CN201233446Y - Arbitrary nuclear power spectrum generator - Google Patents

Abstract

The utility model discloses an arbitrary nuclear spectrum generator, which mainly comprises a micro-control unit, a waveform processing unit, an oscillator, an amplitude stabilizing circuit and a program-controlled attenuation circuit, wherein one end of the micro-control unit is connected with a keyboard for inputting various parameters, while the other end is connected into the amplitude stabilizing circuit by the waveform processing unit; and the amplitude stabilizing circuit is connected with the program-controlled attenuation circuit for carrying out the attenuation of voltage. The arbitrary nuclear spectrum generator not only has the functions of a nuclear signal generator, but also has the inversion function of spectral line.

Description

Any nuclear spectrum generator

Technical field

The utility model relates to a kind of any nuclear spectrum generator.

Background technology

Present nuclear signal generator mainly contain two kinds a kind of be the slippage signal generator, promptly continuously export a series of amplitudes size continually varying pulse signals according to the rule of slippage; A kind of is that random signal generator is promptly exported the pulse signal that a series of amplitude size meets Gauss normal distribution according to normal distyribution function at random.This two kinds of nuclear signal generators or can only be used for proofreading and correct the prime amplifier of energy spectrometer inside, the enlargement factor of linear amplifier, can only observe the spectral line that a certain energy-ray forms qualitatively, all be to produce the nuclear pulse signal qualitatively after all, rather than quantitatively pulse signal is examined in generation, therefore these nuclear pulse signals can not form well-determined spectral line after being received by energy spectrometer, and whole function is all very single, and application surface is narrower.

Summary of the invention

For solving above-mentioned middle problem and the defective that exists, the utility model provides a kind of any nuclear spectrum generator.

The utility model is achieved through the following technical solutions:

A kind of any nuclear spectrum generator that the utility model is related can be edited the nuclear spectrum curve arbitrarily, and spectrum curve is converted to corresponding nuclear pulse signal output; Described generator mainly comprises: miniature control module, waveform processing circuit unit, oscillator, stablize magnitude circuit and program control attenuator circuit, wherein, one end of miniature control module links to each other with the keyboard of input parameters, the other end is connected to one by the waveform processing circuit unit to be stablized in the magnitude circuit, and described stable magnitude circuit links to each other with the program control attenuator circuit that voltage is decayed.Described any nuclear spectrum generator comprises that also one produces sinusoidal wave oscillator.

Described waveform processing circuit unit also comprises: by an analog switch of miniature control module control; The impact damper that sine wave is cushioned; Produce two comparers of pulse; Produce the trigger of a control analog switch signal and Be Controlled analog switch output waveform according to pulse; Analog switch and a phase inverter and a follower of the output of miniature control module control positive negative pulse stuffing.Described program control attenuator circuit comprises that also paired pulses carries out the even numbers weighted-voltage D/A converter and the operational amplifier of amplitude control, one of them digital to analog converter is connected in another digital to analog converter by operational amplifier, constitutes numerically controlled input resistance and numerically controlled feedback resistance respectively.One automatic gain control circuit carries out stable to wave-shape amplitude, make the amplitude output signal unanimity.

The beneficial effect of the technical scheme that the utility model provides is:

The spectral line that needs of compiles user arbitrarily, according to this spectral line, unique a series of particular core pulse signals of output in a period of time, after energy spectrometer receives this a series of nuclear pulse signal, form unique spectrum curve, the user can compare energy spectrometer and receive spectral line and the initial self-defining spectral line of user that nuclear produces behind the pulse signal, and the spectrum of judging energy spectrometer is in view of the above floated and information such as energy linearity degree.The user can also carry out the spectral line parsing afterwards, the constituent content component that the analysis result that obtains after the parsing is corresponding with original initial spectral line compares, can judge that according to the difference of the two spectral line resolves the good and bad degree of software, quantitatively obtain the accuracy that spectral line is resolved simultaneously.

