CN207380256U - Voltage frequency conversioning circuit and Environmental dose rate instrument - Google Patents
Voltage frequency conversioning circuit and Environmental dose rate instrument Download PDFInfo
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- CN207380256U CN207380256U CN201721540492.9U CN201721540492U CN207380256U CN 207380256 U CN207380256 U CN 207380256U CN 201721540492 U CN201721540492 U CN 201721540492U CN 207380256 U CN207380256 U CN 207380256U
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Abstract
The utility model provides a kind of voltage frequency conversioning circuit and Environmental dose rate instrument, which includes：First integral amplification module connected in sequence, second integral amplification module, comparator and trigger；First integral amplification module obtains first voltage signal for carrying out integration amplification to the electric quantity signal of input；Second integral amplification module obtains pulse broadening, the second voltage signal of amplitude amplification for carrying out integration amplification to first voltage signal；Comparator is used for the activation threshold value for comparing second voltage signal and setting, and when second voltage signal is more than activation threshold value, enable signal is exported to trigger；Trigger is according to the enable signal of reception, output frequency clock pulses corresponding with electric quantity signal.Due to eliminating the circuit modules such as peak holding and constant-current discharge, the structure of the voltage frequency conversioning circuit and Environmental dose rate instrument is simple, reduces power consumption and cost, reduces volume, and user is facilitated to carry.
Description
Technical field
The utility model is related to radiation detection technology field, more particularly, to a kind of voltage frequency conversioning circuit and environment agent
Dose rate instrument.
Background technology
, it is necessary to know damage effect of the radiating particle to human body in ionizing radiation measurement, and for ionising radiation,
Its energy is higher, generally bigger to human injury, so the record of radiation energy is particularly important.
Generally use dose equivalent rate come characterize unit interval internal ionization radiation caused by biological effect serious journey
Degree, wherein, dose equivalent refers to absorbed dose of radiation, quality factor and all other modifying factors in the tissue to be studied at certain point
Several products, dose equivalent rate are that dosage works as the increment put in the unit interval.At present in the dose equivalent rate to ionising radiation
In measurement, general using spectrometer, either ionisation chamber carries out the energy of particle either nucleic screens spectrometer or ionisation chamber is used
Voltage frequency conversioning circuit generally comprise：The circuit modules such as multistage amplification, peak holding and constant-current discharge, measurement accuracy ratio
Higher, general opposite constant error can be within 5%.
It is larger yet with the quiescent current needed for the circuit modules such as peak holding and constant-current discharge, electric voltage frequency is caused to turn
It is higher to change circuit power consumption.In addition, it is measured for general environmental dose equivalent rates under occasion, existing voltage frequency conversioning circuit
It is complicated, cause that cost is higher, volume is larger, user's use is relatively inconvenient.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of voltage frequency conversioning circuit and Environmental dose rate instrument,
To reduce power consumption, simplify structure, so as to reduce cost, reduce volume, user is facilitated to carry.
In a first aspect, the utility model embodiment provides a kind of voltage frequency conversioning circuit, including：Connected in sequence
One integration amplification module, second integral amplification module, comparator and trigger；
The first integral amplification module obtains first voltage letter for carrying out integration amplification to the electric quantity signal of input
Number；The second integral amplification module obtains pulse broadening, amplitude is put for carrying out integration amplification to the first voltage signal
Big second voltage signal；The comparator is for the second voltage signal and the activation threshold value of setting, when described the
When two voltage signals are more than the activation threshold value, enable signal is exported to the trigger；The trigger is according to the institute of reception
State enable signal, output frequency clock pulses corresponding with the electric quantity signal.
With reference to first aspect, the utility model embodiment provides the first possible embodiment of first aspect,
In, the first integral amplification module includes the first operational amplifier, the first capacitance and first resistor；
The input terminal of first operational amplifier for receiving the electric quantity signal, first operational amplifier it is defeated
Outlet is connected with the second integral amplification module；One end of first capacitance and the input terminal of first operational amplifier
Connection, the other end of first capacitance are connected with the output terminal of first operational amplifier；The first resistor is connected in parallel on
On first capacitance.
