CN201060170Y - Cigarette denseness microwave testing apparatus - Google Patents
Cigarette denseness microwave testing apparatus Download PDFInfo
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- CN201060170Y CN201060170Y CNU2007200240157U CN200720024015U CN201060170Y CN 201060170 Y CN201060170 Y CN 201060170Y CN U2007200240157 U CNU2007200240157 U CN U2007200240157U CN 200720024015 U CN200720024015 U CN 200720024015U CN 201060170 Y CN201060170 Y CN 201060170Y
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Abstract
The utility model belongs to the tobacco processing field, relates to a cigarette roll density measuring device. The measuring device consists of a microwave signal producing circuit, a microwave cavity resonator with microwave signal inputting and outputting ports, a microwave energy detector circuit, a singlechip, and a thermostatic apparatus. Microwave signals produced by the microwave signal producing circuit is transmitted into the microwave cavity resonator through the microwave signal inputting port; the microwave signal producing circuit is connected with the microwave energy detector circuit through the microwave signal outputting port, and the output signal of the microwave energy detector circuit is transmitted to the singlechip for processing. The utility model is characterized in that the microwave signal producing circuit consists of a double-frequency frequency compound signal generating signal producing circuit and an automatic amplitude stabilizer circuit, and the automatic amplitude stabilizer circuit, the microwave cavity resonator, and the microwave energy detector circuit are all arranged in the thermostatic apparatus. The variety of the microwave signal energy inputted and outputted in the microwave cavity resonator of the measuring device depends on the density of the cigarette rolls passing through the microwave cavity resonator, cannot affected by the ambient temperature. The exactness and the stability of the measuring can be ensured.
Description
Affiliated technical field
The utility model belongs to the tobacco manufacture field, relates to a kind of density of tobacco rod pick-up unit.
Technical background
Cigarette machine is the substantially constant that guarantees cigarette weight in the process that the production cigarette props up, and by detecting plume density and cooperating with weight control system, finishes the control of cigarette weight together.The detection method of density of tobacco rod is a lot, and adopt more in the equipment is that the detection of the transmission amount by radioelement realizes in the past, and this method detection speed is fast, precision and stability are high, but exists radioactive source to need the shortcoming of strict control.The method that adopts microwave resonance to detect has appearred in recent years, when this method utilizes cigarette to prop up by microwave electromagnetic field, the plume of different densities and water cut will cause the measuring principle that the difference of microwave electromagnetic field energy parameter changes, by energy parameter is detected, and, finally obtain the real-time density value of plume by signal analysis.The detection method of microwave resonance is compared with the method that radioactive source detects, and exists the shortcoming of precision and less stable.
The utility model content
The purpose of this utility model is the shortcoming that overcomes prior art, and the density of tobacco rod microwave detecting device of a kind of accuracy of detection height and detection good stability is provided.
The technical scheme that the utility model adopted is: this density of tobacco rod microwave detecting device, by microwave signal produce circuit, have the microwave signal input, microwave cavity, microwave energy testing circuit and the single-chip microcomputer of output port, thermostat form, microwave cavity is in the thermostat, and microwave signal produces the microwave signal of circuit generation and injects microwave cavity through the microwave signal input port; Connect the microwave energy testing circuit through the microwave signal output port, the output signal of microwave energy testing circuit send single-chip microcomputer to handle, characteristics are that described microwave signal produces circuit employing double frequency frequency synthesized signal generation circuit and active leveling circuit constitutes, and active leveling circuit, microwave cavity and microwave energy testing circuit are all in thermostat.
Described double frequency frequency synthesized signal generation circuit is by the crystal resonant circuit, two by monolithic processor controlled phase-locked loop circuit, programmable circuit, HF switch switches chip and the Microwave Phase--Locked Loop circuit is formed, described two phase-locked loop circuits are by the frequency division phase detector, the integral operation circuit, voltage controlled oscillator and merit parallel circuit constitute, described pair of microlock loop circuit is by phase detector, the integral operation circuit, voltage controlled oscillator, merit parallel circuit and frequency divider constitute, the frequency signal of crystal resonant circuit output divides three the tunnel, two-way enters two respectively by monolithic processor controlled phase-locked loop circuit, and the output of two phase-locked loop circuits connects the input end that HF switch is switched chip; Third Road is sent into programmable circuit, outputs control signals to HF switch by programmable circuit and switches chip, and the output that HF switch is switched chip connects two microlock loop circuits.
