recipient of information on miner's heart rhythm. Autodyne generator consists of field-effect transistor, blocking capacitor and micro-strip antenna on dielectric substrate with screening plate, which begins to generate oscillations at supply of DC voltage to transistor drain. Autodyne generator is a generator with open oscillating system capable of emitting and receiving electromagnetic oscillations. When excited autodyne generator via micro-strip antenna starts to effectively emit microwave oscillations towards miner's body. Power of these oscillations is small, which absolutely has not effect on miner's health. After reflection from miner's body, oscillations are caught again by micro-strip antenna and combined with their own oscillations of autodyne generator, causing change in current flowing through autodyne DC generator. Current sensor connected to output of power supply of autodyne generator, enables to detect change in these current consumptions, which carry information on miner's heart rhythm. Infrasonic frequency narrow-band amplifier selects and intensifies these current changes in frequency range of 0.8-2.5 Hz, corresponding to miner's heart beat. In same frequency range at output of infrasound frequency narrowband amplifier are present components caused by moving of miner's body. However, these components have irregular nature and actually are components of noise, which mean-square value with known time interval is equal to zero. Spectral components caused by human heartbeat have regular nature and easy to recognise by applying correlation processing of signal. Microcontroller performs digitisation of signal present at output of infrasound frequency amplifier and generates correlation processing sequence of digital data at given time interval. As a result of this processing microcontroller provide components having periodic structure, which, in fact, correspond to human cardiac rhythm. Further, via its standard digital interface microcontroller outputs data to recipient of information on miner's heart rhythm.EFFECT: sensor for permanent miner's heart rhythm monitoring can be used for permanent monitoring of heart rhythm of whole personnel in mines, both during execution of scheduled operations, and in case of emergency situations, resulting in mine personnel insulation beyond/under blockage of mine rock.1 cl |
