CN2430670Y - Intelligent multi-way gamma-ray level indicator - Google Patents

Abstract

The utility model relates to an intelligent multichannel gamma-ray level indicator, which comprises a casing, a gamma-ray source, a detector, a signal pretreatment circuit, a real-time data acquisition circuit, a keyboard, a display interface circuit, a control output circuit and a power circuit. The utility model is characterized in that the real-time data acquisition circuit comprises an MCS-51 series or compatible chip which is used as a microprocessor, a programmable counting chip, a latched chip, a decoder chip, a program run state subcircuit and a reset control subcircuit. The level indicator can be widely applied in the liquid and solid level detection of sealed container and equipment in building material industry and chemical industry. The utility model has the advantages of reliable detection, high automated program, time saving and labour intensity reduction.

Description

Intelligence hyperchannel gamma-rays level-sensing device

The utility model relates to a kind of level-sensing device of non-cpntact measurement, particularly relates to a kind of intelligent hyperchannel gamma-rays level-sensing device.As everyone knows, in building materials industry such as Cement Production, the various reaction closed containers of chemical engineering industry, the running status of water isolation pump in the ash disposal workshop, fuel-burning power plant, for guaranteeing high-level efficiency, safety in production is able to normal trouble-free operation, material level state in the closed container is detected, be safety in production, enhance productivity that one of most important link reduces production costs.The ray that utilizes gamma-ray radiation source to send passes measured medium and is absorbed, and transmitted intensity will change, and by the different information of measurement and processing ray intensity, can calculate the position of the material in the container.

Utilize ray to detect the ultimate principle of material level (or claiming the thing position) height; After ray passed tested material, its radiation intensity changed with the variation of thing position, and exponential damping law is followed in the decay of transmitted intensity in material.

I=I ₀e ^-μm·ρ·d……(1)

In the formula: I ₀: transmitted intensity when not adorning material for container

I: be transmitted intensity behind the container dress material

D: be material thickness

μ _m: be the total absorption coefficient of material to ray

ρ: be the density of material

Taken the logarithm and can get in (1) formula both sides

d=(1／μ _m·ρ)(lnI ₀-lnI)……(2)

By (2) formula as can be known the ray thickness that passes material be the logarithmic relationship of transmitted intensity.So by to passing the measurement of material transmitted intensity, can be in the hope of material thickness, thus calculate height of materials.

Once in application " hyperchannel γ thing position measurement and control instrument " in 1987, the patent No. was: 87210887.2 in this institute.The advantage of this measurement and control instrument is: circuit structure is simple, compactness, reliability height.Its blemish in an otherwise perfect thing is: 1, do not contain microprocessor in the circuit, this survey controller does not have intelligent processing capacity; 2, instrument has only three passages, and port number is less, uses to be subjected to certain limitation; 3, each passage is separate, and in the time will increasing passage, instrument is bulky, and cost is higher, uses inconvenient.

The purpose of this utility model is: design and manufacture the hyperchannel gamma-rays level-sensing device with intelligent processing capacity.

The technical solution of the utility model is: a kind of intelligent hyperchannel gamma-rays level-sensing device, contain casing, gamma ray projector, detector, signal pre-processing circuit, real-time data acquisition circuit, keyboard and display interface circuit, controlling output circuit, power circuit, the real-time data acquisition circuit contains MCS-51 series or its clone as microprocessor, the programmable count chip, the latch chip, decoder chip, running state of programs detects electronic circuit, and the control electronic circuit resets.The OPADD signal of microprocessor connects the data input pin of decoder chip, code translator connects the address signal that produces respectively the address selection end of programmable counter chip, the OPADD signal of microprocessor connects the data input pin of latch chip, latch connects address signal at the address end of program counter, the data terminal of microprocessor, the read-write control end, be connected with signal pre-processing circuit count pulse output terminal respectively, the output control signal of microprocessor connects running state of programs and detects the electronic circuit control end, detect the output control signal of electronic circuit, receive the control end of the control electronic circuit that resets, the control electronic circuit output reset signal that resets connects the reset terminal of microprocessor.

In the real-time data acquisition circuit, microprocessor MCS-51 device series clone can have 8751,8752,8032,87C51, and 80C31, AT89C51, the programmable counter chip can be 8253, and the latch chip can be 74LS373, and decoder chip can be 74LS138.