The possible embodiment of with reference to first aspect the first, the utility model embodiment provide the of first aspect
Two kinds of possible embodiments, wherein, the second integral amplification module includes second operational amplifier, the second capacitance and second
Resistance；
The input terminal of the second operational amplifier is connected with the output terminal of first operational amplifier, second fortune
The output terminal for calculating amplifier is connected with the comparator；One end of second capacitance and the input of the second operational amplifier
End connection, the other end of second capacitance are connected with the output terminal of the second operational amplifier；The second resistance is in parallel
On second capacitance.
Second of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Three kinds of possible embodiments, wherein, the time constant of the first integral amplification module is more than the second integral and amplifies mould
The time constant of block；The capacity of first capacitance is less than the capacity of second capacitance, and the resistance value of the first resistor is more than
The resistance value of the second resistance.
Second of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Four kinds of possible embodiments, wherein, it is first operational amplifier, the second operational amplifier, the comparator, described
Trigger is complementary metal oxide semiconductor cmos device.
The 4th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Five kinds of possible embodiments, wherein, first operational amplifier includes AD8622 chips, the second operational amplifier bag
Include SGM321 chips.
With reference to first aspect, the utility model embodiment provides the 6th kind of possible embodiment of first aspect,
In, the comparator includes TLV3201 chips, and the trigger includes CD4011 chips.
Second aspect, the utility model embodiment also provide a kind of Environmental dose rate instrument, including such as above-mentioned first aspect and
Voltage frequency conversioning circuit described in its any possible embodiment, further includes radiation detector and microcontroller；
The radiation detector is connected with the first integral amplification module of the voltage frequency conversioning circuit, for detecting spoke
The electric quantity signal of radion, and export the electric quantity signal to the voltage frequency conversioning circuit；The voltage to frequency convert electricity
Road is also connected with the microcontroller, corresponding with the electric quantity signal to the microcontroller output frequency for passing through the trigger
Clock pulses；Count value is converted to the radiation grain by the microcontroller for being counted to the clock pulses
The particle energy of son.
With reference to second aspect, the utility model embodiment provides the first possible embodiment of second aspect,
In, the radiation detector includes semiconductor detector or gas ionization detector.
With reference to second aspect, the utility model embodiment provides second of possible embodiment of second aspect,
In, the Environmental dose rate instrument further includes display screen, and the display screen is connected with the microcontroller；
The microcontroller is additionally operable to export the particle energy to the display screen, and the display screen is used to show the grain
Sub- energy.
The utility model embodiment brings following advantageous effect：
In the utility model embodiment, voltage frequency conversioning circuit includes：First integral amplification module connected in sequence,
Two integration amplification modules, comparator and trigger；First integral amplification module is used to that the electric quantity signal of input integrate to put
Greatly, first voltage signal is obtained；Second integral amplification module obtains pulse exhibition for carrying out integration amplification to first voltage signal
Wide, amplitude amplification second voltage signal；Comparator is used for the activation threshold value for comparing second voltage signal and setting, when the second electricity
When pressing signal more than activation threshold value, enable signal is exported to trigger；Trigger according to the enable signal of reception, output frequency with
The corresponding clock pulses of electric quantity signal.Due to eliminating the circuit modules such as peak holding and constant-current discharge, the voltage to frequency convert
Circuit and Environmental dose rate instrument implement more simple, reduce power consumption and cost, reduce volume, user is facilitated to carry.
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent or understood by implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is realized and obtained in book, claims and attached drawing.
For the above-mentioned purpose of the utility model, feature and advantage is enable to be clearer and more comprehensible, preferred embodiment cited below particularly, and
Attached drawing appended by cooperation, is described in detail below.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution of the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it describes below
In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is the structure diagram for the voltage frequency conversioning circuit that the utility model embodiment provides；
Fig. 2 is the circuit diagram for the voltage frequency conversioning circuit that the utility model embodiment provides；
Fig. 3 is the schematic diagram that the second voltage signal that the utility model embodiment provides changes over time；
Fig. 4 is the structure diagram for the Environmental dose rate instrument that the utility model embodiment provides.
Icon：
101- first integral amplification modules；102- second integral amplification modules；103- comparators；104- triggers；301-
Voltage frequency conversioning circuit；302- radiation detectors；303- microcontrollers.