Described active leveling circuit is made up of microwave amplifiercation circuit, directional coupler, detecting circuit, summation integral operation circuit, electrically controlled attenuator, the double frequency frequency synthesized signal enters electrically controlled attenuator, the output of electrically controlled attenuator connects microwave amplifiercation circuit, the output of microwave amplifiercation circuit connects directional coupler, the output one tunnel of directional coupler connects detecting circuit, another road output microwave signal is to microwave cavity, the output of detecting circuit and reference voltage enter summation integral operation circuit, and the output of summation integral operation circuit enters electrically controlled attenuator.
Described microwave signal energy measuring circuit is by the signal demodulator circuit, the temperature compensation detecting circuit, the temperature compensation discharge circuit, time sharing sampling circuit C, time sharing sampling circuit D, the summation operation amplifying circuit, ask the difference operation amplifying circuit, and two A/D converters are formed, the microwave signal output of microwave cavity connects the signal demodulator circuit, the signal demodulator circuit, the output of temperature compensation detecting circuit enters the temperature compensation discharge circuit, the output of temperature compensation discharge circuit meets time sharing sampling circuit C and time sharing sampling circuit D simultaneously, the output of two time sharing sampling circuit enters summation and asks the difference operation amplifying circuit, sues for peace and the output of asking the difference operation amplifying circuit is sent into single-chip microcomputer through two A/D converters and handled.
Principle of work of the present utility model is as described below: double frequency frequency synthesized signal generation circuit produces the microwave signal of frequency stabilization, realize the switching of two frequency signals by HF switch, microwave signal is input to microwave cavity after controlling through fixed ampllitude, the microwave cavity resonance characteristic is influenced by plume, and the microwave signal of output obtains density of tobacco rod information after the energy measuring electric circuit inspection send single-chip microcomputer to handle.Because active leveling circuit, microwave cavity and microwave energy testing circuit are all in thermostat, make into and out of the variation of the microwave signal energy of microwave cavity only relevant with density of tobacco rod by microwave cavity, be not subjected to the influence of environment temperature, guarantee the precision and the stability that detect.
Double frequency frequency synthesized signal generation circuit produces frequency signal by the crystal resonant circuit, export three the tunnel altogether: wherein two paths of signals is as the reference frequency of phaselocked loop, two phase-locked loop circuit hardware circuits constitute in full accord, it all is the negative feedback phase-locked loop that constitutes by Voltage-Controlled oscillation circuit, merit parallel circuit, frequency division phase detector, integral operation circuit, send different divider ratio a and b by single-chip microcomputer, make two phase-locked loop output different frequency f1 and f1+ Δ f, two frequency signals output to two input ends that HF switch is switched chip simultaneously; The Third Road signal is input to programmable circuit, behind the programmable circuit frequency division, produce a dutycycle and be 1: 1 pulse signal, use this pulse signal control HF switch to switch chip, when the pulse signal high-low level is effective respectively, can makes HF switch switch the chip two-way and open respectively, and high-low level is when switching, can make two paths of signals switch output, can obtain the single channel two-frequency signal of time-division switching, and pulsed frequency be the signal switching frequency.Two microlock loop circuits are made up of phase detector, integral operation circuit, voltage controlled oscillator, merit parallel circuit, frequency dividing circuit, and they constitute a negative feedback phase-locked loop.The single channel two-frequency signal that uses the time-division switching is as the Microwave Phase--Locked Loop reference signal, the microwave composite signal also switches thereupon when reference signal is switched, because reference signal is two signals that switch the time-division, the microwave signal that obtains is the time-division switch dual microwave signal of single channel output.This signal is admitted to active leveling circuit.
Active leveling circuit is made up of microwave amplifiercation circuit, directional coupler, detecting circuit, summation integral operation circuit and electrically controlled attenuator, and they constitute negative feedback fixed ampllitude loop.Time-division switch dual microwave signal is input to electrically controlled attenuator, after microwave amplifiercation circuit amplifies, send into directional coupler, directional coupler is coupled out part power in proportion, produce a detecting circuit and preset the reference voltage integral operation of suing for peace behind wave detector, summation integral operation circuit output voltage FEEDBACK CONTROL electrically controlled attenuator is formed backfeed loop makes the output of microwave signal power invariability.Detecting circuit is a two-way, and one the tunnel carries out detection to microwave signal, and temperature and the zero point drift influence to detection can be effectively eliminated in one tunnel detection over the ground.Microwave signal is through the constant microwave signal of power active leveling circuit output power, and this signal injects microwave cavity through the microwave signal input port, and cigarette props up by microwave cavity, and the frequency characteristic of microwave cavity is influenced by plume.Adopt microwave signal energy measuring circuit that the microwave signal of microwave cavity output port output is detected, thereby obtain density of tobacco rod information.