Description of drawings

Fig. 1 is the structural representation of any nuclear spectrum generator;

Fig. 2 is a waveform processing element circuit structural representation;

Fig. 3 is the analog switch output waveform figure;

Fig. 4 stablizes magnitude circuit fixed ampllitude principle assumption diagram;

Fig. 5 is program control attenuator circuit principle assumption diagram.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, the utility model embodiment is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, the one-piece construction of showing any nuclear spectrum generator, the core of this structure are MCU (Micro Controller Unit, miniature control module) 10, and MCU10 gathers the parameters of keyboard 11 and main frame 18 inputs, and is shown by display end 19; Because the peak of the power spectrum of an independent element can be described with a Gaussian function, promptly count the relation that x is counted in y (x) and road: y (x)=y0e in each road in peak district ^{-(x-x0) (2)/2 σ (2)}, x0 is a peak center road number in the formula, and y0 represents peak center road counting, i.e. y0=y (x0). and σ is a parameter (root-mean-square deviation) of describing peak distribution width, and it with the pass of half height (FWHM) is: $\mathrm{FWHM}=2\sqrt{2\ln 2\mathrm{\σ}}=2.36\mathrm{\σ},$ According to the energy of every kind of element correspondence of keyboard input, the halfwidth at spectrum peak, gross energy road number, the scale factor of energy and pulse height, parameters such as maximum technology rate can obtain the Gaussian Energy spectral line of every kind of element afterwards, carry out the stack of all elements spectral line at last.The user can also represent the polynomial expression of background curve by the keyboard input simultaneously, and perhaps user-defined influence factor curve polynomial expression obtains complete spectral line at last.

Since examine the insufficient amplitude of the sine wave that BZ oscillator 12 produces stable with and the amplitude of the waveform paired pulses of waveform processing circuit 13 after handling influential, must use and stablize magnitude circuit 14 and carry out fixed ampllitude; By program control attenuator circuit a15 voltage is carried out primary attenuation then, what the decay output valve mainly was set by the user can road total voltage decision.Program control attenuator circuit b16 mainly decays accurately to the voltage of attenuator 1 output; At last with signal output apparatus 17.

After producing spectral line, next be exactly the hardware circuit scanning output of carrying out spectral line.Spectral line from the low energy domain scanning to the high energy district, scan n road (the ceiling capacity road number that n selects for the user) from zero track successively, when also having the counting of not output on this location, road, then to export specific amplitude pulse signal that should the location, road, multiple scanning is till the counting on all locations, road all is zero.Be exactly the generation and the output of the pulse signal of location, corresponding particular energy road then.

As shown in Figure 2, structure for the waveform processing element circuit, to come from and examine the 1Mhz of oscillator now, amplitude is that the processing that 2 volts high frequency oscillation signal carries out waveform is exported its waveform more near the nuclear instrument prime amplifier, produce square wave simultaneously for the MCU10 numeration, with the pulse number of control output.After the user determines to begin to export pulse, controlling first analog switch 20 by MCU10 opens, sine wave is admitted in the impact damper 21 and cushions and export, wherein, comparer a22 and reference voltage V REF24 are relatively, comparer b23 was zero balancing, and the pulse of two comparer generations makes d type flip flop 25 produce the signal of a control analog switch 26 and the output waveform of controlled analog switch 27, and this waveform is outputed in phase inverter 28 and the follower 29.As shown in Figure 3, the signal of control analog switch is 31,32 to be the analog switch output waveform; The preposition amplification of described waveform approximate kernel instrument back output signal, because the user can set positive negative pulse stuffing output, so next analog switch carries out positive negative pulse stuffing output selection by MCU.

As shown in Figure 4, be the fixed ampllitude principle assumption diagram, what adopt in the stable magnitude circuit of band AGC is that program control integrated operational amplifier (AD603) 40 carries out fixed ampllitude, described AGC (Automatic Gain Control, automatic gain control) circuit, adjust enlargement factor according to input signal, make the output signal unanimity, and the integrated transporting discharging that the AD603 that adopts is a low noise in this circuit, the 90MHz bandwidth gain is adjustable, as gain and represent with decibel, then gain is linear with control voltage, and slew rate is 275V/ μ s.Connected mode between pin has determined programmable gain margin, gain-11～+ bandwidth during 30dB is 90MHz, gain+9～+ have the 9MHz bandwidth during 41dB, change the connection resistance between pin, gain is in the above-mentioned scope.Because AD603 is a voltage control Amplifier, thus adopt Voltage Feedback 42 can stablize output to the signal output 41 of AD603, for the ease of the processing of next stage attenuator circuit, can be by regulating, it is 20V that the output of AD603 is adjusted to peak value.

