CN119355015A - CT test tube - Google Patents
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- CN119355015A CN119355015A CN202411932112.0A CN202411932112A CN119355015A CN 119355015 A CN119355015 A CN 119355015A CN 202411932112 A CN202411932112 A CN 202411932112A CN 119355015 A CN119355015 A CN 119355015A
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- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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Abstract
一种CT测试球管，包括：灯丝等效电路，其输入端输入实际CT球管工作时流经阴极灯丝的实际灯丝电流，其输出端输出与所述实际灯丝电流关联的等效电压；所述等效电压与所述实际灯丝电流的关联关系由所述阴极灯丝的实际电阻电流曲线确定；管电流等效电路，其输入端输入所述实际灯丝电流，其输出端输出等效管电流；所述等效管电流与所述实际灯丝电流的关联关系，由所述实际CT球管工作时的实际管电流与所述实际灯丝电流的关联关系确定。采用上述CT测试球管，能够输出实际CT球管的反馈数据，有效判断CT设备异常是由实际CT球管导致，还是由其他原因导致。
A CT test tube includes: a filament equivalent circuit, whose input end inputs the actual filament current flowing through the cathode filament when the actual CT tube is working, and whose output end outputs an equivalent voltage associated with the actual filament current; the correlation between the equivalent voltage and the actual filament current is determined by the actual resistance current curve of the cathode filament; a tube current equivalent circuit, whose input end inputs the actual filament current, and whose output end outputs an equivalent tube current; the correlation between the equivalent tube current and the actual filament current is determined by the correlation between the actual tube current and the actual filament current when the actual CT tube is working. The above-mentioned CT test tube can output feedback data of the actual CT tube, and effectively judge whether the abnormality of the CT equipment is caused by the actual CT tube or other reasons.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a CT test bulb tube.
Background
Computed tomography (Computed Tomography, CT) is a medical imaging technique in which CT imaging devices (also known as CT devices) scan an object tomographically using X-ray beams and generate detailed images of the internal structure of the object by means of computer processing. CT bulbs are key components in CT devices for generating X-ray beams for detecting objects. The CT bulb performance directly affects the sharpness of the resulting CT image and the stability of the CT device.
The CT bulb tube works in an environment with high temperature, high heat, high pressure, high vacuum and high gravitational acceleration. During operation, there are many risks of failure, such as abnormal filament, abnormal vacuum, anode stall or seizing, etc. The CT apparatus also includes a high voltage generator, which also has a risk of failure and thus not functioning properly. If an abnormality occurs in the CT apparatus, it is difficult to effectively distinguish whether the abnormality is caused by the CT bulb or by the high voltage generator.
Disclosure of Invention
The invention at least aims to provide a CT test bulb tube which can output feedback data of an actual CT bulb tube so as to judge whether the CT test bulb tube is abnormal or not due to the occurrence of the abnormality of the CT bulb tube.
The invention provides a CT test bulb tube, which comprises a filament equivalent circuit, a tube current equivalent circuit, an output end and a tube current equivalent circuit, wherein the input end of the filament equivalent circuit inputs an actual filament current flowing through a cathode filament when an actual CT bulb tube works, the output end of the filament equivalent circuit outputs an equivalent voltage related to the actual filament current, the association between the equivalent voltage and the actual filament current is determined by an actual resistance current curve of the cathode filament, the input end of the tube current equivalent circuit inputs the actual filament current, the output end of the tube current equivalent circuit outputs an equivalent tube current, and the association between the equivalent tube current and the actual filament current is determined by the association between the actual tube current and the actual filament current when the actual CT bulb tube works.
The filament equivalent circuit comprises a first resistor, a second resistor, a third resistor, a first operational amplifier and a first control unit, wherein the first resistor is used for inputting the actual filament current at a first end, a second end of the first resistor is coupled with a first input end of the first operational amplifier and an input end of the first control unit, the first operational amplifier is used for coupling a second input end of the first operational amplifier with the second resistor, an output end of the first operational amplifier is coupled with a second end of the third resistor, the first control unit is used for coupling an output end of the first control unit with a first end of the third resistor, the first control unit is suitable for controlling the first operational amplifier to output the equivalent voltage based on the actual filament current, and the second resistor is grounded at a second end.
Optionally, the filament equivalent circuit further comprises a first triode and a first diode, wherein an emitter of the first triode is coupled with an output end of the first control unit, a base of the first triode is coupled with a first end of the third resistor, a collector of the first triode is coupled with an anode of the first diode, and a cathode of the first diode is grounded.
