CN207675302U - The light radiation monitoring device of High-Power Microwave cavity - Google Patents

Abstract

The utility model discloses a kind of light radiation monitoring devices of High-Power Microwave cavity, including power interface, further include：Shielding box；The upper circuit board of top in box, including power module and self-checking circuit；Lower circuit board below box body; including photoelectric conversion probe, I V conversion circuits, filter module, signal judgment module, alarming logic judgment module; after photoelectric conversion probe converts optical signals to electric signal; input I V conversion circuits; filter module is amplified signal voltage by amplifying circuit; signal judgment module converts analog signal to logic level signal, and the logic level signal is linked into protection system by alarming logic judgment module；SMA interfaces；Light sensing is popped one's head in；Cooling fin.Compared with prior art, the utility model has the following advantages：(1) stability is high, fast response time；(2) easy to operate, design cost is low, easy for installation.

Description

The light radiation monitoring device of High-Power Microwave cavity

Technical field

The utility model is related to light radiation monitoring device more particularly to the light radiation monitoring devices of High-Power Microwave cavity.

Background technology

It is more than the strong electromagnetic pulse of 100MW, frequency range between 1G-300GHz that High-Power Microwave HPM, which refers to instantaneous power, Have the characteristics that high-frequency, short pulse and high-power；It has important answer in terms of military, industrial equipment and scientific research With especially in high current particle accelerator, usually choosing driving source of the high-power microwave source as cavity.In actual working environment In, it can be led due to the factors such as imperfect in power transmission equipment manufacturing process when High-Power Microwave transmits in vacuum environment Cause the generation of multipactor or arc discharge effect.The generation of both effects all can be in running order High-frequency transmission equipment damages, or even partial short-circuit or local temperature is caused to increase, and destroys and needs the super of stable extremely low temperature The working environment of guide cavity.Therefore, it when transmitting HIGH-POWERED MICROWAVES under vacuum conditions, needs to monitor both effects in real time, so as to The timely rupturing duty circuit when a certain effect occurs avoids causing the long-time damage to microwave transmission medium surface.

It is all adjoint during multipactor effect caused by being transmitted by High-Power Microwave and arc discharge effect The release of high-energy, therefore can send out radiation in a manner of light.It differs only in two kinds of effects to the visible of external radiation The wavelength of light is different, and a kind of partially yellow visible light that radiation is wavelength 580nm, the purple partially that another kind radiation is wavelength 460nm can It is light-exposed.Therefore effectively both effects can be measured in real time using optical detector technology, to reach the important reality of protection Equipment is tested, maintenance cost is reduced and improves the purpose of experimental precision.

The measure of traditional reduction multipactor or arc discharge effect has following two：(1) by changing The mechanical structure of kind equipment, cavity use special material, or in the surface coating of cavity, enable to reduce generating secondary electricity Son or arc discharge effect.The method is more demanding to the processing technology of microwave cavity, and cost is higher, and can not be real Now completely inhibit multipactor or arc discharge effect so that High-Power Microwave cavity still needs a set of protection Scheme.(2) using the device for monitoring and limiting electrical arcing, power circuit can timely be disconnected.However current existing solution Certainly in scheme, the overwhelming majority is that optical signal is sent to the transducing signal observation circuit in a distant place using optical fiber, when optical fiber is impaired When, it needs frequently to replace component, improves manpower and hardware cost；In addition, by the High-Power Microwave chamber institute of particle accelerator There are certain radiation for the working environment at place, thus need to reduce system failure incidence, and then reduce the number of manual operation, Cause using limited.Therefore, the multipactor in High-Power Microwave cavity and the monitoring of arc discharge effect and report Police has become urgent problem to be solved.

Utility model content

Purpose of utility model：The light radiation monitoring that the purpose of this utility model is to provide a kind of High-Power Microwave cavity is set It is standby, to solve the problems, such as that multipactor in High-Power Microwave cavity and arc discharge effect monitor and alarm.

Technical solution：Monitoring device includes power interface, further includes：

Shielding box；

Upper circuit board, including power module and self-checking circuit, upper circuit board are mounted on upper end in shielding box；

Lower circuit board, including photoelectric conversion probe, I-V conversion circuits, filter module, signal judgment module, alarming logic Judgment module；Lower circuit board is mounted on lower end in shielding box；After the optical signal of acquisition is converted to electric signal by photoelectric conversion probe, Input I-V conversion circuits；Filter module carries out low pass frequency-selecting to the signal by amplification, filters out high-frequency signal, retains direct current letter Number；Signal judgment module converts analog circuit signal to logic level signal；Alarming logic judgment module is by the logic level Signal is linked into protection system as hardware alarms signal；

SMA interfaces, including TTL delivery outlets, LVDS delivery outlets, LVDS delivery outlets and reset signal input port, SMA interfaces are set It sets on the outside of shielding box box body；

Light sensing is popped one's head in, and light sensing probe is mounted on the outer side-lower of shielding box box body, converts optical signal into electric signal；

Cooling fin is fixed between upper and lower circuit plate.

Further include signal selector, signal selector is connect with photoelectric conversion probe and self-checking circuit.

