CN102494734A - Time-sharing power supply control system for liquid helium level gauge - Google Patents
Time-sharing power supply control system for liquid helium level gauge Download PDFInfo
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- CN102494734A CN102494734A CN201110451515XA CN201110451515A CN102494734A CN 102494734 A CN102494734 A CN 102494734A CN 201110451515X A CN201110451515X A CN 201110451515XA CN 201110451515 A CN201110451515 A CN 201110451515A CN 102494734 A CN102494734 A CN 102494734A
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- level gauge
- liquid helium
- control system
- liquid level
- power supply
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Abstract
The invention discloses a time-sharing power supply control system for a liquid helium level gauge. The time-sharing power supply control system comprises the liquid helium level gauge, a constant current source (4) and a computer control system (7). The liquid helium level gauge comprises a heater strip (1), a niobium-titanium superconducting filament (2) and a level gauge fixing rod (3), wherein the heater strip (1) and the niobium-titanium superconducting filament (2) are welded in series, and are fixed on the level gauge fixing rod (3). The constant current source (4) supplies power to the liquid helium level gauge. An on-off control card (5) and a voltage acquisition card (6) are arranged in the computer control system (7), wherein the on-off control card (5) is connected in series with a power supply circuit of the constant current source (4), and is used for controlling the on/off state and on/off time of power supply current. The computer control system (7) controls the on/off state and on/off time of the on-off control card (5), reads voltage values at the two ends of the niobium-titanium superconducting filament (2) of the liquid helium level gauge through the voltage acquisition card (6), and converts the voltage values into a level value.
Description
Technical field
The present invention relates to a kind of liquid helium liquid level gauge time sharing power supply control system, relate in particular to liquid helium Dewar liquid level gauge time sharing power supply control system.
Background technology
The liquid helium liquid level gauge can be realized the continuous coverage of liquid helium liquid level in the liquid helium Dewar.Existing a kind of liquid helium liquid level gauge is made up of niobium titanium superconducting filament, heater strip and liquid level gauge fixed bar; Niobium titanium superconducting filament diameter is 59 microns; Heater strip resistance is 20 ohm; The liquid level gauge fixed bar is used for fixing niobium titanium superconducting filament and heater strip, and the liquid level gauge fixed bar adopts and to suit in low temperature environment, to work and epoxy material that thermal losses is low is made.Niobium titanium superconducting filament vertically places liquid helium Dewar, and top is in the gas helium, and establishing length is L1, and the lower part is in the liquid helium, and establishing length is L2.With niobium titanium superconducting filament and heater strip galvanization I; When size of current is suitable; The heater strip heating makes the niobium titanium superconducting filament in the gas helium become normal state by superconducting state, place the niobium titanium superconducting filament of liquid helium to be in superconducting state like this, and the niobium titanium superconducting filament on the liquid helium liquid level is in normal state.The length that the liquid helium liquid level gauge immerses the liquid helium part is long more, and the resistance of liquid helium liquid level gauge is just more little.
Can obtain following formula:
V＝(V
+-V
-)＝I×ρ×L
1/S (1)
The resistivity of ρ-niobium titanium superconducting filament wherein, V is a niobium titanium superconducting filament voltage, V
+Be the positive terminal voltage of niobium titanium superconducting filament, V
-Be niobium titanium superconducting filament negative terminal voltage.Can obtain by formula (1), detect niobium titanium superconducting filament voltage and can calculate liquid helium liquid level size.
The liquid helium liquid level gauge was in "on" position always when existing liquid helium liquid level gauge read the liquid helium level value; Because energising can be generated heat and caused the liquid helium loss; So not only cause the volatilization of liquid helium to waste financial resources, replenish liquid helium also for the liquid helium Dewar and bring inconvenience greatly, cause the waste of manpower.