The tube current equivalent circuit comprises a fourth resistor, a second control unit, a second operational amplifier, a fifth resistor and a sixth resistor, wherein the first end of the fourth resistor inputs the actual filament current, the second end of the fourth resistor is coupled with the first input end of the second operational amplifier and the input end of the second control unit, the second input end of the second operational amplifier is coupled with the fifth resistor, the output end of the second operational amplifier is coupled with the first end of the sixth resistor, the output end of the second control unit is coupled with the first end of the sixth resistor, the second control unit is suitable for controlling the second operational amplifier to output the equivalent tube current based on the actual filament current, and the second end of the fifth resistor is grounded.
Optionally, the tube current equivalent circuit further comprises a second triode and a second diode, wherein an emitter of the second triode is coupled with the output end of the second control unit, a base of the second triode is coupled with the first end of the sixth resistor, a collector of the second triode is coupled with the output end of the second operational amplifier, an anode of the second diode is coupled with the emitter of the second triode, and a cathode of the second diode is coupled with the collector of the second triode.
Optionally, the tube current equivalent circuit further comprises a first adjustable capacitor coupled between the collector of the second triode and the output end of the second operational amplifier.
Optionally, the sixth resistor is an adjustable resistor.
Optionally, the CT test bulb tube further comprises an equivalent three-phase induction motor circuit which is suitable for simulating the rotating speed value of the anode target disc in the actual CT bulb tube.
The equivalent three-phase induction motor circuit comprises an A-phase equivalent branch, a B-phase equivalent branch and a C-phase equivalent branch, wherein any equivalent branch comprises a first equivalent resistor, a first equivalent inductor, a second equivalent resistor, a second equivalent inductor, a third equivalent resistor, a third equivalent inductor and a variable resistor, wherein the first equivalent resistor is coupled with a corresponding phase in a three-phase motor input line in the actual CT bulb at a first end, the second equivalent inductor is coupled with a first end of the first equivalent inductor, the second end of the first equivalent inductor is coupled with a first end of the second equivalent resistor, the first end of the third equivalent resistor is coupled with a first end of the third equivalent inductor, the second end of the second equivalent resistor is coupled with a first end of the second equivalent inductor, the second end of the second equivalent resistor is coupled with a first end of the variable resistor, the second equivalent resistor is coupled with a second end of the second equivalent resistor, the second equivalent resistor is coupled with a second equivalent resistor, and the equivalent resistor is coupled with the second equivalent resistor, the resistance value of the variable resistor is the product of the resistance value of the second equivalent resistor and a first quotient value, wherein the first quotient value is the quotient of (1-s) and s, and s is the slip ratio of the motor.
Compared with the prior art, the invention has the following beneficial effects:
The CT test bulb tube comprises a filament equivalent circuit and a tube current equivalent circuit. And simulating an actual resistance current curve of a cathode filament of an actual CT bulb through a filament equivalent circuit. Thus, failure of the actual CT bulb tube due to instability of the cathode filament at high temperature can be avoided. Based on the association relation between the actual filament current and the actual tube current, the equivalent tube current is obtained through the simulation of the tube current equivalent circuit. The tube current equivalent circuit does not generate high heat, so that the CT bulb tube can be effectively prevented from being ignited and the condition of high temperature and high heat is avoided. And, adopt filament equivalent circuit and tube current equivalent circuit, also need not to keep the high vacuum in the die of CT bulb. Therefore, compared with an actual CT bulb, the CT test bulb does not need to work in a high-temperature and high-vacuum environment, so that the failure condition of the CT test bulb is greatly reduced. The CT test bulb tube is applied to a scene of CT equipment test, and the CT test bulb tube can simulate the output data of a normal actual CT bulb tube, so that whether the abnormality of the CT equipment is caused by the abnormality of the actual CT bulb tube can be effectively distinguished.
Drawings
FIG. 1 is a schematic view of a CT test bulb according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an actual resistive current profile of a cathode filament;
fig. 3 is a schematic diagram of a filament equivalent circuit in an embodiment of the present invention;
FIG. 4 is a graphical representation of the mapping of actual tube current to actual filament current;
FIG. 5 is a schematic diagram of a tube current equivalent circuit in an embodiment of the invention;
fig. 6 is a schematic diagram of an equivalent three-phase induction motor circuit in an embodiment of the present invention.
Detailed Description
As described in the background art, if an abnormality occurs in the CT apparatus, it is difficult to effectively distinguish whether the abnormality is caused by the CT bulb or the high voltage generator.