Chip 8253 can be with a slice or two, or three, every contains 3 counters, the output PRE of signal pre-processing circuit ₀～PRE ₈By or the P of door 74CS32 and AT89C51 or 8751 ₁₇Logical inverse carry out inclusive-OR operation, then as 8253 clock signal, with 8253 CLK ₀, CLK ₁, CLK ₂End connects, every 8253 GATE ₂Termination power Vcc, 8253 and AT89C51 or 8751 between, D ₀～D ₇End and P ₀₀～P ₀₇Join, both RD, WR end links to each other every 8253 A ₀, A ₁The Q of end and 74LS373 ₀, Q ₁Connect, from bottom to top 8253 CS end respectively with the Y of 74LS138 ₂, Y ₃, Y ₄Join the D of 74LS373 _0-～D ₇End and AT89C51 or 8751 P ₀₀～P ₀₇Connect, the LE end links to each other with the ALE/P end, AT89C51 or 8751 P ₂₅, P ₂₆, P ₂₇End respectively with the A of 74LS138, B, C holds connection, the E of 74LS138 ₃Termination power Vcc.

Frame of broken lines A is that running state of programs detects electronic circuit, and time base circuit piece NE555 produces the rectangular wave clock signal, and output pin Q is connected to the clock end CLK of binary counter 74LS93 ₀On, the MR of 74LS93 ₁End is by the P of electric capacity and AT89C51 or 8751 ₁₆End connects, and regularly 74LS93 is carried out clear operation.

Frame of broken lines B is the control electronic circuit that resets, the Q of 74LS93 ₃With electric capacity keep apart by or the door 74LS32 carry out receiving on the reset terminal RESET of AT89C51 or 8751 after the computing.

Keyboard and display interface circuit contain data storage HK1225, keyboard and display chip 8279, and bidirectional bus transmitter/receiver 74LS245, code translator 74LS138, trigger 74LS377, frame of broken lines C are keyboard, and charactron.

Between HK1225 and the AT89C51 or 8751, D ₀～D ₇The end respectively with P ₀₀～P ₀₇Connect A ₈～A ₁₂The end respectively with P ₂₀～P ₂₄Connect, the OE end is connected with the PSEN end by 74LS00, and the WE end links to each other the CS of HK1225 with the WR end ₂, CS ₁Meet the Y of Vcc and 74LS138 respectively ₀End links to each other, the A of HK1225 ₀～A ₇Respectively with the Q of 74LS373 ₀～Q ₇Connect 8279 DB ₀～DB ₇Respectively with the P of AT89C51 or 8751 ₀₀～P ₀₇Connect the Y of the 74LS138 of CS end and real-time data acquisition circuit ₅End connects, and RD, WR, CLK are connected the C of reset control circuit with RD, WR, the ALE/P end of AT89C51 or 8751 respectively _3-2Link to each other with 8279 reset terminal RESET, provide electrification reset or push-button reset signal for 8279.8279 IRQ end is by Sheffer stroke gate 74LS ₀₀The INT of back and AT89C51 or 8751 ₁Connect, for microprocessor provides look-at-me.8279 OUTB ₀～OUTB ₃And OUTA ₀～OUTA ₃Respectively with 74LS245U ₁₄B ₀～B ₃And B ₇-B ₄End connects, SL ₀～SL ₂Respectively with the A of 74LS138, B, C holds connection, RL ₀～RL ₂Link to each other 74LS245U with empty frame C keyboard ₁₄A ₀～A ₇The A that connects charactron respectively, B, C, D, E, F, G, H end, the Y of 74LS138 ₀～Y ₂Connect 74LS245U ₁₃B ₀～B ₂, the empty frame C of keyboard meets Y ₀, Y ₁, 74LS245U ₁₃A ₀～A ₃Connect the COM end of charactron respectively, output terminal OUTPUT ₀Meet the P of AT89C51 or 8751 ₁₅, OUTPUTi, i=1～8 meet the Q of 74LS377 respectively ₀～Q ₇, the CLK of 74LS377 meets the WR of AT89C51, and E meets the Y of 74LS138 ₁

Controlling output circuit adopts electromagnetic relay J or solid-state relay TACO25D as the control output interface, with the output OUTPUTi of the 74LS377 in keyboard and the display circuit, and i=1～2 or 1～5 or 1～8, computer processor AT89C51 or 8751 P ₁₅Output OUTPUT ₀As input signal, drive optocoupler 4n25 through impact damper 7407, utilize light emitting diode D ₁₄₀₁Or D ₁₄₀₂Indication control output state drives triode at last and drives array MC1413 or triode 9013, meets electromagnetic relay J or solid-state relay TACO25D again.