Specific embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model part is real
Example is applied, instead of all the embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making
All other embodiments obtained under the premise of creative work, shall fall within the protection scope of the present invention.
In present applications ' the tail must be taken, generally using spectrometer, either ionisation chamber carries out the energy of particle or nucleic is screened, so as to
Dose equivalent rate is measured, measurement accuracy is higher, and general opposite constant error can be within 5%, but its cost is expensive, volume
Greatly, power consumption is high, for using inconvenience relatively under generally such as environmental dose equivalent rates measurement occasion.In view of for general ring
Border dose equivalent rate measurement accuracy requirement is not very high, with respect to constant error within 20%, so the utility model is real
It applies example and provides a kind of voltage frequency conversioning circuit and Environmental dose rate instrument, there is suitable, easy to carry, low in energy consumption excellent of cost
Point can save about an order of magnitude, battery life compared with current general VF (voltage conversion frequency) conversion chips power consumption
It is long.
For ease of understanding the present embodiment, a kind of electric voltage frequency disclosed in the utility model embodiment is turned first
Circuit is changed to describe in detail.
Embodiment one：
Voltage frequency conversioning circuit provided in this embodiment can be applied in Environmental dose rate instrument, it is contemplated that environmental dose
The similar impulse function of nuclear radiation pulse signal (electric quantity signal) of the radiation detector output of rate instrument, rising edge and trailing edge are all
Compare steep, when recognition time information is relatively difficult, so first considering pulse broadening.Using two-integrator to electricity in the present embodiment
Signal is into line broadening, then triggering is compared to broadened signal, finally output and the relevant frequency signal of electric quantity signal amplitude.
Fig. 1 is the structure diagram for the voltage frequency conversioning circuit that the utility model embodiment provides, as shown in Figure 1, should
Voltage frequency conversioning circuit includes：First integral amplification module 101 connected in sequence, second integral amplification module 102, comparator
103 and trigger 104；First integral amplification module 101 obtains the first electricity for carrying out integration amplification to the electric quantity signal of input
Press signal；Second integral amplification module 102 obtains pulse broadening, amplitude is put for carrying out integration amplification to first voltage signal
Big second voltage signal；Comparator 103 is used for the activation threshold value for comparing second voltage signal and setting, when second voltage signal
During more than activation threshold value, enable signal is exported to trigger 104；Trigger 104 according to the enable signal of reception, output frequency with
The corresponding clock pulses of electric quantity signal.Wherein, activation threshold value can be set according to actual demand, be, for example, 0.04V or 0.1V
Deng being not construed as limiting here.
Specifically, the radiation detector of Environmental dose rate instrument is in detection after radiating particle, according to the radiation detector
Mean ionization energy can generate the electric quantity signal directly proportional to the particle energy of radiating particle (such as gamma-rays/γ particles), and defeated
Go out into voltage frequency conversioning circuit provided in this embodiment.This electric quantity signal is approximately impulse function, is put by first integral
Become first voltage signal after the big integration of module 101 amplification, become to have after using the integration of second integral amplification module 102 amplifying
The second voltage signal of one fixed width (pulse width) and amplitude, (high level state) exports after comparator 103 is compared
Enable signal, enable signal startup trigger 104 export continuous clock pulse.The number of the clock pulses of output in unit interval
(umber of pulse) is pulse frequency, since umber of pulse is corresponding with the crest voltage of second voltage signal, and second voltage signal
It is corresponding with electric quantity signal, electric quantity signal is directly proportional to particle energy namely second voltage signal and particle energy it is corresponding, therefore touch
It sends out the continuous clock pulse that device 104 exports and passes through data convert, you can accurately reflect the energy of incoming particle (radiating particle)
Information (particle energy).
Above-mentioned voltage frequency conversioning circuit is simply easily achieved.Compared with other same type circuits or external special VF
The conversion circuit of the modules compositions such as conversion chip or multistage amplification, peak holding and constant-current discharge, the present embodiment use device
Part is universal component, and eliminates the partial circuits module such as peak holding and constant-current discharge so that the circuit implements more
Simply, and power consumption is reduced.
