CN105517314A - Accelerating tube vacuum degree detection device for linear accelerator - Google Patents
Accelerating tube vacuum degree detection device for linear accelerator Download PDFInfo
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- CN105517314A CN105517314A CN201510870071.1A CN201510870071A CN105517314A CN 105517314 A CN105517314 A CN 105517314A CN 201510870071 A CN201510870071 A CN 201510870071A CN 105517314 A CN105517314 A CN 105517314A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/22—Details of linear accelerators, e.g. drift tubes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
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Abstract
The invention provides an accelerating tube vacuum degree detection device for a linear accelerator, and the device comprises a titanium pump, an accelerating tube, a current detection module, and an upper computer. The current detection module is located in a treatment room where the linear accelerator is located, and the upper computer is located outside the treatment room. The titanium pump is used for maintaining the vacuum state of the interior of the accelerating tube. The current detection module is used for obtaining the current of the titanium pump from a working power supply of the titanium pump, wherein the current of the titanium pump represents the vacuum degree of the accelerating tube. The upper computer is used for receiving the current, outputted by the current detection module, of the titanium pump, judging the vacuum degree of the accelerating tube through the current of the titanium pump, and controlling the accelerating tube to stop if the current of the titanium pump is judged to be greater than a current preset value. The titanium pump and the interior of the accelerating tube are communicated with each other, and the current of the titanium pump can represent the vacuum degree of the interior of the accelerating tube. The device monitors the vacuum degree of the accelerating tube through detecting the current of the titanium pump. When the current of the titanium pump is detected to be greater than the current preset value, it indicates that the vacuum degree of the interior of the accelerating tube does not meet the requirements, the vacuum degree of the interior of the accelerating tube is lower, and the accelerating tube needs to be stopped at this moment.
Description
Technical field
The present invention relates to technical field of medical equipment, particularly a kind of accelerating tube vacuum-ness detecting device of linear accelerator.
Background technology
When the accelerating tube of medical electron linear accelerator works, require that inside cavity must remain on the state of high vacuum, namely need to remain on 1.333*10
-5pa atmospheric pressure.Only under high vacuum state, very high electric field could be set up in the cavity of accelerating tube and don't spark phenomenon occurs, preventing the poisoning pollution of gun cathode simultaneously.Because the price comparison of accelerating tube is high, the price of an accelerating tube is more than 200,000 yuan.Therefore, need to detect the vacuum degree in accelerating tube cavity, judge the operating state of accelerating tube, in order to avoid accelerating tube damages because the vacuum degree in cavity is too low.
Therefore, those skilled in the art need the accelerating tube vacuum-ness detecting device providing a kind of linear accelerator, accurately can detect the vacuum degree of accelerating tube.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of accelerating tube vacuum-ness detecting device of linear accelerator, accurately can detect the vacuum degree of accelerating tube.
The embodiment of the present invention provides a kind of accelerating tube vacuum-ness detecting device of linear accelerator, comprising: titanium pump, accelerating tube, current detection module and host computer;
Described current detection module is positioned at the therapeutic room at linear accelerator place, and described host computer is positioned at outside described therapeutic room;
Described titanium pump, for maintaining the vacuum state in described accelerating tube;
Described current detection module, for obtaining titanium pump electric current from the working power of described titanium pump, described titanium pump electric current characterizes the vacuum degree of described accelerating tube;
Described host computer, for receiving the titanium pump electric current that described current detection module exports, being judged the vacuum degree of described accelerating tube, when judging described titanium pump electric current higher than electric current preset value, controlling described accelerating tube and quitting work by described titanium pump electric current.
Preferably, described current detection module comprises: sampling interface circuit;
Described sampling interface circuit comprises the first chip and current sampling resistor;
Described first chip act as operating voltage input voltage being converted to described titanium pump and needing;
The positive output end of described first chip connects described titanium pump, and the negative output terminal of described first chip is by described current sampling resistor ground connection;
Collection flows through the electric current of described current sampling resistor to characterize the vacuum degree of described accelerating tube.
Preferably, described current detection module also comprises: first order amplifying circuit, filter circuit and second level amplifying circuit;
Voltage on described current sampling resistor inputs described first order amplifying circuit;
Described first order amplifying circuit, amplifies for doing the first order to the voltage on described current sampling resistor;
Described filter circuit, for the interference signal in the signal that first order amplifying circuit described in filtering exports;
Described second level amplifying circuit, carries out second level amplification for the signal exported described filter circuit.