In the embodiment of the invention, the actual resistance current curve of the cathode filament of the actual CT bulb is simulated through a filament equivalent circuit. Thus, failure of the actual CT bulb tube due to instability of the cathode filament at high temperature can be avoided. Based on the association relation between the actual filament current and the actual tube current, the equivalent tube current is obtained through the simulation of the tube current equivalent circuit. The tube current equivalent circuit does not generate high heat, so that the CT bulb tube can be effectively prevented from being ignited and the condition of high temperature and high heat is avoided. And, adopt filament equivalent circuit and tube current equivalent circuit, also need not to keep the high vacuum in the die of CT bulb. Therefore, compared with an actual CT bulb, the CT test bulb does not need to work in a high-temperature and high-vacuum environment, so that the failure condition of the CT test bulb is greatly reduced. The CT test bulb tube is applied to a scene of CT equipment test, and the CT test bulb tube can simulate the output data of a normal actual CT bulb tube, so that whether the abnormality of the CT equipment is caused by the abnormality of the actual CT bulb tube can be effectively distinguished.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the invention provides a CT test bulb, and reference is made to FIG. 1.
As shown in fig. 1, the CT test bulb may include a filament equivalent circuit 1, a tube current equivalent circuit 2. The CT test bulb tube also comprises a cathode high-voltage insulating ceramic head 4, a cathode high-voltage cable 5, a pressure relief valve 6, an anode high-voltage cable 7, an anode high-voltage insulating ceramic head 8, a three-phase motor input line 9, a cooling oil path outlet 10, a temperature control switch 11, a cooling oil inlet 12 and the like.
In a specific implementation, the cathode high-voltage insulating ceramic head 4, the cathode high-voltage cable 5, the pressure release valve 6, the anode high-voltage cable 7, the anode high-voltage insulating ceramic head 8, the three-phase motor input line 9, the cooling oil path outlet 10, the temperature control switch 11, the cooling oil inlet 12 and the like can follow corresponding structures in an actual CT bulb, and the embodiment of the invention does not change the structures.
In the embodiment of the present invention, the actual CT bulb is a CT bulb actually used in a CT apparatus. The CT test bulb tube can simulate the working characteristic parameters of the actual CT bulb tube in normal working, and under the same working condition, the output data of the CT test bulb tube is the same or almost the same as the output data of the actual CT bulb tube.
That is, the CT test bulb provided in the embodiment of the present invention may be equivalent to an actual CT bulb. However, the CT test bulb in the embodiment of the invention is correspondingly modified relative to the actual CT bulb.
In practical application, the cathode filament in the practical CT bulb tube is made of tungsten metal, the filament diameter of the cathode filament is 0.2-0.3 millimeter (mm), and the length is 7-15 mm. The cathode filament is heated up rapidly when the working current is 4-7A, and emits hot electrons when the temperature is higher than 2500 ℃. By controlling the operating current input to the cathode filament, the temperature of the cathode filament can be made to be within a stable temperature range.
When the temperature of the cathode filament changes, the resistance of the cathode filament changes accordingly. Thus, at different filament currents, there is a corresponding resistance of the cathode filament.
As shown in fig. 2, a schematic diagram of the actual resistive current profile of the cathode filament is given. In fig. 2, the abscissa indicates the actual filament current of the cathode filament, and the ordinate indicates the resistance value of the cathode filament. The actual filament current is the filament current on the cathode filament when the actual CT tube works normally.
Based on fig. 2, it can be seen that as the current of the cathode filament increases, the temperature of the cathode filament increases, and the resistance of the cathode filament correspondingly increases.
In the embodiment of the invention, the equivalent voltage corresponding to the actual filament current can be simulated based on the actual resistance current curve of the cathode filament through the filament equivalent circuit.
In a specific implementation, when the CT test bulb is used, an actual filament current may be input to an input end of the filament equivalent circuit, and an equivalent voltage associated with the actual filament current may be output to an output end of the filament equivalent circuit. The quotient of the equivalent voltage and the actual filament current is the equivalent resistance of the cathode filament, so that the corresponding equivalent voltage can be determined based on the actual resistance current curve of the cathode filament and the actual filament current of the cathode filament.
Referring to fig. 3, a schematic diagram of a filament equivalent circuit in an embodiment of the present invention is provided.