As shown in Figure 5, be the structure of program control attenuator circuit principle, program control attenuator circuit a carries out primary attenuation to the 20V voltage that front AD603 exports, and what the decay output valve mainly was set by the user can road total voltage decision.Program control attenuator circuit a mainly decays accurately to the voltage of attenuator output.Described program control attenuator circuit is by two 12 DAC (Digital-to-Analog Converter, digital to analog converter) and the operational amplifier 55 of a wideband low noise form, what digital to analog converter was selected for use is current-output type, utilize its inner resistor network, the numerically controlled input resistance of digital to analog converter a51 structure, digital to analog converter b54 constitutes numerically controlled feedback resistance, its equivalent resistance is R (dac1)=2048*R (ld1)/NA, R (dac2)=2048*R (ld2)/NB, R in the formula (ld1), R (ld2) is respectively digital to analog converter! The R-2R trapezoidal network resistance of digital to analog converter b54.NA and NB are respectively the digital quantity a52 and the digital quantity b53 of weighted-voltage D/A converter a51 and digital to analog converter b54 input, because digital to analog converter a51 is identical with digital to analog converter b54, so R (ld1)=R (ld2), the full gain of entire circuit output is Vout/Vin=-NA/NB, NB is set to the energy road number that the user selects in the reality, and maximal value is 2048 roads, and NA is the control that increases progressively of energy road voltage, signal output apparatus mainly carries out impedance variation, has satisfied the needs of late-class circuit.

Present embodiment has not only possessed beyond the function of traditional nuclear signal generator, the inverting function that has also possessed spectral line, parameter according to user's input generates particular spectral lines, thereby can be to the prime amplifier of energy spectrometer, linear amplifier is calibrated, can also know accurately that the spectrum of energy spectrometer floats the accuracy of energy linearity degree and spectrum unscrambling software.Can also in the middle of the teaching of nuclear electronics, avoid the use of radioactive source at last, make the student experience the formation of whole spectral line, the interpretation process of spectral line more intuitively.

The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (5)

1, any nuclear spectrum generator, can edit the nuclear spectrum curve arbitrarily, and spectrum curve is converted to corresponding nuclear pulse signal output, it is characterized in that, described generator mainly comprises: miniature control module, waveform processing circuit unit, oscillator, stablize magnitude circuit and program control attenuator circuit, wherein, one end of miniature control module links to each other with the keyboard of input parameters, the other end is connected to one by the waveform processing circuit unit to be stablized in the magnitude circuit, and described stable magnitude circuit links to each other with the program control attenuator circuit that voltage is decayed.

2, any nuclear spectrum generator according to claim 1 is characterized in that, described any nuclear spectrum generator comprises that also one produces sinusoidal wave oscillator.

3, any nuclear spectrum generator according to claim 1 is characterized in that, described waveform processing circuit unit also comprises: by an analog switch of miniature control module control; The impact damper that sine wave is cushioned; Produce two comparers of pulse; Produce the trigger of a control analog switch signal and Be Controlled analog switch output waveform according to pulse; One analog switch and a phase inverter and a follower of the output of miniature control module control positive negative pulse stuffing.

4, any nuclear spectrum generator according to claim 1, it is characterized in that, described program control attenuator circuit comprises that also paired pulses carries out the even numbers weighted-voltage D/A converter and the operational amplifier of amplitude control, one of them digital to analog converter is connected in another digital to analog converter by operational amplifier, constitutes numerically controlled input resistance and numerically controlled feedback resistance respectively.

5, any nuclear spectrum generator according to claim 1 is characterized in that, described any nuclear spectrum generator also comprises wave-shape amplitude is carried out a stable automatic gain control circuit, makes the amplitude output signal unanimity.

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