Power circuit is through transformer, rectifier bridge T ₁, T ₂, T ₃, T ₄, integrated package of pressure-stabilizing MC7812, MC7805, MC7912 provides+12V ,+5V, the DC voltage of-12V, the output voltage of change integrated package of pressure-stabilizing LM317 is through triode BG ₁₆₀₁, transformer TR ₁₆₀₁, coil L ₁₆₀₁After, for detector provides high-voltage dc voltage+HV.

Signal pre-processing circuit, detector adopts sodium iodide crystal and photomultiplier GDB44, and electric pulse is through circuit BG ₃₀₁After the BG302 amplification, output DET _oSignal, again through the main amplifying circuit integrated transporting discharging, LM318 carries out anti-phase ratio and amplifies, and exports PRE at last through comparer LM393 again _oSignal, PRE _o8253 CLK in 74HC32 input real-time data acquisition circuit ₀

Embodiment of the present utility model will have good effect: 1, intelligent hyperchannel gamma-rays level-sensing device, have microprocessor, and programmed control, the automaticity height under the situation that does not change hardware, by programming, can enlarge the function of instrument;

2, instrument has hyperchannel, and the procedure sharing of data acquisition and processing (DAP) part does not have direct corresponding relation between control output and each passage, is determined the form of control output fully by program;

3, this level-sensing device highly versatile, under the situation of not doing to change at hardware, instrument can be done the hyperchannel stuff level switch and measure and linear measurement, can superpose to each channel signal again, realizes the linear measurement of super large range material level.

Fig. 1 (a): switching regulator single channel single-point detection and localization gamma ray projector and detector scheme of installation;

Fig. 1 (b): switching regulator hyperchannel detection and localization γ float radiographic source and detector scheme of installation;

Fig. 2 (a): single-point source single channel wide range linearity test gamma ray projector and detector scheme of installation;

Fig. 2 (b): single-point source binary channels wide range linearity test gamma ray projector and detector scheme of installation;

Fig. 3: detector is a photomultiplier positive voltage operating circuit synoptic diagram;

Fig. 4: detector is a photomultiplier negative voltage operating circuit synoptic diagram;

Fig. 5: detector is a counter tube positive voltage operating circuit synoptic diagram;

Fig. 6: photomultiplier single channel signal pre-process circuit synoptic diagram;

Fig. 7: nine passages, 8751 real-time data acquisition circuit diagrams;

Fig. 8: six passages, 8751 real-time data acquisition circuit diagrams;

Fig. 9: triple channel 8751 real-time data acquisition circuit diagrams;

Figure 10: nine passage 80C31 real-time data acquisition circuit diagrams;

Figure 11: six passage 80C31 real-time data acquisition circuit diagrams;

Figure 12: triple channel 80C31 real-time data acquisition circuit diagram;

Figure 13: keyboard and display interface device circuit diagram;

Figure 14: electromagnetic relay control output interface circuit synoptic diagram;

Figure 15: solid-state relay control output interface circuit synoptic diagram;

Figure 16: power circuit synoptic diagram;

Figure 17: main program flow block scheme;

Figure 18: timing interruption subroutine block scheme;

Figure 19: keyboard interrupt subroutine block scheme.