Alarming logic judgment module includes transistor-transistor logic TTL delivery outlets and low-voltage differential signal LVDS defeated Outlet；When no alarm, TTL exports high level signal, and when alarm exports low level signal；And LVDS exports one when no alarm To difference high level signal, when alarm, exports a pair of of difference low level signal.

Operation principle：The utility model is the light radiation monitoring designed by the High-Power Microwave cavity based on particle accelerator Equipment, by installing this equipment in High-Power Microwave transmission device tube chamber, using the inspection light working characteristics of equipment, to realize Monitoring High-Power Microwave HPM transmission device optical radiation effects in real time, and protect the effect of High-Power Microwave cavity equipment.

Amplified by adjustable magnification operational amplifier specifically by by the collected small-signal of optical sensor, then will put Signal after big carries out a series of signal processing, final to obtain required control signal to the light radiation in High-Power Microwave cavity It is monitored.Equipment is broadly divided into signal acquisition, amplification filtering, signal judgement and four parts of hardware alarms；Wherein signal obtains Part is taken to be realized by optical sensor；Amplification filtering part carries out the small-signal voltage that sensor acquires by amplifying circuit Amplification；Signal judgment part uses digital trigger, and analog circuit signal is converted to logic level signal, and by the logic Signal is linked into protection system as hardware alarms signal.

Advantageous effect：Compared with prior art, the utility model has the following advantages：(1) High-Power Microwave is monitored in real time The working condition of HPM transmission devices, stability is high, fast response time；(2) easy to operate, design cost is low, installation side Just；(3) detectable signal gain controllable；(4) signal decision logic threshold value is adjustable, and system sensitivity is high.

Description of the drawings

Fig. 1 is monitoring device structural schematic diagram；

Fig. 2 is circuit module and signal processing flow schematic diagram；

Fig. 3 is I-V conversions and filter circuit；

Fig. 4 is that signal judges and alarming logic decision circuitry.

Specific implementation mode

As shown in Figure 1, in light radiation monitoring device, 7 be radiation protection lead screen box, this shielding box is according to upper and lower circuit board Design, to reduce influence of the various high-energy radiations of environment to circuit；1 is upper circuit board, includes mainly power module and self-test Circuit is mounted on top in lead screen box 7；2 be lower circuit board, is mounted on lower section in lead screen box 7, includes mainly opto-electronic conversion Probe 8, I-V conversion circuits 10, filter module 11, signal judgment module 12 and alarming logic judgment module 13；Wherein photoelectricity turns It changes after the optical signal of acquisition is converted to electric signal by probe 8, input I-V conversion circuits 10, filter module 11 is to by amplification Signal carries out low pass frequency-selecting, filters out high-frequency signal, retains direct current signal；Signal judgment module 12 converts analog circuit signal to Logic level signal；Logic level signal is linked into protection system by alarming logic judgment module 13.

3 be arranged on the outside of 7 box body of lead screen box are four SMA interfaces, are followed successively by Transistor-Transistor from left to right and patrol Collect TTL delivery outlets, low-voltage differential signal LVDS delivery outlets, LVDS delivery outlets and the input ports reset signal RESET；4 pass for light Sense probe, is mounted below box body side, using Photodiode S1223Series in this module；5 be copper sheet material The cooling fin of matter is fixed between circuit board 1 and lower circuit board 2；6 be micro-USB power interfaces, is mounted on lead screen box Top on the outside of 7 box body.Monitoring device has the function of startup self-detection, to judge the work of the entire circuit in addition to light sensing probe 4 Make whether state is normal, to ensure the normal operation of system.

As shown in Fig. 2, circuit module includes following 3 part；

(1) photosignal conversion circuit, signal selector and self-test signal part

Using Photodiode S1223Series in this module, optical signal is converted by photoelectric conversion probe 8 For current signal, after exporting the Weak current signal sensed, then it is output to back-end circuit；Wherein 14 front end of self-test signal line with 3.3V voltages connect；Signal selector 9 is a selecting switch element, is connect with photoelectric conversion probe 8 and self-test signal line 14, Signal selector 9 can select self-test signal or actual signal being sent into next stage circuit.

(2) I-V conversion circuits and filter module

I-V conversion circuits 10 and filter module 11 are amplified by the way that the current signal of input is converted to voltage signal Mode obtain ideal voltage signal；This circuit realizes weak current to desired voltage signal using impedance amplifying method Conversion.The real-time responsiveness that circuit is paid close attention in I-V conversions is realized on the basis of ensureing near-linear and is quickly turned to input signal Change and low noise sonication.

As shown in figure 3, in I-V conversions and filter circuit, the output current signal of optical sensor probe 4 passes through input terminal Original signal is sent into the ungrounded end of 5.1M Ω resistance 22 by mouth 17, and the other end of resistance 22 is connected with ground wire；50k Ω resistance 18 are connected with 19 reverse port of LT1057 operational amplifiers, and wherein 19 positive port of operational amplifier connects through the Europe 10k-50k resistance Ground；The inverting input of the output termination adjustable feedback of operational amplifier 19 resistance 15；The compensating electric capacity 16 of 1pF and adjustable feedback electricity Resistance 15 is in parallel；19 output end of operational amplifier forms low-pass filter via the 1pF capacitances of 160k Ω resistance 20 and one end ground connection Signal is exported to next stage by port 21 afterwards.