In the utility model embodiment, voltage frequency conversioning circuit includes：First integral amplification module connected in sequence,
Two integration amplification modules, comparator and trigger；First integral amplification module is used to that the electric quantity signal of input integrate to put
Greatly, first voltage signal is obtained；Second integral amplification module obtains pulse exhibition for carrying out integration amplification to first voltage signal
Wide, amplitude amplification second voltage signal；Comparator is used for the activation threshold value for comparing second voltage signal and setting, when the second electricity
When pressing signal more than activation threshold value, enable signal is exported to trigger；Trigger according to the enable signal of reception, output frequency with
The corresponding clock pulses of electric quantity signal.Due to eliminating the circuit modules such as peak holding and constant-current discharge, the voltage to frequency convert
Circuit implements more simple, reduces power consumption and cost, reduces volume, user is facilitated to carry.
In some possible embodiments, first integral amplification module 101 include the first operational amplifier, the first capacitance and
First resistor.The input terminal of first operational amplifier for receiving above-mentioned electric quantity signal, the output terminal of the first operational amplifier with
Second integral amplification module 102 connects；One end of first capacitance is connected with the input terminal of the first operational amplifier, the first capacitance
The other end is connected with the output terminal of the first operational amplifier；First resistor is connected in parallel on the first capacitance.Second integral amplification module
102 include second operational amplifier, the second capacitance and second resistance.The input terminal of second operational amplifier and the first operation amplifier
The output terminal of device is connected by interlaminated resistance, and the output terminal of second operational amplifier is connected with comparator 103；The one of second capacitance
End is connected with the input terminal of second operational amplifier, and the other end of the second capacitance and the output terminal of second operational amplifier connect；
Second resistance is connected in parallel on the second capacitance.Further, reverse phase amplification may be employed in the first operational amplifier, can also use same
Mutually amplify, reverse phase amplification may be employed in second operational amplifier, can also use with mutually amplifying, is not construed as limiting here.
In order to further reduce power consumption, the first operational amplifier, second operational amplifier, comparator 103, trigger 104
It is complementary metal oxide semiconductor CMOS (Complementary Metal Oxide Semiconductor) device.On
It is cmos device to state the active devices such as the simulation in circuit and logic, and combined circuit quiescent point is set, compared with other
Same type circuit or chip significantly reduce power consumption, and the operating current of actual measurement is only 200 μ A/3.3V, and foreign same type is special
3mA/5V is up to the operating current of chip (such as LM331).
The present embodiment additionally provides a kind of circuit diagram of voltage frequency conversioning circuit, referring to Fig. 2, wherein, A1 represents first
Operational amplifier, C1 represent the first capacitance, and R1 represents first resistor, and Rm represents interlaminated resistance, and A2 represents second operational amplifier,
C2 represents the second capacitance, and R2 represents second resistance, and CMP represents comparator 103, and G represents trigger 104.Specifically, such as Fig. 2 institutes
Show, A1, A2 are amplified using reverse phase, input terminal of the end of oppisite phase as signal；The in-phase end of A1, A2 pass through resistance (500 Ω
(ohm) is herein citing, specific resistance value is not construed as limiting here) ground connection.
Exemplified by commonly using gamma-rays/γ particles of the low energy 59.6keV high energy 1.3MeV in ionizing radiation measurement, above-mentioned electricity
The transmission function on road is：
Wherein, Q is the relevant quantity of electric charge of particle energy with incoming particle (γ particles), and s is transmission function operator.
When choosing the value of each component, it is contemplated that first integral amplification module 101 and second integral amplification module 102
What is handled respectively is electric quantity signal and voltage signal (second voltage signal), and since the hangover of electric quantity signal is very long, electricity is believed
Number processing time longer closer true energy, therefore the time constant of first integral amplification module 101 be more than second integral
The time constant of amplification module 102, i.e. R1C1 are more than (or even much larger than) R2C2.For the electric quantity signal that is made of charge Lai
It says, C1 is the smaller the better, and R1 is the bigger the better, but post-processing is inconvenient when R1 is too big；At the integration amplification of voltage signal
Reason will ensure that signal frequency is fully amplified, and general signal frequency is in tens to hundreds of Hz, usually by the average frequency of voltage signal
The break frequency of integration amplification, such as 100Hz are arranged to, according to the value of break frequency comprehensive selection R2, C2.It is asked in view of above-mentioned
Topic, the capacity of the first capacitance should be less than the capacity of the second capacitance, and the resistance value of first resistor should be greater than the resistance value of second resistance.