Embodiment 1,2,3: three, six, nine channel switch formulas detection gamma-rays level-sensing device.Referring to Fig. 1 (b), Fig. 3,4,6,9,8,7,13,14,15,16,17,18,19, the installment state of gamma ray projector and detector, referring to Fig. 1 (b), among the figure, 3 is airtight container, 1 is detector, and three detectors are installed in this equipment, and promptly equipment needs three control points, also can increase the control point as required, when the radioactive source on the float and detector were on same horizontal line, the gamma intensity that this moment, detector received was the strongest, when float during away from detector, transmitted intensity more and more a little less than, judge that with this liquid height in container is the height that reaches a certain detector.This detection scheme can be used for the running status of water isolation pump in the ash disposal workshop of fuel-burning power plant, lay the γ radiation source at water isolation pump except that on the ball float of ash can, three positions install and fix three detectors in the tank body upper, middle and lower, and such one nine passage gamma-rays level-sensing device can detect three ruuning situations of removing ash can simultaneously.2 is gamma ray projector, be installed on the float in the airtight container, swim on the liquids charge level, 4 is detector, sodium iodide crystal and photomultiplier 5 and corresponding circuits are formed, referring to Fig. 3 or Fig. 4, photomultiplier 5 is selected GDB44 for use among the figure, and high direct voltage+HV is added in the GDB44 anode, its plus earth, when ray enters sodium iodide crystal, crystal produces fluorescence, and the negative electrode of photomultiplier is accepted to produce photoelectric effect after the irradiation of light, through the multiplication of each grid, from the negative spike pulse signal of anode output, pulse signal is through front end circuit BG301 and BG ₃₀₂After the amplification, form output signal DET _oAnd DETi, i=1～8 are to DET _oWith the pre-service that the DETi signal further amplifies, referring to Fig. 6, the DETi signal pre-processing circuit is Fig. 6 roughly the same, DET _oSignal adopts integrated operatinoal amplifier LM318 and comparer LM393 to carry out anti-phase ratio amplification and arrangement, the signal PRE of output pulse amplitude unanimity _oAnd PREi, as the input signal of real-time data acquisition circuit.

Adopt the main element of microprocessor as the real-time data acquisition circuit, see Fig. 9,8,7, present embodiment selects the AT89C51 single-chip microcomputer, be equipped with a slice or two or three 8253 programmable count chips, every 8253 contains 3 counters, and beginning or the termination constantly of the mode of operation of counter and counting can be set by program.The output of the comparer LM393 of each passage level-sensing device: PRE _o, the P of PREi and AT89C51 ₁₇Carry out after the inclusive-OR operation count signal as counter.T with AT89C51 ₁Be timer,, 8253 programmable counter chips once sampled, finish the collection of three, six, nine passage level-sensing device information, the P of microprocessor AT89C51 every certain cycle ₂₇, P ₂₆, P ₂₅After the 74LS138 decoder for decoding, produce 8 address signals, as 8253 or the address of other chip, frame of broken lines A partly detects electronic circuit for running state of programs, it can detect the ruuning situation of microprocessor, in case program is run fast, circuit provides control signal, frame of broken lines B partly is the control electronic circuit that resets, can power-on reset, and button resets, can receive simultaneously the control signal of running state of programs testing circuit, produce reset signal by force, make program roll back, improve the antijamming capability of circuit.About the concrete connection situation of each element of real-time data acquisition circuit with reference to figure 9,8,7 and the description of technical scheme counterpart, no longer heavily chat at this.

Keyboard and display interface device circuit are seen Figure 13, and data reservoir HK1225 chip, this chip are non-volatile SRAM, built-in lithium battery, and capacity is the 8K byte, the data of utilizing chip to solve easily to gather after the power down and the problem of losing of preset parameter.With the interface of programming device 8279 as keyboard and display, this chip can be to the display autoscan, can discern the key number of closed key on the keyboard, improve the efficient of microprocessor, frame of broken lines C is depicted as keyboard, and keyboard now defines 5 buttons, monitor key, acknowledgement key, number+1/-1 key, on/lower limit alert locations setting key.With one 8 bit parallel delivery outlet of 8D latch 74LS377 expansion, add a P again ₁₅Constitute 9 tunnel output control signals, be used for the material level off-limit alarm of No. 9 level-sensing devices, the connection concrete condition of each element in relevant keyboard and the display interface device circuit referring to the description of Figure 13 and technical scheme counterpart, no longer repeats.

The control output interface circuit is seen Figure 14 or 15, and this circuit is with the output of the 74LS377 in keyboard and display interface device circuit OUTPUT ₁～OUTPUT ₈P with microprocessor AT89C51 ₁₅, i.e. OUTPUT ₀As the input signal of this circuit, through impact damper 7407 buffering rear drive optocoupler 4n25s.Utilize the state of light emitting diode indication control output, with photoelectrical coupler output to triode driving array MC1413, succeed electrical equipment J again.A slice MC1413 contains No. 8 amplifiers.The signal of nine passages need increase a triode amplifier.MC1413 has stronger driving force, can directly drive electromagnetic relay.Electromagnetic relay provides the switch contact signal, can adapt to the needs of multiple peripherals.Electromagnetic relay also can be used solid-state relay instead, referring to Figure 15.