Microwave signal energy measuring circuit adopts the two-way pickup mode, one the tunnel carries out detection to the microwave signal of microwave cavity output port output, one tunnel temperature compensation detection over the ground, carry out computing through the temperature compensation computing circuit, compute mode is the twice of two-way detection difference, and the temperature compensation detection can effectively compensate because temperature variation and zero point drift cause the signal demodulator deviation to obtain pure microwave signal detecting circuit value.Time sharing sampling circuit C and time sharing sampling circuit D sample to the signal of temperature compensation computing circuit output respectively, the pulse signal that uses two phase phasic differences 180 to spend is sent out and is controlled two high-speed sampling circuit respectively, two sample circuits are sampled to the detection operation values of two microwave signals respectively, and each sample circuit is exported a kind of microwave signal detection operation values respectively.Two sample circuit sampled values after rear end summation discharge circuit and A/D conversion, obtain two frequency signals energy and, i.e. summation output; The sampled value of two sample circuits obtains the energy difference of two frequency signals after poor discharge circuit and A/D conversion are asked in the rear end, promptly ask difference output.With the summation output of two frequency signals of microwave signal energy measuring circuit output with ask difference output to send into single-chip microcomputer to carry out analyzing and processing and can obtain density of tobacco rod information.
The utility model since active leveling circuit, microwave cavity and microwave energy testing circuit all in thermostat, variation into and out of the microwave signal energy of microwave cavity is only relevant with the density of tobacco rod by microwave cavity, be not subjected to the influence of environment temperature, guarantee the accurate and stability that detects.Owing to adopt double frequency frequency synthesized signal generation circuit to produce a kind of and approaching frequency synthesized signal of microwave cavity frequency, realize the switching of two frequencies by the mode of time-division, realize the energy constant output of microwave signal by active leveling circuit, microwave signal energy measuring circuit adopts the two-way pickup mode, can effectively compensate because temperature variation and zero point drift cause the signal demodulator deviation to obtain pure microwave signal detecting circuit value, adopted the time sharing sampling circuit C and the time sharing sampling circuit D of high-speed sampling respectively the signal of temperature compensation computing circuit output to be sampled, sampling precision height and speed are fast, and the sampled signal of output is through the summation operation amplifying circuit, ask the difference operation amplifying circuit after send the single-chip microcomputer analyzing and processing to obtain density of tobacco rod information after the A/D conversion.Density of tobacco rod microwave detecting device accuracy of detection height provided by the utility model, good stability and speed are fast.
Description of drawings
Fig. 1 is the structured flowchart of density of tobacco rod microwave detecting device provided by the utility model;
Fig. 2 is the frame principle figure of double frequency frequency synthesized signal generation circuit in the utility model;
Fig. 3 is the frame principle figure of active leveling circuit in the utility model;
Fig. 4 is the frame principle figure of microwave signal energy measuring circuit in the utility model;
Fig. 5 is the embodiment figure of thermostat in the utility model;
Fig. 6 is the structural profile synoptic diagram of microwave cavity in the utility model;
Fig. 7 is the circuit theory diagrams of double frequency frequency synthesized signal generation circuit among the utility model embodiment;
Fig. 8 is the circuit theory diagrams of active leveling circuit among the utility model embodiment;
Fig. 9 is the circuit theory diagrams of microwave signal energy measuring circuit among the utility model embodiment.