In a specific implementation, the filament equivalent circuit may include a first resistor R1, a second resistor R2, a third resistor R3, a first operational amplifier OP1, and a first control unit, wherein:
The first end of the first resistor R1 inputs actual filament current, and the second end of the first resistor R1 is coupled with the first input end of the first operational amplifier OP1 and the input end of the first control unit;
The second input end of the first operational amplifier OP1 is coupled with the second resistor R2, and the output end of the first operational amplifier OP1 is coupled with the second end of the third resistor R3;
The output end of the first control unit is coupled with the first end of the third resistor R3, and the first control unit can control the output end of the first operational amplifier OP1 to output equivalent voltage based on the actual filament current;
the second end of the second resistor R2 is grounded.
In some embodiments, the first input of the first operational amplifier OP1 is a positive input "+", and the second input of the first operational amplifier OP1 is a negative input "-".
In a specific implementation, the filament equivalent circuit may further include a first triode N1 and a first diode D1, wherein:
The emitter of the first triode N1 is coupled with the output end of the first control unit, the base electrode of the first triode N1 is coupled with the first end of the third resistor R3, and the collector electrode of the first triode N1 is coupled with the anode of the first diode D1;
The cathode of the first diode D1 is grounded.
In summary, the actual resistance current curve of the cathode filament of the actual CT bulb is simulated through the filament equivalent circuit. Since the CT test bulb is used for testing only and does not need to emit hot electrons, the equivalent circuit does not need to be in a high temperature state like the cathode filament. Thus, the CT test bulb can avoid failure caused by instability of the cathode filament at high temperature.
In practical application, a tube voltage exists between an anode and a cathode of an actual CT bulb tube, and the tube voltage can reach 150kV. Under the double-end high-voltage mode, the cathode of the CT bulb tube is connected with high voltage of-75 kV, and the anode of the CT bulb tube is connected with high voltage of 75kV, so that after hot electrons generated by a cathode filament are accelerated, tube current is bombarded on an anode target plate, and X rays are generated. The intensity of the X-rays is related to the tube current, and the correlation between the actual filament current and the actual tube current at different tube voltages is called the emission curve of the actual CT bulb.
Referring to fig. 4, a schematic diagram of the mapping relationship between the actual filament current and the actual tube current, that is, a schematic diagram of the emission curve of the actual CT bulb is given. In fig. 4, the abscissa represents the actual filament current, and the ordinate represents the actual tube current. The mapping of actual filament current to actual tube current may be different at different tube voltages. At different tube voltages, as the actual filament current increases, the actual tube current correspondingly increases.
In an embodiment of the invention, a tube current equivalent circuit is provided. The input end of the tube current equivalent circuit can input actual filament current, the output end of the tube current equivalent circuit outputs equivalent tube current, and the association relation between the equivalent tube current and the actual filament current can be determined by the association relation between the actual tube current and the actual filament current.
Specifically, the correlation between the actual tube current and the actual filament current may be used as the correlation between the equivalent tube current and the actual filament current. Thus, the equivalent tube current corresponding to the actual filament current (equivalent tube current is equal to the actual tube current) can be obtained by the tube current equivalent circuit.
Referring to fig. 5, a schematic diagram of a tube current equivalent circuit in an embodiment of the present invention is provided.
In a specific implementation, the tube current equivalent circuit comprises a fourth resistor R4, a second control unit, a second operational amplifier OP2, a fifth resistor R5 and a sixth resistor R6, wherein:
The first end of the fourth resistor R4 inputs actual filament current, and the second end of the fourth resistor R4 is coupled with the first input end of the second operational amplifier OP2 and the input end of the second control unit;
the second input end of the second operational amplifier OP2 is coupled with the fifth resistor R5, and the output end of the second operational amplifier OP2 is coupled with the first end of the sixth resistor R6;
The second control unit is suitable for controlling the second operational amplifier OP2 to output equivalent tube current based on actual filament current;
The second terminal of the fifth resistor R5 is grounded.
In some embodiments, the first input of the second operational amplifier OP2 is a positive input "+", and the second input of the second operational amplifier OP2 is a negative input "-".
In a specific implementation, the tube current equivalent circuit may further include a second triode N2 and a second diode D2, where:
The emitter of the second triode N2 is coupled with the output end of the second control unit, the base electrode of the second triode N2 is coupled with the first end of the sixth resistor R6, and the collector electrode of the second triode N2 is coupled with the output end of the second operational amplifier OP 2;
The anode of the second diode D2 is coupled to the emitter of the second transistor N2, and the cathode of the second diode D2 is coupled to the collector of the second transistor N2.
In a specific implementation, the tube current equivalent circuit may further include a first adjustable capacitor C1, and the first adjustable capacitor C1 may be coupled between the collector of the second triode N2 and the output terminal of the second operational amplifier OP 2.