Summary of the invention
The objective of the invention is to overcome the deficiency that existing liquid helium liquid level gauge is in "on" position always, propose a kind of liquid helium liquid level gauge time sharing power supply control system.The present invention is through being installed in the state that cut-offs and the switch off time of the switch control card control supply current in the computer control system; Read the magnitude of voltage of liquid helium liquid level gauge at the electric current opening state; In working procedure, the magnitude of voltage of liquid helium liquid level gauge is converted into level value according to formula (1) then, and is presented on the program run interface.Reliability of the present invention is high, the loss that can effectively lower liquid helium.
Liquid helium liquid level gauge time sharing power supply control system of the present invention comprises following a few part: liquid helium liquid level gauge, constant current source and computer control system.
Described liquid helium liquid level gauge comprises niobium titanium superconducting filament, heater strip and liquid level gauge fixed bar, and heater strip and niobium titanium superconducting filament series connection welding also are fixed on the liquid level gauge sounding rod.During work; The liquid helium liquid level gauge is vertically mounted in the liquid helium Dewar; Be filled with liquid helium in the liquid helium Dewar; The voltage lead of liquid helium liquid level gauge and current feed are drawn and are picked out to liquid helium Dewar cover plate outside from liquid level gauge fixed bar upper end, and described current feed accesses to constant current source and switch control card, and voltage lead accesses to the voltage acquisition card.Constant current source is used for supplying power to the liquid helium liquid level gauge.Switch control card and voltage acquisition card are installed in the described computer control system.The road output series connection wherein of switch control card inserts in the constant current source power supply circuit, is used to control the state that cut-offs and the switch off time of supply current, and supply current cut-offs state and switch off time is controlled by computer control system.The magnitude of voltage that the voltage acquisition card is gathered niobium titanium heater strip inputs to computer control system, and by computer control system magnitude of voltage is converted into liquid level gauge.
Liquid helium liquid level evaluation can directly be presented on the display screen of computer control system in apparatus of the present invention; Computer control system is controlled opening of supply current and disconnected through the switch control card; The state that cut-offs of supply current and switch off time also can be presented on the display screen, can observe the liquid helium fluid level condition more intuitively like this.
Description of drawings
Fig. 1 liquid helium liquid level gauge time sharing power supply control system synoptic diagram; Among the figure: 1 heater strip, 2 niobium titanium superconducting filaments, 3 liquid level gauge fixed bars, 4 constant current sources, 5 switch control cards, 6 voltage acquisition cards, 7 computer control systems.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, apparatus of the present invention comprise liquid helium liquid level gauge, constant current source 4 and computer control system 7.The liquid helium liquid level gauge comprises heater strip 1, niobium titanium superconducting filament 2 and liquid level gauge fixed bar 3, and heater strip 1 is connected with niobium titanium superconducting filament 2 and welded and be fixed on the liquid level gauge sounding rod 3.The diameter of niobium titanium superconducting filament 2 is 59 microns, and the resistance of heater strip 1 is 20 ohm.During work; The liquid helium liquid level gauge is vertically mounted in the liquid helium Dewar; Be filled with liquid helium in the liquid helium Dewar; The voltage lead of liquid helium liquid level gauge and current feed are drawn and are picked out to liquid helium Dewar cover plate outside from liquid level gauge fixed bar upper end, and described current feed accesses to constant current source and switch control card, and voltage lead accesses to the voltage acquisition card.Niobium titanium superconducting filament 2 vertically places liquid helium Dewar, and the top of niobium titanium superconducting filament 2 is in the gas helium, and the lower part of niobium titanium superconducting filament 2 is in the liquid helium.The electric current of constant current source 4 is 100mA, is the working current of liquid helium liquid level gauge.If liquid helium liquid level gauge supply current is less than 100mA, then too little can not the making of heater strip 1 heating power is in helium part niobium titanium superconducting filament 2 quench; If liquid helium liquid level gauge supply current greater than 100mA, then can increase the liquid helium thermal losses, so liquid helium liquid level gauge supply current size is 100mA.Switch control card 5 and voltage acquisition card 6 are installed in the described computer control system.5 series connection of switch control card insert in the feed circuit of constant current source 4, are used to control the state that cut-offs and the switch off time of supply current, the state that cut-offs and the switch off time of computer control system 7 CS control cards 5.Among the present invention in the liquid helium liquid level gauge one minute conduction time be 5 seconds, the no power time is 55 seconds.In the conduction time in 5 seconds, computer control system 7 reads the magnitude of voltage at niobium titanium superconducting filament 2 two ends of liquid helium liquid level gauge through voltage acquisition card 6, through formula (1) magnitude of voltage is converted into level value:
V＝(V
+-V
-)＝I×ρ×L
1/S (1)
The resistivity of ρ-niobium titanium superconducting filament wherein, V is a niobium titanium superconducting filament voltage, V
+Be the positive terminal voltage of niobium titanium superconducting filament, V
-Be niobium titanium superconducting filament negative terminal voltage.