Embodiment
Below in conjunction with description of drawings enforcement of the present utility model.The utility model is made up of microwave signal generation circuit, microwave cavity, microwave signal energy measuring circuit, single-chip microcomputer and thermostat that double frequency frequency synthesized signal generation circuit, active leveling circuit constitute as shown in Figure 1, all in thermostat, microwave signal produces the microwave signal of circuit generation and injects microwave cavity through the microwave signal input port for active leveling circuit, microwave cavity, microwave signal energy measuring circuit; Connect the microwave energy testing circuit through the microwave signal output port, the output signal of microwave energy testing circuit obtains density of tobacco rod information after sending single-chip microcomputer to handle.Fig. 2-Fig. 4 is respectively the frame principle figure of double frequency frequency synthesized signal generation circuit, active leveling circuit and microwave energy testing circuit in the utility model, and Fig. 7-Fig. 9 is respectively the circuit theory diagrams of double frequency frequency synthesized signal generation circuit, active leveling circuit and microwave energy testing circuit among the utility model embodiment.By Fig. 2, Fig. 7 as can be known: double frequency frequency synthesized signal generation circuit switches chip by crystal resonant circuit, two by monolithic processor controlled phase-locked loop circuit, programmable circuit, HF switch and two locked loops are formed in the utility model, frequency signal by the output of crystal resonant circuit divides three the tunnel, two-way enters two respectively by monolithic processor controlled phase-locked loop circuit, and the output of two phase-locked loop circuits connects the input end that HF switch is switched chip; Third Road is sent into programmable circuit, outputs control signals to HF switch by programmable circuit and switches chip, and the output that HF switch is switched chip connects two locked loops.Described two is respectively frequency division phase detector D by monolithic processor controlled phase-locked loop circuit
1, by operational amplifier D
3And peripheral resistance R
4, R
5, capacitor C
3The integral operation circuit that constitutes is by transistor V
1And peripheral resistance R
6-R
9, inductance L
1-L
3, capacitor C
5-C
8, diode V
5The voltage controlled oscillator that constitutes and by T shape resistor network R
10, R
11, R
12Phase-locked loop circuit A and frequency division phase detector D that the merit parallel circuit that constitutes is formed
2, by operational amplifier D
4And peripheral resistance R
15, R
16, capacitor C
4The integral operation circuit that constitutes is by transistor V
2And peripheral resistance R
17-R
20, inductance L
4-L
6, capacitor C
9-C
12, diode V
6The voltage controlled oscillator that constitutes and by T shape resistor network R
21, R
22, R
23The phase-locked loop circuit B that the merit parallel circuit that constitutes is formed, frequency division phase detector D
1, D
2Data input pin DA, clock signal input terminal CLK, enable to control CE and join with data bus, clock bus and address 2, the address 1 of single-chip microcomputer respectively, reference frequency input end REF connects the output of crystal resonant circuit G1, frequency division phase detector D
1, D
2Prison phase voltage output terminal PD pass through resistance R respectively
4, R
15Meet operational amplifier D
3, D
4Inverting input, operational amplifier D
3, D
4Output connect inductance L respectively
1, L
5, transistor V
1, V
2Collector pass through capacitor C respectively
13, C
14Connect the resistance R of merit parallel circuit
10, R
21, the resistance R of merit parallel circuit
12, R
23Meet frequency division phase detector D respectively
1, D
2Fractional frequency signal input end F1, the resistance R of merit parallel circuit
11, R
22Connect the input end of high frequency change-over switch, pulse control signal enters high frequency change-over switch D
5Signal input end A, B, this pulse control signal is that produce dutycycle by crystal resonant circuit G1 output, behind the programmable circuit frequency division be 1: 1 pulse control signal, has omitted programmable circuit among Fig. 7.Described couple of Microwave Phase--Locked Loop route phase detector D
7, by operational amplifier D
6And peripheral resistance R
24-R
27, capacitor C
17The integral operation circuit that constitutes, voltage controlled oscillator VCO chip D
8With by T shape resistor network R
29-R
31The merit parallel circuit and the frequency dividing circuit D that constitute
9, D
10Constitute phase detector D
7Signal input part IN1 connect the output terminal of high frequency change-over switch, its signal output part T1, T2 meet operational amplifier D
6Two input ends, operational amplifier D
6Output terminal pass through resistance R
28Meet voltage controlled oscillator VCO chip D
8Control voltage input terminal VTUNE, voltage controlled oscillator VCO chip D
8Frequency signal output terminal TFOUT connect the resistance R of merit parallel circuit
29, the resistance R of merit parallel circuit
31Meet frequency dividing circuit D
9, D
10, frequency dividing circuit D
10Output enter phase detector D
7Signal input part IN2.For guaranteeing good frequency switching time, two-way phase-locked loop hardware circuit as the reference signal is just the same, and to adopt dutycycle be that 1: 1 pulse signal control HF switch is switched chip and directly switched the phase-locked loop frequency reference, obtains the time-division switch dual microwave signal of single channel output.By Fig. 3, Fig. 8 as can be known: active leveling circuit is made up of microwave amplifiercation circuit, directional coupler, detecting circuit, summation integral operation circuit, electrically controlled attenuator.Time-division switch dual microwave signal is input to electrically controlled attenuator, after microwave amplifiercation circuit amplifies, send into directional coupler, directional coupler is coupled out part power in proportion, produce a detecting circuit and preset the reference voltage integral operation of suing for peace after detection, summation integral operation circuit output voltage FEEDBACK CONTROL electrically controlled attenuator is formed backfeed loop makes the output of microwave signal power invariability.Described microwave amplifiercation circuit is by mmic power amplifier D
12, intermediate power amplifier D
13Form; Detecting circuit is by resistance R
32, R
33, R
36, inductance L