In a specific implementation, the sixth resistor R6 is an adjustable resistor. That is, the resistance value of the sixth resistor R6 is adjustable.
In practical applications, the structure between the cathode and the anode of the actual CT bulb is relatively complex. When the cathode and the anode of the actual CT bulb are connected with high voltage, the sparking phenomenon is easy to occur. When the hot electrons generated by the cathode filament get accelerated between the cathode and the anode, they bombard the anode target disk, and huge heat is generated. High heat can affect the stability of an actual CT bulb, such as the anode bearing, the vacuum in the die, and the sparking phenomenon can occur more easily.
In addition, the actual CT bulb belongs to an electric vacuum device, and in order to avoid ignition under high voltage as much as possible and facilitate generation of actual tube current, namely, to avoid blocking of electrons generated by a cathode filament when the electrons are transported to an anode, the tube core needs to be kept under high vacuum. Once the vacuum is broken or reduced, a sparking phenomenon or risk of oxidative fusing of the cathode filament will easily occur.
In the CT test bulb provided by the embodiment of the invention, the equivalent tube current related to the actual filament current is generated through the tube current equivalent circuit, so that high heat is not generated, high voltage is not needed, and ignition is not easy to occur. Therefore, the tube core in the high vacuum state is not needed in the CT test bulb, the tube core in the high vacuum state can be replaced by ceramic with better insulativity, and the occurrence of the sparking phenomenon can be avoided more easily.
In practical application, when the practical CT bulb tube works, hot electrons bombarded on the anode target disc can generate huge heat, and in order to avoid local high temperature, the anode target disc needs to rotate at a high speed under the drive of a stator coil, and the rotating speed can reach 8400-10500 revolutions per minute. However, the bearings will experience higher drag forces due to the high gravitational acceleration at the rotational speed of the CT machine frame. Moreover, as the temperature inside the actual CT bulb increases, the driving force of the stator coil may also be affected, which may further result in the influence of the rotational speed of the anode target disk, resulting in failure of the actual CT bulb.
The failure of the actual CT bulb in the embodiment of the present invention means that the actual CT bulb cannot work normally, or that the output data of the actual CT bulb is abnormal data. The failure of the actual CT bulb tube can also be called the abnormality of the actual CT bulb tube, the failure of the actual CT bulb tube, etc.
With continued reference to fig. 1, in an embodiment of the present invention, the CT test bulb may also include an equivalent three-phase induction motor circuit 3. The equivalent three-phase induction motor circuit 3 can be used to simulate the rotational speed value of the anode target disk in an actual CT bulb.
In a specific implementation, the equivalent three-phase induction motor circuit can comprise an A-phase equivalent branch, a B-phase equivalent branch and a C-phase equivalent branch, wherein any one of the equivalent branches comprises a first equivalent resistor, a first equivalent inductor, a second equivalent resistor, a second equivalent inductor, a third equivalent resistor, a third equivalent inductor and a variable resistor, wherein:
The first end of the first equivalent resistor is coupled with the corresponding phase of the three-phase motor input line in the actual CT bulb, and the second end of the first equivalent resistor is coupled with the first end of the first equivalent inductor;
The second end of the first equivalent inductor is coupled with the first end of the second equivalent resistor, the first end of the third equivalent resistor and the first end of the third equivalent inductor;
The second end of the second equivalent resistor is coupled with the first end of the second equivalent inductor;
the second end of the second equivalent inductor is coupled with the first end of the variable resistor;
the second end of the third equivalent resistor is coupled with the second end of the variable resistor;
The second end of the third equivalent inductor is coupled to the second end of the third equivalent inductor.
In specific implementation, the resistance value of the first equivalent resistor is the resistance value of a corresponding phase of a motor stator coil in an actual CT bulb, the inductance value of the first equivalent resistor is the inductance value of the corresponding phase of the motor stator coil, the resistance value of the second equivalent resistor is the resistance value of the corresponding phase when the motor rotor is reduced to the stator side, the inductance value of the second equivalent resistor is the inductance value of the corresponding phase when the motor rotor is reduced to the stator side, the resistance value of the third equivalent resistor is the resistance value of the iron core loss of the corresponding phase, the inductance value of the third equivalent resistor is the iron core magnetizing inductance value of the corresponding phase, the resistance value of the variable resistor is the product of the resistance value of the second equivalent resistor and the first quotient value, the first quotient value is the quotient of (1-s) and s, and s is the slip ratio of the actual three-phase induction motor.