Power circuit is seen Figure 16, and this circuit is mainly photomultiplier or counter tube provides high direct voltage+HV and the required DC voltage+12V of each chip ,-12V ,+5V.

Data acquisition software, this software carries out modular design by the function piecemeal, mainly by master routine, all kinds of interrupt routines, data operation program, real-time acquisition program, subroutines such as control output are formed, and Figure 17 shows that the master routine block scheme, and master routine is mainly finished the initial work of each interface chip, each status word is set, the storehouse initial value pre-sets the alarming value of bound, and timer T is set ₁, regularly can establish 0.1 second, finish the initialization of 8279 keypad/display and 8253.

T shown in Figure 180 ₁The block scheme of interruption subroutine is mainly finished collection, computing, the output control of each passage material level data.Data acquisition is set to each second collection once, after setting-up time arrives, reads each counter data successively.After the data read, carry out filtering and digital operation respectively, subsequently according to the warning message that is provided with, judge to have or not out-of-limit situation to take place, if no out-of-limit, follow procedure shows every road material level information successively, and export for normal control, if out-of-limit generation is arranged, preferentially show out-of-limit signal message, give out-of-limit control signal simultaneously.

Figure 19 is a keyboard interrupt subroutine block scheme, mainly finish the preceding debugging work of the normal operation of instrument, accept input command and provide command interpretation, when button was pressed, 8279 sent interrupt request to AT89C51, AT89C51 at first reads key assignments, judge whether order is the effective order key, button must be a monitor key for the first time, otherwise, other key is pressed earlier, and is then invalid.After pressing monitor key, enter monitor state, show first via information, press+the 1/-1 key, can change monitor channel, when enter first/when lower limit was reported to the police and to be provided with, the alarming value that display routine presets was if will change alarming value, press+the 1/-1 key, after finishing new settings, press acknowledgement key, the notice microprocessor is accepted new setting value.

Embodiment 4,5, and 6; Three, six, nine channel switch formulas detect the gamma-rays level-sensing device.See Fig. 1 (a), 5,12,11,10,13,14 or Figure 15, Figure 16,17,18,19.Shown in Fig. 1 (a), be the scheme of installation of single channel single-point source switch formula gamma ray projector and detector.Radiographic source and detector are installed in respectively on the same surface level in both sides of watch-dog.Number in the figure does not repeat with embodiment 1.Detected medium can be a liquid, also solid, when medium was lower than the plane in the equipment, ray was not subjected to dielectric impedance, and detector is accepted transmitted intensity, when medium reaches or be higher than this surface level, medium absorbs ray, and detector is accepted a little less than the transmitted intensity, thus two kinds of information, can judge whether medium reaches this surface level, thus the control signal of providing.

Detector uses the counter tube among Fig. 5, and 6 is the G-M computer tube, can select J408 or J306 model for use, and its advantage is that cost is low, and is simple in structure, operating voltage lower (400V), and output signal is stronger, does not need secondary to amplify.Its shortcoming is that detection efficiency is lower, and the life-span is shorter.

The pulse signal of counter tube output is input to emitter follower BG501 and BG502 through coupling capacitance C501, enters comparer LM393 then, pulse by shaping after, directly form PREo, the PREi signal enters real-time Acquisition Circuit.

Figure 12,11,10 is three, six, nine passage real-time data acquisition circuit diagrams, this circuit diagram and embodiment 1,2,3 corresponding circuits Fig. 9,8,7 differences are that the microprocessor single-chip microcomputer adopts the 80C31 chip, since do not contain EPROM in 8031 chips, thus externally necessary established procedure storer 2764, as outside EPROM chip, all the other elements and method of attachment do not repeat with the corresponding circuits of embodiment 1.

Other circuit and software design do not repeat with embodiment 1.Present embodiment can be used for cement mill vertical kiln equipment monitoring, when cement clinker is carried inside and outside shaft kiln, detects simultaneously in 6 pipelines with this instrument whether cement clinker is arranged.