9, L
10, capacitor C
33And detection tube V
3The signal demodulator circuit that constitutes and by resistance R
34, R
35, R
37, inductance L
11, capacitor C
34And detection tube V
4The detecting circuit over the ground that constitutes is formed; Summation integral operation circuit is by operational amplifier D
17, D
18, D
19And peripheral resistance R
38-R
48, capacitor C
26Constitute; Electrically controlled attenuator D
11Signal input part RFIN connect the output of double frequency frequency synthesized signal generation circuit, its signal output part RFOUT passes through capacitor C
23Order sheet power amplifier D
12Input end, directional coupler D
14Input meet intermediate power amplifier D
13Output, directional coupler D
14Output by isolator D
15Meet microwave cavity D
16Microwave signal input port IN, resistance R is passed through in its coupling output
33Meet the detection tube V of signal demodulator circuit
3, the signal demodulator circuit, resistance R is passed through in the output of detecting circuit respectively over the ground
39, R
41Meet operational amplifier D in the summation integral operation circuit
17, D
18In-phase input end, operational amplifier D in the summation integral operation circuit
19Output pass through resistance R
49Meet the attenuator D that sets the tone
11Voltage input end V1.Detecting circuit adopts two microwave tube detection modes, and two detection tubes are same cast, and one the tunnel carries out detection to microwave signal, and temperature and the zero point drift influence to detection tube can be effectively eliminated in one tunnel detection over the ground.For guaranteeing that signal has enough power indexs, microwave amplifiercation circuit adopts monolithic to amplify and the two-stage of middle power amplification combination is amplified mode, simultaneously in order to reduce the microwave signal power attenuation, the composite board of microwave sheet material and common sheet material combination is adopted in printed board, and directional coupler and detecting circuit adopt ceramic microstrip circuit to realize.Because two microwave signals that microwave signal is a time division high speed to be switched, so the loop response time that requires active leveling circuit much smaller than microwave switching time.Effectively adjust the summation scale-up factor of summing circuit, adjust the difference of fixed ampllitude power and peak power, electrically controlled attenuator is operated in the linear attenuation district, suitably choose summation integrating circuit loop bandwidth simultaneously, can guarantee the loop response time of auto_steady amplitude loop.By Fig. 4, Fig. 9 is as can be known: microwave signal energy measuring circuit is by the signal demodulator circuit, the temperature compensation detecting circuit, the temperature compensation discharge circuit, time sharing sampling circuit C, time sharing sampling circuit D, the summation operation amplifying circuit, ask the difference operation amplifying circuit, and two A/D converters are formed, the microwave signal output of microwave cavity connects the signal demodulator circuit, the signal demodulator circuit, the output of temperature compensation detecting circuit enters the temperature compensation discharge circuit, the output of temperature compensation discharge circuit meets time sharing sampling circuit C and time sharing sampling circuit D simultaneously, the output of two time sharing sampling circuit enters summation and asks the difference operation amplifying circuit, sues for peace and the output of asking the difference operation amplifying circuit is sent into single-chip microcomputer through A/D converter and handled.The signal demodulator circuit of microwave signal energy measuring circuit is by resistance R
52, R
53, R
55, inductance L
13, L
14, capacitor C
36And detection tube V
8Constitute, the temperature compensation detecting circuit is by resistance R
50, R
51, R
54, inductance L
12, capacitor C
35And detection tube V
7Constitute; The temperature compensation discharge circuit is by operational amplifier D
20, D
21And peripheral resistance R
56-R
63Constitute; Time sharing sampling circuit C, time sharing sampling circuit D are respectively by high-speed sampler D
22, D
23Constitute; The summation operation amplifying circuit is by operational amplifier D
24, D
26And peripheral resistance R
68, R
69, R
72, R
74, R
76, R
78, R
80And capacitor C
27Constitute; Ask the difference operation amplifying circuit by operational amplifier D
25, D
27And peripheral resistance R
70, R
71, R
73, R
75, R
77, R
79And capacitor C
28Constitute; Microwave cavity D
16Microwave signal output connect the resistance R of signal demodulator circuit
53, the inductance L in temperature compensation detection, the signal demodulator circuit
12, L
14Pass through resistance R respectively
57, R
59Meet operational amplifier D
20, D
21In-phase input end, operational amplifier D
21Output terminal pass through resistance R
64, R
66Meet sampling thief D respectively
22, D
23Input end IN, pulse control signal passes through resistance R respectively
65, R
67Enter sampling thief D
22, D
23The pulse control signal input end, sampling thief D
22, D
23Output pass through resistance R
68, R
69Enter operational amplifier D
24In-phase input end, sampling thief D
22, D
23Output pass through resistance R respectively
71, R
70Enter operational amplifier D
25In-phase input end and inverting input, operational amplifier D
26, D
27Output pass through resistance R respectively
78, R
79Meet A/D converter D
28, D
29Signal input part AIN, A/D converter D
28, D
29The summing signal of output with ask difference signal to send into the single-chip microcomputer analysis, handle after, obtain density of tobacco rod information.This microwave signal energy measuring circuit adopts two-tube detection mode, two detection tube cores are same cast, one the tunnel carries out detection to microwave signal, one tunnel detection over the ground, carry out computing through the temperature compensation computing circuit, compute mode is the twice of two-way detection difference, can effectively compensate because temperature variation and zero point drift to the influence of detection tube.(cycle of pulse signal is identical with input pair microwave signal switching cycles to adopt the pulse signal of two phase phasic differences 180 degree, identical or phase phasic difference 180 degree of phase place) control two sampling thiefs respectively, obtain the detecting circuit value of two microwave signals, improved the precision of density of tobacco rod detected value more.