Referring to fig. 6, a schematic diagram of an equivalent three-phase induction motor circuit in an embodiment of the present invention is provided.
In a specific implementation, the A-phase equivalent branch comprises a first equivalent resistor R A1, a first equivalent inductor X A1, a second equivalent resistor R A2, a second equivalent inductor X A2, a third equivalent resistor R A3, a third equivalent inductor X A3 and a variable resistor R P1, wherein:
The first end of the first equivalent resistor R A1 is coupled with the U-phase of the three-phase motor input line, and the second end of the first equivalent resistor R A1 is coupled with the first end of the first equivalent inductor X A1, wherein the resistance value of the first equivalent resistor R A1 is the resistance value of the A-phase of the motor stator coil in the actual CT bulb;
The second end of the first equivalent inductor X A1 is coupled with the first end of the second equivalent resistor R A2, the first end of the third equivalent resistor R A3 and the first end of the third equivalent inductor X A3, and the inductance value of the first equivalent inductor X A1 is the inductance value of the phase A of the stator coil of the motor;
The second end of the second equivalent resistor R A2 is coupled with the first end of the second equivalent inductor X A2, and the resistance value of the second equivalent resistor R A2 is the resistance value of the phase A when the motor rotor is reduced to the stator side;
The second end of the second equivalent inductor X A2 is coupled with the first end of the variable resistor R P1, and the inductance value of the second equivalent inductor X A2 is the inductance value of the phase A when the motor rotor is reduced to the stator side;
The second end of the third equivalent resistor R A3 is coupled with the second end of the variable resistor R P1, and the resistance value of the third equivalent resistor R A3 is the iron core loss resistance value of the A phase of the motor stator coil;
The second end of the third equivalent inductor X A2 is coupled with the second end of the third equivalent resistor R A3, and the inductance value of the third equivalent inductor X A2 is the iron core magnetizing inductance value of the A phase of the motor stator coil;
The resistance value of the variable resistor R P1 is the resistance value of the second equivalent resistor R A2 multiplied by (1-s)/s, and s is the slip ratio of the motor.
In a specific implementation, the B-phase equivalent branch circuit comprises a first equivalent resistor R B1, a first equivalent inductor X B1, a second equivalent resistor R B2, a second equivalent inductor X B2, a third equivalent resistor R B3, a third equivalent inductor X B3 and a variable resistor R P2, wherein:
The first end of the first equivalent resistor R B1 is coupled with the U-phase of the three-phase motor input line, and the second end of the first equivalent resistor R B1 is coupled with the first end of the first equivalent inductor X B1, wherein the resistance value of the first equivalent resistor R B1 is the resistance value of the B-phase of the motor stator coil in the actual CT bulb;
The second end of the first equivalent inductor X B1 is coupled with the first end of the second equivalent resistor R B2, the first end of the third equivalent resistor R B3 and the first end of the third equivalent inductor X B3, and the inductance value of the first equivalent inductor X B1 is the inductance value of the B phase of the stator coil of the motor;
The second end of the second equivalent resistor R B2 is coupled with the first end of the second equivalent inductor X B2, and the resistance value of the second equivalent resistor R B2 is the resistance value of the B phase when the motor rotor is reduced to the stator side;
the second end of the second equivalent inductor X B2 is coupled with the first end of the variable resistor R P2, and the inductance value of the second equivalent inductor X B2 is the inductance value of the B phase when the motor rotor is reduced to the stator side;
The second end of the third equivalent resistor R B3 is coupled with the second end of the variable resistor R P2, and the resistance value of the third equivalent resistor R B3 is the core loss resistance value of the B phase of the motor stator coil;
the second end of the third equivalent inductor X B2 is coupled with the second end of the third equivalent resistor R B3, and the inductance value of the third equivalent inductor X B2 is the magnetizing inductance value of the B phase iron core of the motor stator coil;
The resistance value of the variable resistor R P2 is the resistance value of the second equivalent resistor R B2 multiplied by (1-s)/s, and s is the slip ratio of the motor.