Preferably, described current detection module also comprises: current signal transfer circuit;
Described current signal transfer circuit comprises: the first amplifier and the second amplifier;
The output of described second level amplifying circuit connects the normal phase input end of the first amplifier by the 15 resistance; The inverting input of described first amplifier connects the output of described first amplifier by the 4th resistance;
The output of described first amplifier connects the normal phase input end of described second amplifier by the 12 resistance, the inverting input of described second amplifier connects the output of described second amplifier;
The electric current of the normal phase input end of described second amplifier sends to described host computer.
Preferably, also comprise: volometer drive circuit;
Described volometer drive circuit comprises: the 3rd amplifier, the 4th amplifier, the 5th amplifier and the 6th amplifier;
The normal phase input end of described 3rd amplifier of voltage input on described current sampling resistor, the inverting input of described 3rd amplifier connects the output of described 3rd amplifier;
The centre tap output of described first chip connects the normal phase input end of described 4th amplifier, the inverting input of described 4th amplifier connects the output of described 4th amplifier, and the voltage of the centre tap output of described first chip is the one thousandth of the voltage of the positive output end output of described first chip;
The output of described 3rd amplifier connects the normal phase input end of described 5th amplifier by the 22 resistance, the output of described 4th amplifier connects the inverting input of described 5th amplifier by the 29 resistance;
The output of described 5th amplifier connects the normal phase input end of described 6th amplifier, and the inverting input of described 6th amplifier connects the output of described 6th amplifier;
The output of described 6th amplifier connects volometer.
Preferably, also comprise: chain control circuit;
Described chain control circuit comprises: the 7th comparator, the 8th comparator and optocoupler;
The inverting input of described 7th comparator connects the output of described 5th amplifier; The normal phase input end of described 7th comparator connects the voltage difference of described first chip; The voltage difference of described first chip is the difference of the voltage that the negative output terminal of the voltage that exports of the centre tap of described first chip and described first chip exports;
The output of described 7th comparator connects the inverting input of described 8th comparator, and the normal phase input end of described 8th comparator connects reference voltage; The output of described 8th comparator connects the anode of the light-emitting diode of described optocoupler; The minus earth of the light-emitting diode of described optocoupler;
First output of described optocoupler connects power supply, and the second output of described optocoupler connects described host computer;
Described host computer, during for judging that the signal that the second output of described optocoupler exports is useful signal, controlling described accelerating tube and quitting work.
Preferably, also comprise: the 7th amplifier;
Described 7th amplifier, for amplifying the normal phase input end being connected to described 7th comparator later by the voltage difference of described first chip.
Preferably, described filter circuit is low-pass filter circuit, and described low-pass filter circuit comprises: the 8th resistance, the 9th resistance and the 6th electric capacity;
The first end of described 8th resistance connects the output of described first order amplifying circuit, and the second end of described 8th resistance connects the first end of described 9th resistance;
Second end of described 9th resistance connects the input of described second level amplifying circuit;
Second end of described 8th resistance is by described 6th capacity earth.
Preferably, described first order amplifying circuit comprises: the first amplification chip, the second resistance and the 3rd resistance;
The normal phase input end of described first amplification chip of voltage input on described current sampling resistor, the inverting input of described first amplification chip is by the second grounding through resistance; The output of described first amplification chip connects the inverting input of described first amplification chip by the 3rd resistance.
Preferably, described filter circuit is low-pass filter circuit;
Described low-pass filter circuit comprises: the 8th resistance, the 9th resistance and the 6th electric capacity;
The first end of described 8th resistance connects the output of described first order amplifying circuit, and the second end of described 8th resistance connects the first end of described 9th resistance;
Second end of described 9th resistance connects the input of described second level amplifying circuit;
Second end of described 8th resistance is by described 6th capacity earth.
Compared with prior art, the present invention has the following advantages:
The checkout gear that the embodiment of the present invention provides, titanium pump is communicated with accelerating tube inside, titanium pump can make accelerating tube inside keep vacuum state, because titanium pump electric current can characterize the situation of the vacuum degree in accelerating tube, this device obtains titanium pump electric current from the working power of titanium pump, and titanium pump electric current is less, and the vacuum degree in accelerating tube is higher, titanium pump electric current is larger, and the vacuum degree in accelerating tube is lower.Therefore, the present invention monitors the vacuum degree of accelerating tube by detecting titanium pump electric current, when detecting titanium pump electric current higher than electric current preset value, show that the vacuum degree in accelerating tube cavity is undesirable, vacuum degree is lower, now needs to control accelerating tube and quits work.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is accelerating tube vacuum-ness detecting device embodiment one schematic diagram of linear accelerator provided by the invention;
Fig. 2 is sampling interface circuit schematic diagram provided by the invention;
Fig. 3 is the amplification driving circuit schematic diagram in current detection module provided by the invention;
Fig. 4 is current signal transfer circuit diagram provided by the invention;
Fig. 5 is volometer drive circuit schematic diagram provided by the invention;
Fig. 6 is chain control circuit schematic diagram provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
See Fig. 1, this figure is accelerating tube vacuum-ness detecting device embodiment one schematic diagram of linear accelerator provided by the invention.