Fig. 6 is the structural profile synoptic diagram of microwave cavity in the utility model.As seen from the figure: microwave cavity is made up of cigarette subchannel 1, cavity 2, chamber lid 3, conduit 4, microwave input port 5 and microwave output port 6, with screw that cavity 2 and chamber lid 3 is closely fixing, the middle hollow body cigarette subchannel 1 that forms, when the cigarette of surveying props up by resonator cavity by microwave irradiation, calculate the variation of microwave eigenwert and can determine the density that the cigarette of surveying props up, therefore resonator cavity should have the good dimensional stability and the symmetry of shape.The linear expansion coefficient of iron-nickel alloy 4J36 (invar alloy) has only 1/tens of plain metal, is used to process the requirement that microwave cavity can satisfy dimensional stability; It is because easily processing and the body that can guarantee symmetry that hollow body is processed into right cylinder.In addition, therefore the anti-corrosion property of resonator cavity and electric conductivity also can take whole gold-plated processing to measuring accuracy.Influence measuring accuracy for avoiding tobacco waste and dust to enter cavity, cigarette props up when passing resonator cavity and is surrounded by wear-resisting engineering plastics conduit 4.Fig. 5 is the embodiment figure of thermostat in the utility model.This be a kind of can Fast Heating and the device of temperature constant, be used to guarantee that the constant temperature of microwave cavity and active leveling circuit, microwave signal energy measuring circuit working are at temperature constant state.This thermostat includes the power device that offers the heated object energy at least, can be resistance type heater or transistor type well heater; Sensor that can temperature-sensitive; Can read temperature also can provide the intelligent cell of control; The D/A conversion of control heater work; Proportional and integral controller and power amplifier unit can be formed a closed loop thermostat by these several parts.For guaranteeing that microwave cavity and microwave signal energy measuring circuit away from environment temperature, require to have enough power heater.For guaranteeing the temperature homogeneity of active leveling circuit, microwave cavity and microwave signal energy measuring circuit, can select whole heating or branch type of heating.For the integral body heating, the heating plate at different heated object customization respective shapes for the branch heating, requires the symmetrical distribution well heater on heated object, guarantee to have two or more well heaters at least.For guaranteeing good thermal effect and the protection well heater of adding, requiring has good level and smooth contacting between well heater and the heated object.For guaranteeing temperature detection authenticity and accuracy, need more than one temperature sensor at least.Single temperature sensor should be arranged on the relative center of measured body, and a plurality of temperature sensors then should evenly distribute on measured body, and temperature sensor should have direct with temperature measured object or contact by the good of third party's medium.For guaranteeing the accuracy of detection of thermostat, require to have the temperature sensor of enough accuracy of detection, for guaranteeing control accuracy, require at least 8 D/A converter to well heater, adopt proportional integral PI regulative mode, guarantee the smoothness of thermostat at temperature control point.For guaranteeing the normal operation of well heater, the power amplifier part should have enough driving forces.Can learn by above analysis: the utility model takes multinomial measure to guarantee the accuracy of detection and stability of density of tobacco rod microwave detecting device, and has the fast characteristics of measuring speed, and device also has the advantage of compact conformation simultaneously.
Claims (7)
1. density of tobacco rod microwave detecting device, by microwave signal produce circuit, have the microwave signal input, microwave cavity, microwave energy testing circuit and the single-chip microcomputer of output port, thermostat form, microwave cavity is in the thermostat, and microwave signal produces the microwave signal of circuit generation and injects microwave cavity through the microwave signal input port; Connect the microwave energy testing circuit through the microwave signal output port, the output signal of microwave energy testing circuit send single-chip microcomputer to handle, it is characterized in that described microwave signal produces circuit and adopts double frequency frequency synthesized signal generation circuit and active leveling circuit to constitute, active leveling circuit, microwave cavity and microwave energy testing circuit are all in thermostat.