In a specific implementation, the C equivalent branch circuit comprises a first equivalent resistor R C1, a first equivalent inductor X C1, a second equivalent resistor R C2, a second equivalent inductor X C2, a third equivalent resistor R C3, a third equivalent inductor X C3 and a variable resistor R P3, wherein:
The first end of the first equivalent resistor R C1 is coupled with the U-phase of the three-phase motor input line, and the second end of the first equivalent resistor R C1 is coupled with the first end of the first equivalent inductor X C1, wherein the resistance value of the first equivalent resistor R C1 is the resistance value of the C-phase of the motor stator coil in the actual CT bulb;
The second end of the first equivalent inductor X C1 is coupled with the first end of the second equivalent resistor R C2, the first end of the third equivalent resistor R C3 and the first end of the third equivalent inductor X C3, and the inductance value of the first equivalent inductor X C1 is the inductance value of the C phase of the stator coil of the motor;
the second end of the second equivalent resistor R C2 is coupled with the first end of the second equivalent inductor X C2, and the resistance value of the second equivalent resistor R C2 is the resistance value of the C phase when the motor rotor is reduced to the stator side;
the second end of the second equivalent inductor X C2 is coupled with the first end of the variable resistor R P3, and the inductance value of the second equivalent inductor X C2 is the inductance value of the C phase when the motor rotor is reduced to the stator side;
The second end of the third equivalent resistor R C3 is coupled with the second end of the variable resistor R P3, and the resistance value of the third equivalent resistor R C3 is the core loss resistance value of the C phase of the motor stator coil;
The second end of the third equivalent inductor X C2 is coupled with the second end of the third equivalent resistor R C3, and the inductance value of the third equivalent inductor X C2 is the magnetizing inductance value of the C-phase iron core of the motor stator coil;
The resistance value of the variable resistor R P3 is that the resistance value of the second equivalent resistor R C2 is multiplied by (1-s)/s, and s is the slip ratio of the motor in the actual CT bulb.
In a specific implementation, the second end of the adjustable resistor R P1 of the a-phase equivalent branch is coupled to the second end of the adjustable resistor R P2 of the B-phase equivalent branch and the second end of the adjustable resistor R P3 of the C-phase equivalent branch.
In the embodiment of the invention, an equivalent three-phase induction motor circuit shown in fig. 6 is adopted, and the slip ratio of the motor is adjusted to simulate the feedback current output by the actual three-phase induction motor circuit, wherein the feedback current is used for representing the actual rotating speed value of the anode target disc.
Therefore, the actual rotating speed value of the anode target disc is simulated through the equivalent three-phase induction motor circuit, and the actual CT bulb tube failure caused by the influence of high temperature on the rotating speed of the anode target disc can be avoided.
In practical application, when the actual CT bulb is in operation, insulating oil used for cooling can be heated along with continuous loading of the power of the actual CT bulb. As the temperature of the insulating oil increases, its volume gradually increases. In order to avoid overheat and overvoltage of the actual CT bulb, a temperature control switch can be arranged in the actual CT bulb. And alarming when the temperature of the insulating oil exceeds the safety temperature, and disconnecting the power loading of the actual CT bulb. And opening the pressure relief valve when the pressure relief valve reaches a pressure threshold value.
In the embodiment of the present invention, since the CT test bulb does not need to operate in a high-pressure, high-temperature and high-heat environment, in fig. 1, the CT test bulb may retain the temperature control switch 11 and not retain the pressure release valve 6. Or the CT test bulb may not retain the temperature control switch 11 and the pressure relief valve 6.
In summary, the CT test bulb provided by the embodiment of the invention does not need to work in environments with high temperature, high heat, high pressure, high vacuum and high gravity acceleration, so that the failure caused by abnormal filament, abnormal vacuum degree, anode stall or clamping and the like can be avoided, and the output data of the actual CT bulb can be normally output. Therefore, when the CT equipment is abnormal, the CT test bulb tube can be adopted to replace the actual CT bulb tube, so that the abnormality can be removed.
After replacing the actual CT bulb with the CT test bulb, if the CT device still has an abnormality, it can be determined that the abnormality of the CT device is not caused by the actual CT bulb, and if the CT device does not have an abnormality, it can be determined that the abnormality of the CT device is caused by the actual CT bulb. This can effectively improve the detection efficiency of the cause of the abnormality of the CT apparatus.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (9)
1. A CT test bulb comprising:
The input end of the filament equivalent circuit inputs the actual filament current flowing through the cathode filament when the actual CT bulb tube works, and the output end of the filament equivalent circuit outputs equivalent voltage related to the actual filament current;
and the incidence relation between the equivalent tube current and the actual filament current is determined by the incidence relation between the actual tube current and the actual filament current when the actual CT bulb tube works.
2. The CT test bulb as set forth in claim 1, wherein the filament equivalent circuit comprises a first resistor, a second resistor, a third resistor, a first operational amplifier, and a first control unit, wherein:
the first end of the first resistor is input with the actual filament current, and the second end of the first resistor is coupled with the first input end of the first operational amplifier and the input end of the first control unit;
the second input end of the first operational amplifier is coupled with the second resistor, and the output end of the first operational amplifier is coupled with the second end of the third resistor;
the output end of the first control unit is coupled with the first end of the third resistor; the first control unit is suitable for controlling the first operational amplifier to output the equivalent voltage based on the actual filament current;
The second resistor is grounded at the second end.