An accelerating tube vacuum-ness detecting device for linear accelerator, is characterized in that, comprising: accelerating tube 100, titanium pump 200, current detection module 300 and host computer 400;
In addition, medical electron linear accelerator normally works, and need microwave power source 500 to provide power for magnetron 600, magnetron 600 forms magnetic field.
Described current detection module 300 is positioned at the therapeutic room at linear accelerator place, and described host computer 400 is positioned at outside described therapeutic room;
Be understandable that, what linear accelerator exported is the X ray that radiation is larger, be positioned at therapeutic room, and medical worker is generally positioned at outside therapeutic room.
Be understandable that, accelerating tube 100 and titanium pump 200 all belong to linear accelerator and produce the parts accelerating electronics.
Described titanium pump 200, for maintaining the vacuum state in described accelerating tube 100;
Titanium pump is also called sputter ion pump, and accelerating tube is as a whole, is a kind of device for maintaining the high vacuum in accelerating tube.Electric control system needs for titanium pump provides a DC high-voltage power supply.Due to the difference of accelerating tube self, the titanium pump that different accelerating tubes needs is not quite alike, and the DC power supply that the accelerator such as had needs titanium pump to provide is 3500V-4000V.In order to prevent accelerating tube cavity and gun cathode poisoning, avoid discharge breakdown in accelerating tube, the residual gas reduced in electronics and accelerating tube collides and causes the loss of energy, will maintain high vacuum state in accelerating tube.
Under accelerating tube is in static state (i.e. accelerating tube electron gun filament preheating) state, titanium pump electric current is less than 10uA, and under state that accelerating tube is in dynamically (accelerating tube go out bundle during), titanium pump electric current is no more than 20uA.
Described current detection module 300, for obtaining titanium pump electric current from the working power of described titanium pump 200, described titanium pump electric current characterizes the vacuum degree of described accelerating tube 100;
Because titanium pump electric current can characterize the vacuum degree situation of accelerating tube 100, therefore, the method that the present invention takes measures titanium pump electric current.
Described host computer 400, for receiving the titanium pump electric current that described current detection module 300 exports, being judged the vacuum degree of described accelerating tube, when judging described titanium pump electric current higher than electric current preset value, controlling described accelerating tube and quitting work by described titanium pump electric current.
The checkout gear that the embodiment of the present invention provides, titanium pump is communicated with accelerating tube inside, titanium pump can make accelerating tube inside keep vacuum state, because titanium pump electric current can characterize the situation of the vacuum degree in accelerating tube, this device obtains titanium pump electric current from the working power of titanium pump, and titanium pump electric current is less, and the vacuum degree in accelerating tube is higher, titanium pump electric current is larger, and the vacuum degree in accelerating tube is lower.Therefore, the present invention monitors the vacuum degree of accelerating tube by detecting titanium pump electric current, when detecting titanium pump electric current higher than electric current preset value, show that the vacuum degree in accelerating tube cavity is undesirable, vacuum degree is lower, now needs to control accelerating tube and quits work.
Because the operating voltage of titanium pump is higher, such as, in real work, titanium pump may need the high direct voltage of 3800V, and under so high voltage, general sampling rate is more difficult.The present invention, in order to ensure that the accuracy of sampled signal devises special sampling interface circuit, is described in detail below in conjunction with accompanying drawing.
See Fig. 2, this figure is sampling interface circuit schematic diagram provided by the invention.
In the present embodiment, current detection module comprises: sampling interface circuit;
As shown in Figure 2, sampling interface circuit comprises the first chip U1 and current sampling resistor R11;
It should be noted that, described first chip U1 act as operating voltage input voltage being converted to described titanium pump needs; Namely U1 is a boost chip, and Main Function is that high voltage exports by the low voltage transition of input.
Be introduced for 24V for the input voltage of U1 in the present embodiment, be understandable that, this input voltage can get different numerical value according to concrete circuit design.24V is a supply voltage on circuit control panel provided by the invention.
The positive output end OUT+ of described first chip U1 connects described titanium pump, and the negative output terminal of described first chip U1 is by described current sampling resistor R11 ground connection;
Collection flows through the electric current of described current sampling resistor R11 to characterize the vacuum degree of described accelerating tube.