2. density of tobacco rod microwave detecting device according to claim 1, it is characterized in that described double frequency frequency synthesized signal generation circuit is by the crystal resonant circuit, two by monolithic processor controlled phase-locked loop circuit, programmable circuit, HF switch switches chip and two Microwave Phase--Locked Loop circuit is formed, described two phase-locked loop circuits are by the frequency division phase detector, the integral operation circuit, voltage controlled oscillator and merit parallel circuit constitute, described pair of microlock loop circuit is by phase detector, the integral operation circuit, voltage controlled oscillator, merit parallel circuit and frequency divider constitute, the frequency signal of crystal resonant circuit output divides three the tunnel, two-way enters two respectively by monolithic processor controlled phase-locked loop circuit, and the output of two phase-locked loop circuits connects the input end that HF switch is switched chip; Third Road is sent into programmable circuit, outputs control signals to HF switch by programmable circuit and switches chip, and the output that HF switch is switched chip connects two microlock loop circuits.
3. density of tobacco rod microwave detecting device according to claim 1 and 2 is characterized in that in the described double frequency frequency synthesized signal generation circuit that two is respectively frequency division phase detector (D by monolithic processor controlled phase-locked loop circuit
1), by operational amplifier (D
3) and peripheral resistance (R
4, R
5), electric capacity (C
3) constitute the integral operation circuit, by transistor (V
1) and peripheral resistance (R
6-R
9), inductance (L
1-L
3), electric capacity (C
5-C
8), diode (V
5) constitute voltage controlled oscillator, by T shape resistor network (R
10, R
11, R
12) the merit parallel circuit that constitutes the phase-locked loop circuit A and the frequency division phase detector (D that form
2), by operational amplifier (D
4) and peripheral resistance (R
15, R
16), electric capacity (C
4) constitute the integral operation circuit, by transistor (V
2) and peripheral resistance (R
17-R
20), inductance (L
4-L
6), electric capacity (C
9-C
12), diode (V
6) constitute voltage controlled oscillator, by T shape resistor network (R
21, R
22, R
23) the phase-locked loop circuit B that forms of the merit parallel circuit that constitutes, frequency division phase detector (D
1, D
2) data input pin (DA), clock signal input terminal (CLK), enable control (CE) and join with the data bus (DA) of single-chip microcomputer, clock bus (CLK) and address 2 (EN2), address 1 (EN1) respectively, reference frequency input end (REF) is by electric capacity (C
1), resistance (R
2, R
1) meet crystal resonant circuit (G
1) output, frequency division phase detector (D
1, D
2) prison phase voltage output terminal (PD) respectively by resistance (R
4, R
15) meet operational amplifier (D
3, D
4) inverting input, operational amplifier (D
3, D
4) output meet inductance (L respectively
1, L
5), transistor (V
1, V
2) collector respectively by electric capacity (C
13, C
14) meet the resistance (R of merit parallel circuit
10, R
21), the resistance (R of merit parallel circuit
12, R
23) meet frequency division phase detector (D respectively
1, D
2) fractional frequency signal input end (F1), the resistance (R of merit parallel circuit
11, R
22) meet high frequency change-over switch (D
5) input end; Pulse control signal enters high frequency change-over switch (D
5) signal input end (A, B), described pair of microlock loop circuit is by phase detector (D
7), by operational amplifier (D
6) and peripheral resistance (R
24-R
27), electric capacity (C
17) the integral operation circuit, the voltage controlled oscillator VCO chip (D that constitute
8), by T shape resistor network (R
29-R
31) the merit parallel circuit and the frequency dividing circuit (D that constitute
9, D
10) constitute phase detector (D
7) signal input part (IN1) connect the output terminal of high frequency change-over switch, its signal output part (T1, T2) meets operational amplifier (D
6) two input ends, operational amplifier (D
6) output by resistance (R
28) meet voltage controlled oscillator VCO chip (D
8) control voltage input terminal (VTUNE), voltage controlled oscillator VCO chip (D
8) frequency signal output terminal (TFOUT) meet the resistance (R of merit parallel circuit
29), the resistance (R of merit parallel circuit
31) meet frequency dividing circuit (D
9, D
10), frequency dividing circuit (D
10) output enter phase detector (D
7) signal input part (IN2).