In some embodiments, the value of above-mentioned each component can be chosen for：C1=0.5pF, R1=100M Ω, Rm=
500 Ω, C2=100pF, the activation threshold value of R2=47k Ω, CMP are 0.04V, and the G output signal periods are that 10 μ s, A1 gains are about
140mV/MeV, A2 passband gain are about 100.
For the parts selection of A1, A2, CMP and G, low in energy consumption, small, general easy purchase is mainly considered.Specifically, A1
(the first operational amplifier) main function is that the electric quantity signal formed to the charge that radiation detector generates carries out integration amplification,
Seek A1：Output noise is small, bias current is small, input impedance is big, quiescent current is small, but due to being integrated to charge, the time
The gain of longer acquisition is bigger, so not high to the bandwidth requirement of A1.In some embodiments, A1 selects AD8622 chips,
Input bias current is 20pA, and input impedance is 1G Ω (anti-phase input impedance) and 1T Ω (homophase input impedance), output noise
ForStatic working current is 175 μ A.
A2 (second operational amplifier) main function is voltage amplification, it is desirable that quiescent current is small, with it is roomy, noise is small.
In some embodiments, A2 selection SGM321 chips, 80 μ A of quiescent current, bandwidth 1MHz, bandwidth is the two of A1 (AD8622 chips)
Times, output noise is
CMP (comparator 103) major requirements speed is fast, delay is small, biased electrical is forced down.In some embodiments, CMP is selected
TLV3201 chips, up and down and time delay about 40ns, bias voltage 1mV or so.
In some embodiments, G (trigger 104) can select two input terminals, the CD4011 chips (CMOS of four NAND gates
Chip) composition trigger circuit, operating current is small, speed is fast, export clock cycle most I sets to 1 μ s.
On the basis of above-mentioned parts selection, if the γ particle energies of 59.6keV and 1.3MeV are all deposited on radiation and visit
It surveys in device, then two second voltage signal such as Fig. 3 that the two electric quantity signals generate after two-stage is amplified and is integrated at A2 ends
It is shown, wherein, abscissa represents time, unit 10-4Second (s), ordinate represent the amplitude of second voltage signal, and unit is volt
Special (V), the γ particles of the corresponding 59.6keV of the smaller signal of amplitude (compared with small-signal), the larger signal of amplitude (larger signal) are right
Answer the γ particles of 1.3MeV.It is 0.03ms compared with duration of the small-signal on 0.04V by calculating, larger signal exists
Duration on 0.04V is about 0.19ms, then it is respectively 3 and 19 continuous clock pulse to be exported after G is triggered, this
Pulse can accurately reflect the energy information (particle energy) of incoming particle (radiating particle) by data convert.
Embodiment two：
Fig. 4 is the structure diagram for the Environmental dose rate instrument that the utility model embodiment provides, as shown in figure 4, the environment
Dose rate instrument includes the voltage frequency conversioning circuit 301 such as above-described embodiment one, further includes radiation detector 302 and microcontroller
303；Radiation detector 302 is connected with the first integral amplification module 101 of voltage frequency conversioning circuit 301, is radiated for detecting
The electric quantity signal of particle, and export the electric quantity signal to voltage frequency conversioning circuit 301；Voltage frequency conversioning circuit 301 also with
Microcontroller 303 connects, for passing through trigger 104 to 303 output frequency of microcontroller clock pulses corresponding with electric quantity signal；It is single
Count value is converted to the particle energy of radiating particle by piece machine 303 for being counted to the clock pulses.
Specifically, radiation detector 302 includes semiconductor detector or gas ionization detector.303 memory storage of microcontroller
There is the transformational relation of default count value and particle energy, count value can be converted to according to the transformational relation by radiation grain
The particle energy of son.