U1 has two inputs, three outputs.The i.e. IN+ connection+24V of U1, the IN-ground connection of U1; The OUT+ of U1 is the positive output end of power supply, such as, be 3800V.The OUT-of U1 is the negative output terminal of power supply, and the MTR+ of U1 is centre tap output, and the voltage that in the present embodiment, MTR+ exports is the one thousandth of U1 output voltage.
The anode of titanium pump is connected with the OUT+ of U1 by high-pressure coaxial cable, and then voltage is too high for the anode of direct-detection titanium pump, for high-voltage electrical apparatus isolation too difficulty accomplish; And titanium pump negative terminal is connected with protecting field, and reliably access the earth, therefore can not carry out the current detecting of accelerating tube at the negative terminal of titanium pump.
Therefore, adopt in the present embodiment U1 negative output terminal OUT-be connected current sampling resistor R11 between ground, it is final that gather is magnitude of voltage HV_OUT on R11, resistance due to R11 is known, therefore, can obtain by the numerical value of HV_OUT the current value flow through on R11, i.e. titanium pump electric current.
Titanium pump electric current is very little, and in namely corresponding acceleration tube chamber, electric current is also very little, and when in acceleration tube chamber, electric current exceedes electric current preset value, represent that the intraluminal vacuum degree of acceleration is lower, such as electric current preset value is 5uA.Therefore, the titanium pump electric current of detection is also very little, in order to the current signal that identification number magnitude is less, needs to amplify and filtering process the electric current of sampling, is described in detail below in conjunction with accompanying drawing.
See Fig. 3, this figure is the amplification driving circuit schematic diagram in current detection module provided by the invention.
Described current detection module also comprises: first order amplifying circuit, filter circuit and second level amplifying circuit;
Voltage on described current sampling resistor inputs described first order amplifying circuit;
Described first order amplifying circuit, amplifies for doing the first order to the voltage on described current sampling resistor;
Described filter circuit, for the interference signal in the signal that first order amplifying circuit described in filtering exports;
Described second level amplifying circuit, carries out second level amplification for the signal exported described filter circuit;
As shown in Figure 3, first order amplifying circuit comprises the first amplification chip U2 and the second resistance R2, the 3rd resistance R3;
Voltage HV_OUT-on current sampling resistor R11 inputs described first order amplifying circuit, and namely HV_OUT-connects the normal phase input end of U2, and the inverting input of U2 is by the second resistance R2 ground connection; The output of U2 connects the inverting input of U2 by the 3rd resistance R3;
It should be noted that, be the nA order of magnitude because titanium pump electric current is minimum, and therefore U2 needs the operational amplifier chip that selection bias current is less, and require that the bias current of U2 is no more than 100pA, the offset voltage of U2 is no more than 5uA.
Described filter circuit is low-pass filter circuit, and described low-pass filter circuit comprises: the 8th resistance R8, the 9th resistance R9 and the 6th electric capacity C6;
The first end of described 8th resistance R8 connects the output of described first order amplifying circuit, and second end of described 8th resistance R8 connects the first end of described 9th resistance R9;
Second end of described 9th resistance R9 connects the input of described second level amplifying circuit;
Second end of described 8th resistance R8 is by described 6th electric capacity C6 ground connection.
The effect of low-pass filter circuit is filtering interference signals.
Second level amplifying circuit comprises: the 6th resistance R6, the 8th amplifier N4;
The output of described filter circuit connects the inverting input of described 8th amplifier N4, and the inverting input of described 8th amplifier N4 connects the output of the 8th amplifier N4 by described 6th resistance R6;
It should be noted that, HV_OUT-amplifies 10 times altogether by first order amplifying circuit and second level amplifying circuit, and such as: the resistance of R11 is 500k ohm, when the electric current that R11 flows through is 10nA, the pressure drop on R11 is 5mV, and amplifying 10 times is 50mV afterwards.When the electric current that R11 flows through is 1uA, the pressure drop on R11 is 500mV, and amplifying 10 times is 5V afterwards.
Therefore, the scope of the voltage signal of the second level amplifying circuit output of Fig. 3 is 50mV-5V, and corresponding titanium pump current range is 10nA-1uA.
Wherein, first order amplifying circuit can amplify 5 times, and such as titanium pump electric current is the pressure drop on 5nA, R11 is 2.5mV.It is 12.5mV afterwards that first order amplifying circuit amplifies 5 times.Therefore, the 8th amplifier in the amplifying circuit of the second level needs the amplifier selecting offset voltage less, and the offset voltage of general amplifier, at about 10mV, therefore can not select such amplifier.The offset voltage of the N4 in the present embodiment is lower than 75uV.The voltage signal of output so just can be made undistortedly to carry out amplifying, make signal amplitude reach the requirement of Signal transmissions.