3. The CT test bulb as set forth in claim 2, wherein said filament equivalent circuit further comprises a first triode and a first diode, wherein:
The emitter of the first triode is coupled with the output end of the first control unit, the base of the first triode is coupled with the first end of the third resistor, and the collector of the first triode is coupled with the anode of the first diode;
The cathode of the first diode is grounded.
4. The CT test bulb as set forth in claim 1, wherein the tube current equivalent circuit comprises a fourth resistor, a second control unit, a second operational amplifier, a fifth resistor, and a sixth resistor, wherein:
the first end of the fourth resistor inputs the actual filament current, and the second end of the fourth resistor is coupled with the first input end of the second operational amplifier and the input end of the second control unit;
The second operational amplifier has a second input end coupled to the fifth resistor and an output end coupled to the first end of the sixth resistor;
the second control unit is suitable for controlling the second operational amplifier to output the equivalent tube current based on the actual filament current;
the second end of the fifth resistor is grounded.
5. The CT test bulb as in claim 4, wherein the tube current equivalent circuit further comprises a second triode and a second diode, wherein:
the emitter of the second triode is coupled with the output end of the second control unit, the base of the second triode is coupled with the first end of the sixth resistor, and the collector of the second triode is coupled with the output end of the second operational amplifier;
and the anode of the second diode is coupled with the emitter of the second triode, and the cathode of the second diode is coupled with the collector of the second triode.
6. The CT test bulb as in claim 5, wherein the tube current equivalent circuit further comprises a first adjustable capacitor coupled between a collector of the second triode and an output of the second operational amplifier.
7. The CT test bulb according to claim 5, wherein the sixth resistor is an adjustable resistor.
8. The CT test bulb according to claim 1, further comprising:
and the equivalent three-phase induction motor circuit is suitable for simulating the rotating speed value of the anode target disc in the actual CT bulb tube.
9. The CT test bulb as set forth in claim 8, wherein the equivalent three-phase induction motor circuit comprises an A-phase equivalent branch, a B-phase equivalent branch and a C-phase equivalent branch, any of which comprises a first equivalent resistor, a first equivalent inductor, a second equivalent resistor, a second equivalent inductor, a third equivalent resistor, a third equivalent inductor and a variable resistor, wherein:
the first equivalent resistor is coupled with the corresponding phase of the three-phase motor input line in the actual CT bulb tube at the first end, and is coupled with the first end of the first equivalent inductor at the second end;
The second end of the first equivalent inductor is coupled with the first end of the second equivalent resistor, the first end of the third equivalent resistor and the first end of the third equivalent inductor;
the second end of the second equivalent resistor is coupled with the first end of the second equivalent inductor;
the second equivalent inductor is coupled with the first end of the variable resistor at the second end;
the second end of the third equivalent resistor is coupled with the second end of the variable resistor;
the second end of the third equivalent inductor is coupled with the second end of the third equivalent inductor;
The resistance value of the first equivalent resistor is the resistance value of a corresponding phase of a motor stator coil in the actual CT bulb, the inductance value of the first equivalent resistor is the inductance value of the corresponding phase of the motor stator coil, the resistance value of the second equivalent resistor is the resistance value of the corresponding phase when the motor rotor is reduced to the stator side, the inductance value of the second equivalent resistor is the inductance value of the corresponding phase when the motor rotor is reduced to the stator side, the resistance value of the third equivalent resistor is the iron core loss resistance value of the corresponding phase, the inductance value of the third equivalent resistor is the iron core magnetizing inductance value of the corresponding phase, the resistance value of the variable resistor is the product of the resistance value of the second equivalent resistor and a first quotient value, the first quotient value is the quotient of (1-s) and s, and s is the slip ratio of the motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411932112.0A CN119355015B (en) | 2024-12-26 | 2024-12-26 | CT test tube |
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| CN202411932112.0A CN119355015B (en) | 2024-12-26 | 2024-12-26 | CT test tube |
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| CN119355015B CN119355015B (en) | 2025-05-27 |
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| US4318165A (en) * | 1980-04-21 | 1982-03-02 | General Electric Company | Resonant-flyback power supply with filament winding for magnetron and the like loads |
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| CN119355015B (en) | 2025-05-27 |
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