Control system of the present invention can effectively lower the liquid helium loss, and reliability is high.
Claims (1)
1. a liquid helium liquid level gauge time sharing power supply control system is characterized in that, described device comprises liquid helium liquid level gauge, constant current source (4) and computer control system (7); Described liquid helium liquid level gauge comprises heater strip (1), niobium titanium superconducting filament (2) and liquid level gauge fixed bar (3), and described heater strip (1) and niobium titanium superconducting filament (2) series connection welding also are fixed on the liquid level gauge sounding rod (3); Described constant current source (4) is given the power supply of liquid helium liquid level gauge; Switch control card (5) and voltage acquisition card (6) are housed in the computer control system (7); Switch control card (5) series connection inserts in the feed circuit of constant current source (4); Be used to control the state that cut-offs and the switch off time of supply current; The state that cut-offs and the switch off time of computer control system (7) CS control card (5), and the magnitude of voltage at niobium titanium superconducting filament (2) two ends through reading the liquid helium liquid level gauge through voltage acquisition card (6) are converted into level value with magnitude of voltage.
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|---|---|---|---|
| CN201110451515XA CN102494734A (en) | 2011-12-29 | 2011-12-29 | Time-sharing power supply control system for liquid helium level gauge |
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|---|---|---|---|
| CN201110451515XA CN102494734A (en) | 2011-12-29 | 2011-12-29 | Time-sharing power supply control system for liquid helium level gauge |
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| CN201110451515XA Pending CN102494734A (en) | 2011-12-29 | 2011-12-29 | Time-sharing power supply control system for liquid helium level gauge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090925A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院电工研究所 | Liquid nitrogen liquid level indicator |
| CN103376143A (en) * | 2012-04-13 | 2013-10-30 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
| CN110879091A (en) * | 2019-11-01 | 2020-03-13 | 东软医疗系统股份有限公司 | Liquid level meter for liquid helium, calibration method thereof and liquid helium container |
| CN113340376A (en) * | 2020-03-02 | 2021-09-03 | 中国科学院理化技术研究所 | Superconducting liquid level meter and superconducting liquid level meter measuring system for measuring liquid helium level |
| CN114184254A (en) * | 2021-10-27 | 2022-03-15 | 中国环境科学研究院 | High-density electrical method-based III-shaped measuring device and measuring method |
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2011
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376143A (en) * | 2012-04-13 | 2013-10-30 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
| CN103376143B (en) * | 2012-04-13 | 2015-05-20 | 上海联影医疗科技有限公司 | Liquid helium level measurement method |
| CN103090925A (en) * | 2013-01-24 | 2013-05-08 | 中国科学院电工研究所 | Liquid nitrogen liquid level indicator |
| CN110879091A (en) * | 2019-11-01 | 2020-03-13 | 东软医疗系统股份有限公司 | Liquid level meter for liquid helium, calibration method thereof and liquid helium container |
| CN113340376A (en) * | 2020-03-02 | 2021-09-03 | 中国科学院理化技术研究所 | Superconducting liquid level meter and superconducting liquid level meter measuring system for measuring liquid helium level |
| CN114184254A (en) * | 2021-10-27 | 2022-03-15 | 中国环境科学研究院 | High-density electrical method-based III-shaped measuring device and measuring method |
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Application publication date: 20120613 |