The amplification driving circuit that the present embodiment provides, the weak current of the nA level that sampling interface circuit can be detected amplifies.
It should be noted that, the signal demand that the circuit shown in Fig. 3 exports sends to the host computer outside therapeutic room.Due to larger in the radiation of linear accelerator therapeutic room, therefore host computer general distance therapeutic room is distant, general distance about 30 meters.Therefore, need the titanium pump electric current host computer be sent to outside therapeutic room of the small-signal of collection to be needed use small-signal transmission circuit.Introduce accompanying drawing below and introduce current signal transfer circuit provided by the invention in detail.
See Fig. 4, this figure is current signal transfer circuit diagram provided by the invention.
Current detection module provided by the invention also comprises: current signal transfer circuit;
Described current signal transfer circuit comprises: the first amplifier N3A and the second amplifier N3B;
The output VACMETER of described second level amplifying circuit connects the normal phase input end of the first amplifier N3A by the 15 resistance R15; The inverting input of described first amplifier N3A connects the output of described first amplifier N3A by the 4th resistance R4;
The output of described first amplifier N3A connects the normal phase input end of described second amplifier N3B by the 12 resistance R12, the inverting input of described second amplifier N3B connects the output of described second amplifier N3B;
The electric current CURRENT of the normal phase input end of described second amplifier N3B sends to described host computer.
It should be noted that, what N3A and N3B formed is current loop circuit.Because voltage signal pressure drop attenuation ratio in cable transmission process is comparatively large, and current signal is applicable to long range propagation, and loss is smaller, the current loop circuit therefore adopting Fig. 4 to provide in the present embodiment in the form of electric current signal transmission to host computer.
Wherein, the voltage that loses of N3A and N3B needs lower than 3mV.Thus ensure that current signal sends host computer to undistortedly.
When host computer judges that the titanium pump electric current CURRENT that receives is higher than electric current preset value, control accelerating tube and quit work.
It should be noted that, except passing through upper computer detection titanium pump electric current, the present invention can also be detected intuitively by volometer, introduces volometer drive circuit in detail below in conjunction with accompanying drawing.
See Fig. 5, this figure is volometer drive circuit schematic diagram provided by the invention.
Described volometer drive circuit comprises: the 3rd amplifier U4, the 4th amplifier N2C, the 5th amplifier N1B and the 6th amplifier N1A;
Voltage HV_OUT-on described current sampling resistor inputs the normal phase input end of described 3rd amplifier U4, and the inverting input of described 3rd amplifier U4 connects the output of described 3rd amplifier U4;
The centre tap output MTR+ of described first chip connects the normal phase input end of described 4th amplifier N2C, the inverting input of described 4th amplifier N2C connects the output of described 4th amplifier N2C, and the voltage of the centre tap output of described first chip is the one thousandth of the voltage of the positive output end output of described first chip;
The output of described 3rd amplifier U4 connects the normal phase input end of described 5th amplifier N1B by the 22 resistance, the output of described 4th amplifier N2C connects the inverting input of described 5th amplifier N1B by the 29 resistance;
The output of described 5th amplifier N1B connects the normal phase input end of described 6th amplifier N1A, and the inverting input of described 6th amplifier N1A connects the output of described 6th amplifier N1A;
The output of described 6th amplifier N1A connects volometer.
It should be noted that, the voltage that the MTR+ due to the first chip U1 exports is the one thousandth of OUT+ voltage, and therefore, if OUT+ is 3800V, then the voltage that MTR+ exports is 3.8V.
As can be seen from Figure 5, the output of U4 with N2C is all connected with the inverting input of self, namely forms the structure of emitter follower, thus improves the input impedance of differential signal input.Wherein differential signal refers to MTR+ and HV_OUT-.
Be understandable that, avoid the method for common mode interference signal to be adopt differential transfer, in the present embodiment, MTR+ and HV_OUT-two signals are isolated through emitter follower, prevent signal disturbing.Improving differential signal input impedance is in order to avoid there being larger electric current to pass through, thus improves the input voltage of amplifier.
It should be noted that, the output signal VOL in Fig. 5 can connect volometer, not only can read current value but also can read-out voltage value, and medical worker can observe the numerical value of voltage and current intuitively from volometer.Because the abnormal meeting of voltage causes the vacuum degree of accelerating tube bad, the abnormal vacuum degree of accelerating tube that also can cause of electric current is bad.Therefore, can be observed by volometer and cause because voltage is abnormal, or the accelerating tube vacuum degree caused because electric current is abnormal is bad.