(3) signal judgment module and alarming logic judgment module

As shown in figure 4, the signal judgment module 12 and alarming logic judgment module 13 are to after front end amplification is filtered Output signal carry out condition judgment, LM339 chips 24,10k Ω resistance 33, threshold value control resistance 34,3k Ω resistance 35 and Power supply signal 23,31 forms threshold comparator, and when output signal 21 is more than given threshold, output signal 32 is by low transition For 5.0V high level, corresponding TTL and LVDS signals are separately converted to by d type flip flop 25 and LVDS chips 27.Wherein LM339 The normal phase input end mouth of chip 24 is connected with the output port 21 in Fig. 3；33 one end of 10k Ω resistance is connected with ground wire 23, separately One end is connected with 24 inverting input of LM339 chips；34 one end of threshold value control resistance is connected with electric signal+5.0V31, the other end It is connected with 24 inverting input of LM339 chips；35 one end of 3k Ω resistance is connected with electric signal+5.0V31, the other end and LM339 cores 24 output signal 32 of piece is connected；The clock signal port of d type flip flop 25 is connected with the output signal 32 of LM339 chips 24；The ports D Electric signal+5.0V31 is met, port CLR connects reset signal 30, port SET connections ground wire 23；When trigger captures front end electricity When the signal pulse that road is sent out, the ports Q export high level, andPort exports low level to TTL interfaces, while by the signal The ports A of LVDS chips 27 are sent into, differential signal is converted to through differential output signal X 28, differential output signal Y29 through chip Port exports, and the port VCC and EN of chip 27 connects the signal source 36 of 3.3V.

Judge, in alarming logic decision circuitry, the filtered signal of previous stage to be input to type by port 21 in signal Number be LM339 threshold comparator one end；Threshold comparator is by being arranged a threshold voltage and compared with amplified signal to produce A raw trigger signal, the other end are linked into the ends clock CLK of trigger again；Trigger model CD4013, output end For Q withThe external reset circuit in the ports reset RST of CD4013 chips；It is connected to TTL output ports, while by the signal The LVDS signal chips 27 for being connected to model SN65LVDS104 generate LVDS difference alarm signals.Alarming logic judgment module 13 begin to respond in device fails, until hardware reset or remote software reset.

This equipment supplies+5V voltages by way of micro-USB power supplies, and by chip MC34063 output -5V, together When use LM3940IT chip outputs+3.3V.

Claims (5)

1. a kind of light radiation monitoring device of High-Power Microwave cavity, including power interface, it is characterised in that：Further include：

Shielding box (7)；

Upper circuit board (1), including power module and self-checking circuit, the upper circuit board (1) are mounted on shielding box (7) interior upper end；

Lower circuit board (2), including photoelectric conversion probe (8), I-V conversion circuits (10), filter module (11), signal judgment module (12) and alarming logic judgment module (13)；The lower circuit board (2) is mounted on shielding box (7) interior lower end；The opto-electronic conversion After the optical signal of acquisition is converted to electric signal by probe (8), I-V conversion circuits (10) are inputted；The filter module (11) is to warp The signal for crossing amplification carries out low pass frequency-selecting, filters out high-frequency signal, retains direct current signal；The signal judgment module (12) will simulate Circuit signal is converted into logic level signal；The alarming logic judgment module (13) is using logic level signal as hardware alarms Signal is linked into protection system；

SMA interfaces (3) on the outside of shielding box (7) box body are set, including the transistor-transistor logic TTL being arranged in order defeated Outlet, low-voltage differential signal LVDS delivery outlets, low-voltage differential signal LVDS delivery outlets and the input ports reset signal RESET；

The light sensing probe (4) of electric signal is converted optical signal into, the light sensing probe (4) is mounted on shielding box (7) box body Outer side-lower；

Cooling fin (5), is fixed between upper and lower circuit board.

2. the light radiation monitoring device of High-Power Microwave cavity according to claim 1, it is characterised in that：It further include signal Selector (9), the signal selector (9) are mounted on lower circuit board (2), connect with photoelectric conversion probe (8) and self-checking circuit It connects.

3. the light radiation monitoring device of High-Power Microwave cavity according to claim 1, it is characterised in that：The cooling fin (5) it is copper radiating rib.

4. the light radiation monitoring device of High-Power Microwave cavity according to claim 1, it is characterised in that：The alarm is patrolled Volume judgment module (13) includes transistor-transistor logic TTL delivery outlets and low-voltage differential signal LVDS delivery outlets, described TTL delivery outlets export high level signal in alarm free, and when alarm exports low level signal；LVDS delivery outlets are defeated in alarm free Go out a pair of of difference high level signal, when alarm exports a pair of of difference low level signal.

5. the light radiation monitoring device of High-Power Microwave cavity according to claim 1, it is characterised in that：The shielding box (7) it is lead screen box.