CN101295183A - Temperature constancy control system for permanent magnetic resonance magnet - Google Patents
Temperature constancy control system for permanent magnetic resonance magnet Download PDFInfo
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- CN101295183A CN101295183A CNA2007100740985A CN200710074098A CN101295183A CN 101295183 A CN101295183 A CN 101295183A CN A2007100740985 A CNA2007100740985 A CN A2007100740985A CN 200710074098 A CN200710074098 A CN 200710074098A CN 101295183 A CN101295183 A CN 101295183A
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- heater wire
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Abstract
The invention discloses a temperature constant control system used for permanent magnetic resonance magnet temperature constant control. The system consists of a temperature probe, a temperature control meter, an electronic control switch, a heating wire and a heating object; the heating wire contacts with the heating object and is connected with a power supply by the electronic control switch; the control terminal of the electronic control switch is connected with the signal output terminal of the temperature control meter; the temperature probe contacts with the heating object and detects the temperature; the signal output terminal of the temperature probe is connected with the signal input terminal of the temperature control meter. The temperature constant control system can induce the temperature of the heating object by the temperature probe, thus controlling the current inside the heating wire, automatically adjusting the temperature of the heating object, leading a magnetic resonance imaging system to generate clear images so as to ensure the imaging quality, having simple and reliable heating, long service life and short heating time, being not easy to be interfered by electromagnetic radio frequency and being applicable to permanent magnetic resonance imaging equipment.
Description
Technical field
The present invention discloses a kind of temperature constancy control system, particularly a kind of temperature constancy control system that is used for the control of permanent magnetic resonance magnet temperature constant.
Background technology
Nuclear magnetic resonance imaging system is the high-tech medicine equipment, mainly is to utilize the magnetic resonance principle that tissue is carried out fault imaging, has the characteristics of no wound, no RADI, high-resolution.But can produce certain heat during system resonance, the magnetic size of permanent-magnet is easy to be subjected to extraneous thermal effect, prior art magnetic resonance imaging system magnet external temperature control system departure is big, further can influence the picture quality that nuclear magnetic resonance imaging system produces, thus influence its use and clinical medicine on to the judgement of image.At present, do not have the technology of better controlled magnetic resonance imaging system permanent magnet temperature constant in the known field again, thereby limited the development of permanent-magnet type magnetic resonance imaging system to a certain extent and the contribution of physianthropy.
Summary of the invention
Be subject to Temperature Influence at the above-mentioned permanent-magnet type nuclear magnetic resonance imaging system of mentioning of the prior art, it is unsettled definite to produce the system imaging quality, the invention provides a kind of temperature constancy control system for permanent magnetic resonance magnet, it utilizes the temperature of temp probe induction heating body, break-make by temp controlled meter control electronic control switch, further the control heater wire makes the calandria temperature stabilization by electric current.
The technical scheme that the present invention solves its technical matters employing is: a kind of temperature constancy control system for permanent magnetic resonance magnet, system is made up of temp probe, temp controlled meter, electronic control switch, heater wire and heating object, described heater wire contacts with heating object, heater wire is connected with power supply by electronic control switch, the control end of electronic control switch is connected with the signal output part of temp controlled meter, temp probe contacts with heating object, and the signal output of temp probe is connected with the signal input part of temp controlled meter.
The technical scheme that the present invention solves its technical matters employing further comprises:
Be connected with the high to low gear change-over switch of switching firing rate between described temp controlled meter and the electronic control switch, the input end of high to low gear change-over switch is connected with the signal output part of temp controlled meter, and the high to low gear change-over switch is connected with the control end of electronic control switch.
Be connected with anti-electromagnetic radio frequency interference signals wave filter between described temp probe and the temp controlled meter, the input end of traffic filter is connected with the output of the signal of temp probe, and the output terminal of traffic filter is connected with the input end of temp controlled meter.
Described heater wire is the DC current heater wire, is provided with AC-DC converter between heater wire and the power supply, and the AC-DC converter output terminal is connected with heater wire, and the AC-DC converter input end is connected with power supply by electronic control switch.
Be connected with power filter between described heater wire and the AC-DC converter, the power filter input end is connected with AC-DC converter output, the power filter output terminal is connected with heater wire, and the electronic control switch of AC-DC converter prime is connected with the control of temp controlled meter output.
Described electronic control switch adopts solid-state relay.
Described traffic filter adopts multicore (pin) connected mode.
The invention has the beneficial effects as follows: the present invention can pass through temp probe induction heating body temperature degree, and then electric current in the control heater wire, automatically regulate the calandria temperature, the clear picture that magnetic resonance imaging system is produced, guarantee image quality, heat simple and reliable, long service life, heat time heating time is short, and is not easy to be subjected to the electromagnetic radio frequency interference.
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is the contrast synoptic diagram of single core connected mode and multicore connected mode;
Fig. 3 is the circuit theory diagrams of one embodiment of the invention.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principle is identical with basic structure and the present invention or approximate, all within protection domain of the present invention.