In the utility model embodiment, voltage frequency conversioning circuit includes：First integral amplification module connected in sequence,
Two integration amplification modules, comparator and trigger；First integral amplification module is used to that the electric quantity signal of input integrate to put
Greatly, first voltage signal is obtained；Second integral amplification module obtains pulse exhibition for carrying out integration amplification to first voltage signal
Wide, amplitude amplification second voltage signal；Comparator is used for the activation threshold value for comparing second voltage signal and setting, when the second electricity
When pressing signal more than activation threshold value, enable signal is exported to trigger；Trigger according to the enable signal of reception, output frequency with
The corresponding clock pulses of electric quantity signal.Due to eliminating the circuit modules such as peak holding and constant-current discharge, turn including electric voltage frequency
The Environmental dose rate instrument for changing circuit implements more simple, reduces power consumption and cost, reduces volume, user is facilitated to take
Band.
Further, the measurement result of Environmental dose rate instrument is checked in order to facilitate user, which further includes
Display screen, display screen are connected with microcontroller 303；Microcontroller 303 is additionally operable to the particle energy being converted to display screen output, shows
Display screen is used to show the particle energy.
The Environmental dose rate instrument that the utility model embodiment provides, the voltage frequency conversioning circuit provided with above-described embodiment
With identical technical characteristic, so can also solve the technical issues of identical, reach identical technique effect.
It is apparent to those skilled in the art that for convenience and simplicity of description, the environment of foregoing description
The specific work process of dose rate instrument may be referred to the corresponding process in aforesaid voltage freq converting circuit embodiment, herein not
It repeats again.
In addition, in the description of the utility model embodiment, unless otherwise clearly defined and limited, term " connected ",
" connection " should be interpreted broadly, for example, it may be being connected directly, can also be indirectly connected by intermediary, can be two
Connection inside element.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood in this practicality
Concrete meaning in new.
Block diagram in attached drawing shows the architectural framework in the cards of multiple embodiments according to the present utility model.At this
On point, each box in block diagram can represent a part for a module, program segment or code, the module, program segment or
A part for code includes the executable instruction that one or more is used to implement defined logic function.It should also be noted that having
It is a little to be occurred as the function of in the realization replaced, being marked in box with being different from the order marked in attached drawing.Example
Such as, two continuous boxes can essentially perform substantially in parallel, they can also be performed in the opposite order sometimes, this according to
Depending on involved function.It is also noted that the combination of each box in block diagram and the box in block diagram, Ke Yiyong
Function as defined in execution or the dedicated hardware based system of action are realized or can referred to specialized hardware and computer
The combination of order is realized.
In several embodiments provided herein, it should be understood that disclosed voltage frequency conversioning circuit and ring
Border dose rate instrument can be realized by another way.Embodiments described above is only schematical, for example, described
The division of unit is only a kind of division of logic function, can there is other dividing mode in actual implementation, in another example, it is multiple
Unit or component may be combined or can be integrated into another system or some features can be ignored or does not perform.It is another
Point, shown or discussed mutual coupling, direct-coupling or communication connection can be by some communication interfaces, dress
It puts or the INDIRECT COUPLING of unit or communication connection, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the utility model can be integrated in a processing unit,
Can be that unit is individually physically present, can also two or more units integrate in a unit.
Finally it should be noted that：Embodiment described above is only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the scope of protection of the utility model is not limited thereto, although with reference to foregoing
The utility model is described in detail in embodiment, it will be understood by those of ordinary skill in the art that：It is any to be familiar with this skill
It, still can be to the skill recorded in previous embodiment in the technical scope that the technical staff in art field discloses in the utility model
Art scheme, which is modified or can be readily occurred in, to be changed or carries out equivalent substitution to which part technical characteristic；And these modifications,
Variation is replaced, and the essence of appropriate technical solution is not made to depart from the spirit and model of the utility model embodiment technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model described should be wanted with right
Subject to the protection domain asked.
Claims (10)
1. a kind of voltage frequency conversioning circuit, which is characterized in that including：First integral amplification module connected in sequence, the second product
Divide amplification module, comparator and trigger；
The first integral amplification module obtains first voltage signal for carrying out integration amplification to the electric quantity signal of input；Institute
Second integral amplification module is stated for carrying out integration amplification to the first voltage signal, obtains pulse broadening, amplitude is amplified
Second voltage signal；The comparator is for the second voltage signal and the activation threshold value of setting, when the described second electricity
When pressing signal more than the activation threshold value, enable signal is exported to the trigger；The trigger makes according to reception
Energy signal, output frequency clock pulses corresponding with the electric quantity signal.