Embodiment 7,8, and 9: linear measurement three, six, nine passages intelligence gamma-rays level-sensing device, referring to Fig. 2 (a), 2 (b), 4,6,9,8,7,13,14,15,16,17,18,19, Fig. 4, Fig. 6, Fig. 9,8,7 form triple channel, six passages, three kinds of linear measurement level-sensing devices of nine passages, keyboard and display interface device are seen Figure 13, output circuit adopts Figure 14 or Figure 15.Fig. 2 (a), shown in 2 (b), be the linear measurement radioactive source, the detector configuration structural representation, each label represents meaning with embodiment 1, Fig. 2 (a) is the single-point source, the collocation form of simple detector, radioactive source and detector are installed in the equipment both sides respectively, its both vertical range has determined the detection range, and the medium in the equipment can be a liquid, also solid, when medium changed within range, the ray power that detector receives will change to some extent, can calculate the relative height of medium in the equipment thus, the cold friendship of chemical fertilizer factory, the ammonia branch, cuprammonium washing tower for removing CO is a high-tension apparatus, liquid level in the equipment can adopt this scheme to detect, and can detect multiple devices simultaneously with an instrument, provides liquid level in the individual device in real time.

If the measurement range that equipment requirements detects is bigger, then can adopt the mount scheme of the single-point source double detector of Fig. 2 (b), microcomputer software carries out overlap-add procedure to the signal of these two detectors.

Detector adopts photomultiplier, and negative high voltage is adopted in power supply, sees Fig. 4.

It is data processing section that linearity test software and switch are measured different, by formula (2) as can be known, the signal of detector is carried out the linear information that logarithm operation can provide measured medium, software be programmed in Figure 17, do corresponding change on 18,19 bases.

Relevant Fig. 6, in 9,8,7,13,14,15,16 each components and parts basically with embodiment 1,2,3 is identical, each components and parts connects as shown in the figure, also can describe referring to the technical scheme counterpart, does not repeat.

Claims (6)

1, a kind of intelligent hyperchannel gamma-rays level-sensing device, contain casing, gamma ray projector, detector, signal pre-processing circuit, the real-time data acquisition circuit, keyboard and display interface circuit, controlling output circuit, power circuit, feature of the present utility model is, the real-time data acquisition circuit, contain MCS-51 series or its clone as microprocessor, the programmable count chip, the latch chip, decoder chip, running state of programs detects electronic circuit, the control electronic circuit resets, the OPADD signal of microprocessor connects the data input pin of decoder chip, and code translator connects the address selection end of programmable counter chip respectively with the address signal that produces, and the OPADD signal of microprocessor connects the data input pin of latch chip, latch connects address signal at the address end of program counter, the data terminal of microprocessor, the read-write control end is connected with signal pre-processing circuit count pulse output terminal respectively, the output control signal of microprocessor connects running state of programs and detects the electronic circuit control end, detect the output control signal of electronic circuit, receive the control end of the control electronic circuit that resets, the control electronic circuit output reset signal that resets connects the reset terminal of microprocessor.

2, level-sensing device according to claim 1 is characterized in that, in the real-time data acquisition circuit, microprocessor MCS-51 device series clone can have 8751,8752,8032,87C51,80C31, AT89C51, the programmable counter chip can be 8253, and the latch chip can be 74LS373, decoder chip can be 74LS138, and chip 8253 can be with a slice or two, or three, every contains 3 counters, the output PRE of signal pre-processing circuit ₀～PRE ₈By or the P of door 74CS32 and AT89C51 or 8751 ₁₇Logical inverse carry out inclusive-OR operation, then as 8253 clock signal, with 8253 CLK ₀, CLK ₁, CLK ₂End connects, every 8253 GATE ₂Termination power Vcc, 8253 and AT89C51 or 8751 between, D ₀～D ₇End and P ₀₀～P ₀₇Join, both RD, WR end links to each other every 8253 A ₀, A ₁The Q of end and 74LS373 ₀, Q ₁Connect, from bottom to top 8253 CS end respectively with the Y of 74LS138 ₂, Y ₃, Y ₄Join the D of 74LS373 ₀～D ₇End and AT89C51 or 8751 P ₀₀～P ₀₇Connect, the LE end links to each other with the ALE/P end, AT89C51 or 8751 P ₂₅, P ₂₆, P ₂₇End respectively with the A of 74LS138, B, C holds connection, the E of 74LS138 ₃Termination power Vcc, frame of broken lines A are that running state of programs detects electronic circuit, and time base circuit piece NE555 produces the rectangular wave clock signal, and output pin Q is connected to the clock end CLK of binary counter 74LS93 ₀On, the MR of 74LS93 ₁End is by the P of electric capacity and AT89C51 or 8751 ₁₆End connects, and regularly 74LS93 is carried out clear operation, and frame of broken lines B is the control electronic circuit that resets, the Q of 74LS93 ₃With electric capacity keep apart by or the door 74LS32 carry out receiving on the reset terminal RESET of AT89C51 or 8751 after the computing.