The checkout gear that the embodiment of the present invention provides, except monitoring titanium pump electric current, also monitor titanium pump voltage, both have one to go wrong, and all control accelerating tube and quit work.Chain control circuit is introduced in detail below in conjunction with accompanying drawing.
See Fig. 6, this figure is chain control circuit schematic diagram provided by the invention.
It should be noted that, the embodiment that Fig. 6 provides, host computer can occur abnormal at the voltage of titanium pump, and/or when electric current goes wrong, all controls accelerating tube and quit work.And the embodiment host computer that Fig. 4 provides is only receive current signal, when titanium pump electric current goes wrong, control accelerating tube and quit work.
The device that the present embodiment provides also comprises chain control circuit.
As shown in Figure 6, chain control circuit comprises: the 7th comparator N2D, the 8th comparator N2A and optocoupler D1;
The inverting input of described 7th comparator N2D connects the output (N1B namely in Fig. 5) of described 5th amplifier; The normal phase input end of described 7th comparator N2D connects median voltage difference value, and described median voltage difference value is the difference of the voltage HV_OUT-that the negative output terminal of the voltage that exports of the centre tap MTR+ of described first chip U1 and described first chip U1 exports;
The output of described 7th comparator N2D connects the inverting input of described 8th comparator N2A, and the normal phase input end of described 8th comparator N2A connects reference voltage; The output of described 8th comparator N2A connects the anode of the light-emitting diode of described optocoupler D1; The minus earth of the light-emitting diode of described optocoupler D1;
Because the voltage of MTR+ exists fluctuation, fluctuation range is: 3.8V-4.25V.Therefore, being provided with two reference voltages in the present invention, is ALARM1 and ALARM2 respectively.
Be described for the value of ALARM2 below:
When MTR+ is 3.8V, under 5uA state, its magnitude of voltage is: 2.5V+3.8V=6.3V;
When MTR+ is 4.25V, under 5uA state, its magnitude of voltage is: 2.5V+4.25V=6.75V;
Therefore the value of ALARM2 should between 6.3V ~ 6.75V, and therefore value is 6.54V.
It should be noted that, the reference voltage ALARMH that N2A normal phase input end connects can select ALARM1, also can select ALARM2.
First output of described optocoupler D1 connects power supply, and second output of described optocoupler D1 connects described host computer;
Described host computer, during for judging that the signal that second output of described optocoupler D1 exports is useful signal, controlling described accelerating tube and quitting work.
If the input signal of N2A 3 pin be greater than input signal 2 pin-, then N2A output signal is for voltage positive signal, and namely do not exceed 5uA threshold values category, optocoupler D1 input 1 pin and 2 pin conductings, output 5 pin of optocoupler D1 and 4 pin conductings, then host computer obtains 24V signal.
If the input signal of N2A 3 pin be less than input signal 2 pin-, then N2A output signal is negative voltage signal, namely exceed in 5uA threshold values category, end optocoupler D1 input 1 pin below and 2 pin, output 5 pin of optocoupler D1 and 4 pin disconnect, then host computer obtains ILVAC1 signal, carries out chain warning, namely judge that the vacuum degree of accelerating tube has problem, need to control accelerating tube and quit work.
The checkout gear that the above embodiment of the present invention provides, can effectively detect when the voltage of titanium pump or electric current go wrong, the problem that accelerating tube vacuum degree is bad, thus controls accelerating tube and quit work, and avoids accelerating tube impaired.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. an accelerating tube vacuum-ness detecting device for linear accelerator, is characterized in that, comprising: titanium pump, accelerating tube, current detection module and host computer;
Described current detection module is positioned at the therapeutic room at linear accelerator place, and described host computer is positioned at outside described therapeutic room;
Described titanium pump, for maintaining the vacuum state in described accelerating tube;
Described current detection module, for obtaining titanium pump electric current from the working power of described titanium pump, described titanium pump electric current characterizes the vacuum degree of described accelerating tube;
Described host computer, for receiving the titanium pump electric current that described current detection module exports, being judged the vacuum degree of described accelerating tube, when judging described titanium pump electric current higher than electric current preset value, controlling described accelerating tube and quitting work by described titanium pump electric current.
2. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 1, is characterized in that, described current detection module comprises: sampling interface circuit;
Described sampling interface circuit comprises the first chip and current sampling resistor;
Described first chip act as operating voltage input voltage being converted to described titanium pump and needing;
The positive output end of described first chip connects described titanium pump, and the negative output terminal of described first chip is by described current sampling resistor ground connection;
Collection flows through the electric current of described current sampling resistor to characterize the vacuum degree of described accelerating tube.
3. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 2, is characterized in that, described current detection module also comprises: first order amplifying circuit, filter circuit and second level amplifying circuit;
Voltage on described current sampling resistor inputs described first order amplifying circuit;
Described first order amplifying circuit, amplifies for doing the first order to the voltage on described current sampling resistor;
Described filter circuit, for the interference signal in the signal that first order amplifying circuit described in filtering exports;
Described second level amplifying circuit, carries out second level amplification for the signal exported described filter circuit.
4. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 3, is characterized in that, described current detection module also comprises: current signal transfer circuit;
Described current signal transfer circuit comprises: the first amplifier and the second amplifier;
The output of described second level amplifying circuit connects the normal phase input end of the first amplifier by the 15 resistance; The inverting input of described first amplifier connects the output of described first amplifier by the 4th resistance;
The output of described first amplifier connects the normal phase input end of described second amplifier by the 12 resistance, the inverting input of described second amplifier connects the output of described second amplifier;
The electric current of the normal phase input end of described second amplifier sends to described host computer.
5. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 2, is characterized in that, also comprise: volometer drive circuit;
Described volometer drive circuit comprises: the 3rd amplifier, the 4th amplifier, the 5th amplifier and the 6th amplifier;
The normal phase input end of described 3rd amplifier of voltage input on described current sampling resistor, the inverting input of described 3rd amplifier connects the output of described 3rd amplifier;
The centre tap output of described first chip connects the normal phase input end of described 4th amplifier, the inverting input of described 4th amplifier connects the output of described 4th amplifier, and the voltage of the centre tap output of described first chip is the one thousandth of the voltage of the positive output end output of described first chip;
The output of described 3rd amplifier connects the normal phase input end of described 5th amplifier by the 22 resistance, the output of described 4th amplifier connects the inverting input of described 5th amplifier by the 29 resistance;
The output of described 5th amplifier connects the normal phase input end of described 6th amplifier, and the inverting input of described 6th amplifier connects the output of described 6th amplifier;
The output of described 6th amplifier connects volometer.
6. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 5, is characterized in that, also comprise: chain control circuit;
Described chain control circuit comprises: the 7th comparator, the 8th comparator and optocoupler;
The inverting input of described 7th comparator connects the output of described 5th amplifier; The normal phase input end of described 7th comparator connects the voltage difference of described first chip; The voltage difference of described first chip is the difference of the voltage that the negative output terminal of the voltage that exports of the centre tap of described first chip and described first chip exports;
The output of described 7th comparator connects the inverting input of described 8th comparator, and the normal phase input end of described 8th comparator connects reference voltage; The output of described 8th comparator connects the anode of the light-emitting diode of described optocoupler; The minus earth of the light-emitting diode of described optocoupler;
First output of described optocoupler connects power supply, and the second output of described optocoupler connects described host computer;
Described host computer, during for judging that the signal that the second output of described optocoupler exports is useful signal, controlling described accelerating tube and quitting work.
7. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 6, is characterized in that, also comprise: the 7th amplifier;
Described 7th amplifier, for amplifying the normal phase input end being connected to described 7th comparator later by the voltage difference of described first chip.
8. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 3, is characterized in that, described filter circuit is low-pass filter circuit, and described low-pass filter circuit comprises: the 8th resistance, the 9th resistance and the 6th electric capacity;
The first end of described 8th resistance connects the output of described first order amplifying circuit, and the second end of described 8th resistance connects the first end of described 9th resistance;
Second end of described 9th resistance connects the input of described second level amplifying circuit;
Second end of described 8th resistance is by described 6th capacity earth.
9. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 3, is characterized in that, described first order amplifying circuit comprises: the first amplification chip, the second resistance and the 3rd resistance;
The normal phase input end of described first amplification chip of voltage input on described current sampling resistor, the inverting input of described first amplification chip is by the second grounding through resistance; The output of described first amplification chip connects the inverting input of described first amplification chip by the 3rd resistance.