2. voltage frequency conversioning circuit according to claim 1, which is characterized in that the first integral amplification module includes
First operational amplifier, the first capacitance and first resistor；
The input terminal of first operational amplifier is used to receive the electric quantity signal, the output terminal of first operational amplifier
It is connected with the second integral amplification module；One end of first capacitance and the input terminal of first operational amplifier connect
It connects, the other end of first capacitance is connected with the output terminal of first operational amplifier；The first resistor is connected in parallel on institute
It states on the first capacitance.
3. voltage frequency conversioning circuit according to claim 2, which is characterized in that the second integral amplification module includes
Second operational amplifier, the second capacitance and second resistance；
The input terminal of the second operational amplifier is connected with the output terminal of first operational amplifier, and second computing is put
The output terminal of big device is connected with the comparator；One end of second capacitance connects with the input terminal of the second operational amplifier
It connects, the other end of second capacitance is connected with the output terminal of the second operational amplifier；The second resistance is connected in parallel on institute
It states on the second capacitance.
4. voltage frequency conversioning circuit according to claim 3, which is characterized in that the first integral amplification module when
Between constant be more than the second integral amplification module time constant；The capacity of first capacitance is less than second capacitance
Capacity, the resistance value of the first resistor are more than the resistance value of the second resistance.
5. voltage frequency conversioning circuit according to claim 3, which is characterized in that first operational amplifier, described
Second operational amplifier, the comparator, the trigger are complementary metal oxide semiconductor cmos device.
6. voltage frequency conversioning circuit according to claim 5, which is characterized in that first operational amplifier includes
AD8622 chips, the second operational amplifier include SGM321 chips.
7. voltage frequency conversioning circuit according to claim 1, which is characterized in that the comparator includes TLV3201 cores
Piece, the trigger include CD4011 chips.
8. a kind of Environmental dose rate instrument, which is characterized in that including the electric voltage frequency as any one of the claims 1-7
Conversion circuit further includes radiation detector and microcontroller；
The radiation detector is connected with the first integral amplification module of the voltage frequency conversioning circuit, and grain is radiated for detecting
The electric quantity signal of son, and export the electric quantity signal to the voltage frequency conversioning circuit；The voltage frequency conversioning circuit is also
Be connected with the microcontroller, for pass through the trigger to the microcontroller output frequency it is corresponding with the electric quantity signal when
Clock；Count value is converted to the radiating particle by the microcontroller for being counted to the clock pulses
Particle energy.
9. Environmental dose rate instrument according to claim 8, which is characterized in that the radiation detector includes semiconductor probe
Device or gas ionization detector.
10. Environmental dose rate instrument according to claim 8, which is characterized in that the Environmental dose rate instrument further includes display
Screen, the display screen are connected with the microcontroller；
The microcontroller is additionally operable to export the particle energy to the display screen, and the display screen is used to show the particle energy
Amount.
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| CN201721540492.9U CN207380256U (en) | 2017-11-16 | 2017-11-16 | Voltage frequency conversioning circuit and Environmental dose rate instrument |
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| CN201721540492.9U CN207380256U (en) | 2017-11-16 | 2017-11-16 | Voltage frequency conversioning circuit and Environmental dose rate instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781430A (en) * | 2020-06-19 | 2020-10-16 | 宁波甬东核辐射监测有限公司 | Device and method for simulating X and gamma dose rate measurement in passive mode |
| CN113295911A (en) * | 2021-05-25 | 2021-08-24 | 中国核动力研究设计院 | Nuclear instrument system micro-current measuring method and processing device based on current conversion frequency |
-
2017
- 2017-11-16 CN CN201721540492.9U patent/CN207380256U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781430A (en) * | 2020-06-19 | 2020-10-16 | 宁波甬东核辐射监测有限公司 | Device and method for simulating X and gamma dose rate measurement in passive mode |
| CN111781430B (en) * | 2020-06-19 | 2021-05-18 | 宁波甬东核辐射监测有限公司 | Device and method for simulating X and gamma dose rate measurement in passive mode |
| CN113295911A (en) * | 2021-05-25 | 2021-08-24 | 中国核动力研究设计院 | Nuclear instrument system micro-current measuring method and processing device based on current conversion frequency |
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