3, level-sensing device according to claim 1 and 2, it is characterized in that keyboard and display interface circuit contain data storage HK1225, keyboard and display chip 8279, bidirectional bus transmitter/receiver 74LS245, code translator 74LS138, trigger 74LS377, frame of broken lines C is a keyboard, and charactron, between HK1225 and the AT89C51 or 8751, D ₀～D ₇The end respectively with P ₀₀～P ₀₇Connect A ₈～A ₁₂The end respectively with P ₂₀～P ₂₄Connect, the OE end is connected with the PSEN end by 74LS00, and the WE end links to each other the CS of HK1225 with the WR end ₂, CS ₁Meet the Y of Vcc and 74LS138 respectively ₀End links to each other, the A of HK1225 ₀～A ₇Respectively with the Q of 74LS373 ₀～Q ₇Connect 8279 DB ₀～DB ₇Respectively with the P of AT89C51 or 8751 ₀₀～P ₀₇Connect the Y of the 74LS138 of CS end and real-time data acquisition circuit ₅End connects, and RD, WR, CLK are connected the C of reset control circuit with RD, WR, the ALE/P end of AT89C51 or 8751 respectively _3-2Link to each other with 8279 reset terminal RESET, provide electrification reset or push-button reset signal for 8279.8279 IRQ end is by Sheffer stroke gate 74LS ₀₀The INT of back and AT89C51 or 8751 ₁Connect, for microprocessor provides look-at-me.8279 OUTB ₀～OUTB ₃And OUTA ₀～OUTA ₃Respectively with 74LS245U ₁₄B ₀～B ₃And B ₇-B ₄End connects, SL ₀～SL ₂Respectively with the A of 74LS138, B, C holds connection, RL ₀～RL ₂Link to each other 74LS245U with empty frame C keyboard ₁₄A ₀～A ₇The A that connects charactron respectively, B, C, D, E, F, G, H end, the Y of 74LS138 ₀～Y ₂Connect 74LS245U ₁₃B ₀～B ₂, the empty frame C of keyboard meets Y ₀, Y ₁, 74LS245U ₁₃A ₀～A ₃Connect the COM end of charactron respectively, output terminal OUTPUT ₀Meet the P of AT89C51 or 8751 ₁₅, OUTPUTi, i=1～8 meet the Q of 74LS377 respectively ₀～Q ₇, the CLK of 74LS377 meets the WR of AT89C51, and E meets the Y of 74LS138 ₁

4, level-sensing device according to claim 1 and 2, it is characterized in that, controlling output circuit, adopt electromagnetic relay J or solid-state relay TACO25D as the control output interface, output OUTPUTi with the 74LS377 in keyboard and the display circuit, i=1～2 or 1～5 or 1～8, computer processor AT89C51 or 8751 P ₁₅Output OUTPUT ₀As input signal, drive optocoupler 4n25 through impact damper 7407, utilize light emitting diode D ₁₄₀₁Or D ₁₄₀₂Indication control output state drives triode at last and drives array MC1413 or triode 9013, meets electromagnetic relay J or solid-state relay TACO25D again.

5, level-sensing device according to claim 1 and 2 is characterized in that, power circuit is through transformer, rectifier bridge T ₁, T ₂, T ₃, T ₄, integrated package of pressure-stabilizing MC7812, MC7805, MC7912 provides+12V ,+5V, the DC voltage of-12V, the output voltage of change integrated package of pressure-stabilizing LM317 is through triode BG ₁₆₀₁, transformer TR ₁₆₀₁, coil L ₁₆₀₁After, for detector provides high-voltage dc voltage+HV.

6, level-sensing device according to claim 1 and 2 is characterized in that, signal pre-processing circuit, and detector adopts sodium iodide crystal and photomultiplier GDB44, and electric pulse is through circuit BG ₃₀₁After the BG302 amplification, output DET _oSignal, again through the main amplifying circuit integrated transporting discharging, LM318 carries out anti-phase ratio and amplifies, and exports PRE at last through comparer LM393 again _oSignal, PRE _o8253 CLK in 74HC32 input real-time data acquisition circuit ₀

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