10. the accelerating tube vacuum-ness detecting device of linear accelerator according to claim 3, is characterized in that, described filter circuit is low-pass filter circuit;
Described low-pass filter circuit comprises: the 8th resistance, the 9th resistance and the 6th electric capacity;
The first end of described 8th resistance connects the output of described first order amplifying circuit, and the second end of described 8th resistance connects the first end of described 9th resistance;
Second end of described 9th resistance connects the input of described second level amplifying circuit;
Second end of described 8th resistance is by described 6th capacity earth.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323541A (en) * | 2016-08-17 | 2017-01-11 | 成都凯赛尔电子有限公司 | Method for detecting vacuum degree of X-ray tube |
| CN107702847A (en) * | 2017-07-21 | 2018-02-16 | 浙江绍兴苏泊尔生活电器有限公司 | Vacuum detection method and system and cooking appliance |
| CN109387324A (en) * | 2017-08-08 | 2019-02-26 | 上海卓亚医疗科技有限公司 | A kind of accelerator vacuum level real-time monitoring system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4429998A (en) * | 1981-09-17 | 1984-02-07 | Carson/Burger/Weekly, Inc. | Apparatus for the detection of faults in cups, glasses or the like |
| US20050280374A1 (en) * | 2004-05-31 | 2005-12-22 | Cho Guang S | Apparatus and method for driving lamp of liquid crystal display device |
| EP1895655A1 (en) * | 2006-08-02 | 2008-03-05 | Averd Labs Co., Ltd | Output circuit of vacuum-tube amplifier |
| CN101178371A (en) * | 2006-11-08 | 2008-05-14 | 中国科学院沈阳科学仪器研制中心有限公司 | Electronic gun power supply for reflected high energy electron diffraction instrument |
| JP2008251716A (en) * | 2007-03-29 | 2008-10-16 | Matsushita Electric Ind Co Ltd | Semiconductor device and inspecting method therefor |
| CN201569538U (en) * | 2009-03-19 | 2010-09-01 | 河南省泓钻科技发展有限公司 | Vacuum degree on-line monitoring device of inverted-magnetron febetron discharge vacuum switch |
| CN101902126A (en) * | 2009-05-25 | 2010-12-01 | 同方威视技术股份有限公司 | Power supply device for sputter ion pumps |
| CN102436995A (en) * | 2011-10-25 | 2012-05-02 | 中国电子科技集团公司第四十一研究所 | Hall high voltage detection control method applied to traveling wave tube program control high voltage power supply |
| CN103533689A (en) * | 2012-07-06 | 2014-01-22 | 核工业西南物理研究院 | Titanium-pump power-supply system for large-power microwave vacuum tube |
| CN103743945A (en) * | 2014-01-17 | 2014-04-23 | 大连泰思曼科技有限公司 | Circuit and method for detecting load current of high-voltage pulse power supply |
-
2015
- 2015-12-01 CN CN201510870071.1A patent/CN105517314B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4429998A (en) * | 1981-09-17 | 1984-02-07 | Carson/Burger/Weekly, Inc. | Apparatus for the detection of faults in cups, glasses or the like |
| US20050280374A1 (en) * | 2004-05-31 | 2005-12-22 | Cho Guang S | Apparatus and method for driving lamp of liquid crystal display device |
| EP1895655A1 (en) * | 2006-08-02 | 2008-03-05 | Averd Labs Co., Ltd | Output circuit of vacuum-tube amplifier |
| CN101178371A (en) * | 2006-11-08 | 2008-05-14 | 中国科学院沈阳科学仪器研制中心有限公司 | Electronic gun power supply for reflected high energy electron diffraction instrument |
| JP2008251716A (en) * | 2007-03-29 | 2008-10-16 | Matsushita Electric Ind Co Ltd | Semiconductor device and inspecting method therefor |
| CN201569538U (en) * | 2009-03-19 | 2010-09-01 | 河南省泓钻科技发展有限公司 | Vacuum degree on-line monitoring device of inverted-magnetron febetron discharge vacuum switch |
| CN101902126A (en) * | 2009-05-25 | 2010-12-01 | 同方威视技术股份有限公司 | Power supply device for sputter ion pumps |
| CN102436995A (en) * | 2011-10-25 | 2012-05-02 | 中国电子科技集团公司第四十一研究所 | Hall high voltage detection control method applied to traveling wave tube program control high voltage power supply |
| CN103533689A (en) * | 2012-07-06 | 2014-01-22 | 核工业西南物理研究院 | Titanium-pump power-supply system for large-power microwave vacuum tube |
| CN103743945A (en) * | 2014-01-17 | 2014-04-23 | 大连泰思曼科技有限公司 | Circuit and method for detecting load current of high-voltage pulse power supply |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106323541A (en) * | 2016-08-17 | 2017-01-11 | 成都凯赛尔电子有限公司 | Method for detecting vacuum degree of X-ray tube |
| CN106323541B (en) * | 2016-08-17 | 2019-01-08 | 成都凯赛尔电子有限公司 | The detection method of X-ray tube vacuum degree |
| CN107702847A (en) * | 2017-07-21 | 2018-02-16 | 浙江绍兴苏泊尔生活电器有限公司 | Vacuum detection method and system and cooking appliance |
| CN109387324A (en) * | 2017-08-08 | 2019-02-26 | 上海卓亚医疗科技有限公司 | A kind of accelerator vacuum level real-time monitoring system |
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|---|---|
| CN105517314B (en) | 2018-10-02 |
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