SU563494A1 - Monitor of coal-rock surface - Google Patents
Monitor of coal-rock surfaceInfo
- Publication number
- SU563494A1 SU563494A1 SU7401991027A SU1991027A SU563494A1 SU 563494 A1 SU563494 A1 SU 563494A1 SU 7401991027 A SU7401991027 A SU 7401991027A SU 1991027 A SU1991027 A SU 1991027A SU 563494 A1 SU563494 A1 SU 563494A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- coal
- sensing element
- transistor
- oscillator
- monitor
- Prior art date
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
15 соединен с базой транзистора 16 эмиттерного повторител 17, который соединен с приемным блоком датчика (не показан на чертеже).15 is connected to the base of the transistor 16 of the emitter follower 17, which is connected to the receiving unit of the sensor (not shown in the drawing).
Датчик работает следующим образом.The sensor works as follows.
Воспринимающий элемент 4 измер ет толщину угольной пачки, пропорционально толщине которой измен етс его емкость. Это приводит к изменению режима работы автогенератора 1. Переменное напр жение высокой частоты, нропорциональное толщине угольной пачки, снимаетс с части витков катушки 13 индуктивности и через цепочку RC 14 и 15 подаетс на эмиттерный по1вторитель 17 (на транзисторе 16), с которого подаетс сигнал на приемный блок датчика.The sensing element 4 measures the thickness of the coal bundle, in proportion to the thickness of which the capacitance varies. This leads to a change in the operating mode of the oscillator 1. A high-frequency alternating voltage proportional to the thickness of the coal bundle is removed from the turns of coil 13 of the inductance and through RC 14 and 15 is fed to the emitter transducer 17 (transistor 16), from which a signal is sent to sensor receiving unit.
Изменение .влажности среды вызывает изменение сопротивлени между пластинами конденсаторного воспринимающего элемента 4. При этом измен етс ток в цепи резисторов 7, 8 и происходит падение напр жени на .них. Поскольку падение нап1р жени на резисторах 7 и 8 прапорционально величинам сопротивлений, а сопротивление резистора 7 мало (сотни ом) по отношению к сопротивлению резистора 8 (тыс чи ом), то на резисторе 7 происходит малое изменение напр жени , которое усиливаетс усилителем 10 посто нного тока. Варикапы 5, 6, управл емые усиленным напр жением, уменьшают свою емкость .пропорционально увеличению влажности среды и компенсируют увеличение емкости конденсаторного воспринимающего элемента 4 от влажности.A change in the humidity of the medium causes a change in the resistance between the plates of the capacitor sensing element 4. At the same time, the current in the resistor circuit 7, 8 changes and the voltage drops across them. Since the voltage drop across resistors 7 and 8 is proportional to the resistance values, and the resistance of the resistor 7 is small (hundreds of ohms) relative to the resistance of the resistor 8 (thousand), a small change in voltage occurs on the resistor 7, which is amplified by a constant amplifier 10 current. Varicaps 5, 6, controlled by the increased voltage, reduce their capacity in proportion to the increase in the humidity of the environment and compensate for the increase in the capacity of the capacitor sensing element 4 from humidity.
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Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7401991027A SU563494A1 (en) | 1974-01-25 | 1974-01-25 | Monitor of coal-rock surface |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7401991027A SU563494A1 (en) | 1974-01-25 | 1974-01-25 | Monitor of coal-rock surface |
Publications (1)
Publication Number | Publication Date |
---|---|
SU563494A1 true SU563494A1 (en) | 1977-06-30 |
Family
ID=20574125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU7401991027A SU563494A1 (en) | 1974-01-25 | 1974-01-25 | Monitor of coal-rock surface |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU563494A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003073132A1 (en) * | 2002-02-21 | 2003-09-04 | Robert Bosch Gmbh | Method and measuring device for locating enclosed objects |
-
1974
- 1974-01-25 SU SU7401991027A patent/SU563494A1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003073132A1 (en) * | 2002-02-21 | 2003-09-04 | Robert Bosch Gmbh | Method and measuring device for locating enclosed objects |
US7053599B2 (en) | 2002-02-21 | 2006-05-30 | Robert Bosch Gmbh | Method and measuring device for locating enclosed objects |
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