Referring to accompanying drawing 1, adopt the mode of DC current heating that calandria is heated in the present embodiment, wherein calandria selects for use iron material to make, the heating object quality can reach more than 20 ton greatly, and its temperature-responsive speed is slow, and overshoot is big, add thermally-stabilisedly, and anti-electromagnetic interference capability is strong.Heater wire contacts with the calandria relative fixed, and heater wire heats calandria, thereby stablizes the permanent-magnet temperature in the magnetic resonance imaging system indirectly.Temp probe contacts with the calandria relative fixed, and the output terminal of temp probe is connected with the input end of temp controlled meter.Electromagnetic radio frequency when being subjected to magnetic resonance imaging easily owing to the temperature detection signal that transmits from temp probe is disturbed, in order to eliminate interference, between temp probe and temp controlled meter, be connected with traffic filter, the traffic filter input end is connected with the output terminal of temp probe, and the traffic filter output terminal is connected with the input end of temp controlled meter.Owing to adopted traffic filter, increased connector again, the signal wire contact resistance is increased and the resistance value instability, thereby make temperature survey inaccurate, in order to overcome above problem, except that designing preferably traffic filter, also use multi-pin connector and connect the method that replaces single core to connect, promptly used the multicore connected mode, improved reliability, as shown in Figure 2.Temp probe induction heating body temperature degree, input to temp controlled meter, temp controlled meter has adopted intelligent temperature control table, according to predefined in the temperature control table from setting parameter, the output control pulse electric current is to the control end of electronic control switch, the break-make of control electronic control switch, further effectively adjust and the control temperature, when the calandria temperature is lower than design temperature when far away, then heating at full capacity, the near more heating dutycycle of distance setting temperature is more little, the heating frequency more little, up to be stabilized in ± 0.1 ℃.Temp probe can adopt thermal resistance or thermopair, and cooperates the relevant detection control circuit, and the temperature signal that thermal resistance or thermopair are detected converts electric signal to, inputs in the temp controlled meter.In the present embodiment, electronic control switch adopts solid-state relay, and it can carry out up to ten million times switching manipulation, long service life.
Referring to accompanying drawing 3, be circuit theory diagrams of the present invention, SSR1 and SSR2 are solid-state relay among the figure, by the control of temp controlled meter to solid-state relay SSR1 and solid-state relay SSR2, further control the break-make of power supply and heater wire, the control that realizes heating Yu do not heat.
Adopt the mode of DC current heating that calandria is heated in the present embodiment, heater wire is connected with the output terminal of AC-DC converter, the input end of AC-DC converter is connected with power supply by solid-state relay, and the control end of solid-state relay is connected with the control output end of temp controlled meter.After temp controlled meter sends control signal and gives solid-state relay, the solid-state relay conducting, AC power converts DC current to by AC-DC converter and powers to heater wire, and calandria is heated.Be connected with power filter between AC-DC converter and the heater wire, the electronic control switch of AC-DC converter prime is connected to the control output end of temp controlled meter, can be input to the heating current size of magnet heater wire by power filter control, further control the rate of heat addition size of heater wire.
Be provided with the high to low gear change-over switch in control circuit, the high to low gear change-over switch is connected between solid-state relay and the power supply, and the control end of high to low gear change-over switch is connected with the control of temp controlled meter output.When first heating, adopt the high gear heating can reach the control temperature fast, save heat time heating time, use the low gear heating instead after stable, further control heating accuracy when heating-up temperature reaches.Be connected with overheating protection circuit between high to low gear change-over switch and the power supply; the control end of overheating protection circuit is connected with the control output end of temp controlled meter; the calandria temperature of sensing when temp probe surpasses set temperature value; after reaching certain value; relay in the overheating protection circuit cuts off automatically, stops the heating to calandria.
The present invention is simple and reliable, can effectively control magnet temperature in the permanent magnetic resonance, uninterruptedly long-play, fault is low, and antijamming capability is strong, is used for the temperature constant of magnetic resonance imaging system, can make it reach good effect, help the development and the application of magnetic resonance imaging.
Claims (8)
1, a kind of temperature constancy control system for permanent magnetic resonance magnet, it is characterized in that: described system is made up of temp probe, temp controlled meter, electronic control switch, heater wire and heating object, described heater wire contacts with heating object, heater wire is connected with power supply by electronic control switch, the control end of electronic control switch is connected with the signal output part of temp controlled meter, temp probe contacts with heating object, and the signal output of temp probe is connected with the signal input part of temp controlled meter.
2, temperature constancy control system for permanent magnetic resonance magnet according to claim 1, it is characterized in that: be connected with the high to low gear change-over switch of switching firing rate between described temp controlled meter and the electronic control switch, the input end of high to low gear change-over switch is connected with the signal output part of temp controlled meter, and the high to low gear change-over switch is connected with the control end of electronic control switch.
3, temperature constancy control system for permanent magnetic resonance magnet according to claim 1 and 2, it is characterized in that: be connected with anti-electromagnetic radio frequency interference signals wave filter between described temp probe and the temp controlled meter, the input end of traffic filter is connected with the output of the signal of temp probe, and the output terminal of traffic filter is connected with the input end of temp controlled meter.
4, temperature constancy control system for permanent magnetic resonance magnet according to claim 1 and 2, it is characterized in that: described heater wire is the DC current heater wire, be provided with AC-DC converter between heater wire and the power supply, the AC-DC converter output terminal is connected with heater wire, and the AC-DC converter input end is connected with power supply by electronic control switch.
5, temperature constancy control system for permanent magnetic resonance magnet according to claim 4, it is characterized in that: be connected with power filter between described heater wire and the AC-DC converter, the power filter input end is connected with AC-DC converter output, the power filter output terminal is connected with heater wire, and the electronic control switch of AC-DC converter prime is connected with the control output end of temp controlled meter.
6, temperature constancy control system for permanent magnetic resonance magnet according to claim 1 and 2 is characterized in that: described electronic control switch adopts solid-state relay.
7, temperature constancy control system for permanent magnetic resonance magnet according to claim 3 is characterized in that: described traffic filter adopts the multicore connected mode.
8, temperature constancy control system for permanent magnetic resonance magnet according to claim 1 and 2 is characterized in that: described temp probe can adopt thermal resistance or thermopair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100740985A CN101295183A (en) | 2007-04-24 | 2007-04-24 | Temperature constancy control system for permanent magnetic resonance magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100740985A CN101295183A (en) | 2007-04-24 | 2007-04-24 | Temperature constancy control system for permanent magnetic resonance magnet |
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| CN101295183A true CN101295183A (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100740985A Pending CN101295183A (en) | 2007-04-24 | 2007-04-24 | Temperature constancy control system for permanent magnetic resonance magnet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968534A (en) * | 2010-09-16 | 2011-02-09 | 厦门大学 | Nuclear magnetic resonance spectrometer gas circuit and temperature control system based on LAN (Local Area Network) and CAN (Controller Area Network) bus |
| CN108469543A (en) * | 2018-03-30 | 2018-08-31 | 清华大学 | Induced potential measurement method and system |
| CN109307683A (en) * | 2017-07-28 | 2019-02-05 | 丹东东方测控技术股份有限公司 | A kind of temperature control device for industrial nuclear magnetic resonance permanent magnet systems |
| CN111025209A (en) * | 2019-12-20 | 2020-04-17 | 深圳安科高技术股份有限公司 | Temperature control circuit of nuclear magnetic resonance system and nuclear magnetic resonance system |
| CN111149185A (en) * | 2017-07-28 | 2020-05-12 | 尹楚尔Ip有限责任公司 | Improved switch |
| CN114047466A (en) * | 2021-10-20 | 2022-02-15 | 江苏力磁医疗设备有限公司 | Magnetic resonance imaging device suitable for baby |
-
2007
- 2007-04-24 CN CNA2007100740985A patent/CN101295183A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968534A (en) * | 2010-09-16 | 2011-02-09 | 厦门大学 | Nuclear magnetic resonance spectrometer gas circuit and temperature control system based on LAN (Local Area Network) and CAN (Controller Area Network) bus |
| CN101968534B (en) * | 2010-09-16 | 2012-11-14 | 厦门大学 | Nuclear magnetic resonance spectrometer gas circuit and temperature control system based on LAN (Local Area Network) and CAN (Controller Area Network) bus |
| CN109307683A (en) * | 2017-07-28 | 2019-02-05 | 丹东东方测控技术股份有限公司 | A kind of temperature control device for industrial nuclear magnetic resonance permanent magnet systems |
| CN111149185A (en) * | 2017-07-28 | 2020-05-12 | 尹楚尔Ip有限责任公司 | Improved switch |
| CN111149185B (en) * | 2017-07-28 | 2022-03-25 | 尹楚尔Ip有限责任公司 | Improved switch |
| CN108469543A (en) * | 2018-03-30 | 2018-08-31 | 清华大学 | Induced potential measurement method and system |
| CN108469543B (en) * | 2018-03-30 | 2019-03-05 | 清华大学 | Induced potential measurement method and system |
| CN111025209A (en) * | 2019-12-20 | 2020-04-17 | 深圳安科高技术股份有限公司 | Temperature control circuit of nuclear magnetic resonance system and nuclear magnetic resonance system |
| CN114047466A (en) * | 2021-10-20 | 2022-02-15 | 江苏力磁医疗设备有限公司 | Magnetic resonance imaging device suitable for baby |
| CN114047466B (en) * | 2021-10-20 | 2024-01-26 | 江苏力磁医疗设备有限公司 | Magnetic resonance imaging device suitable for infants |
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Open date: 20081029 |