4. density of tobacco rod microwave detecting device according to claim 1, it is characterized in that described active leveling circuit is by microwave amplifiercation circuit, directional coupler, detecting circuit, summation integral operation circuit, electrically controlled attenuator is formed, the double frequency frequency synthesized signal enters electrically controlled attenuator, the output of electrically controlled attenuator connects microwave amplifiercation circuit, the output of microwave amplifiercation circuit connects directional coupler, the output one tunnel of directional coupler connects detecting circuit, another road output microwave signal is to microwave cavity, the output of detecting circuit and reference voltage enter summation integral operation circuit, and the output of summation integral operation circuit enters electrically controlled attenuator.
5. according to claim 1 or 4 described density of tobacco rod microwave detecting devices, it is characterized in that microwave amplifiercation circuit is by mmic power amplifier (D in the described active leveling circuit
12), intermediate power amplifier (D
13) form; Detecting circuit is by resistance (R
32, R
33, R
36), inductance (L
9, L
10), electric capacity (C
33) and detection tube (V
3) the signal demodulator circuit that constitutes and by resistance (R
34, R
35, R
37), inductance (L
11), electric capacity (C
34) and detection tube (V
4) detecting circuit over the ground that constitutes forms; Summation integral operation circuit is by operational amplifier (D
17, D
18, D
19) and peripheral resistance (R
38-R
48), electric capacity (C
26) constitute; Electrically controlled attenuator (D
11) signal input part (RFIN) connect the output of double frequency frequency synthesized signal generation circuit, its signal output part (RFOUT) is by electric capacity (C
23) order sheet power amplifier (D
12) input end, directional coupler (D
14) input meet intermediate power amplifier (D
13) output, directional coupler (D
14) output by isolator (D
15) meet microwave cavity (D
16) microwave signal input port (IN), its coupling output is by resistance (R
33) meet the detection tube (V of signal demodulator circuit
3), the signal demodulator circuit, the output of detecting circuit is respectively by resistance (R over the ground
39, R
41) meet operational amplifier (D in the summation integral operation circuit
17, D
18) in-phase input end, operational amplifier (D in the summation integral operation circuit
19) output by resistance (R
49) meet electrically controlled attenuator (D
11) voltage input end (V1).
6. density of tobacco rod microwave detecting device according to claim 1, it is characterized in that described microwave signal energy measuring circuit is by the signal demodulator circuit, the temperature compensation detecting circuit, the temperature compensation discharge circuit, time sharing sampling circuit C, time sharing sampling circuit D, the summation operation amplifying circuit, ask the difference operation amplifying circuit, and two A/D converters are formed, the microwave signal output of microwave cavity connects the signal demodulator circuit, the signal demodulator circuit, the output of temperature compensation detecting circuit enters the temperature compensation discharge circuit, the output of temperature compensation discharge circuit meets time sharing sampling circuit C and time sharing sampling circuit D simultaneously, the output of two time sharing sampling circuit enters summation and asks the difference operation amplifying circuit, sues for peace and the output of asking the difference operation amplifying circuit is sent into single-chip microcomputer through two A/D converters and handled.
7. according to claim 1 or 6 described density of tobacco rod microwave detecting devices, it is characterized in that the signal demodulator circuit is by resistance (R in the described microwave signal energy measuring circuit
52, R
53, R
55), inductance (L
13, L
14), electric capacity (C
36) and detection tube (V
8) constitute, the temperature compensation detecting circuit is by resistance (R
50, R
51, R
54), inductance (L
12), electric capacity (C
35) and detection tube (V
7) constitute; The temperature compensation discharge circuit is by operational amplifier (D
20, D
21) and peripheral resistance (R
56-R
63) constitute; Time sharing sampling circuit C, the time sample circuit D respectively by high-speed sampler (D
22, D
23) constitute; The summation operation amplifying circuit is by operational amplifier (D
24, D
26) and peripheral resistance (R
68, R
69, R
72, R
74, R
76, R
78, R
80) and electric capacity (C
27) constitute; Ask the difference operation amplifying circuit by operational amplifier (D
25, D
27) and peripheral resistance (R
70, R
71, R
73, R
75, R
77, R
79) and electric capacity (C
28) constitute; Microwave cavity (D
16) microwave signal output meet the resistance (R of signal demodulator circuit
53), the inductance (L in temperature compensation detection, the signal demodulator circuit
12, L
14) respectively by resistance (R
57, R
59) meet operational amplifier (D
20, D
21) in-phase input end, operational amplifier (D
21) output terminal by resistance (R
64, R
66) meet sampling thief (D respectively
22, D
23) input end (IN), pulse control signal is respectively by resistance (R6
5, R
67) enter sampling thief (D
22, D
23) the pulse control signal input end, sampling thief (D
22, D
23) output by resistance (R
68, R
69) enter operational amplifier (D
24) in-phase input end, sampling thief (D
22, D
23) output respectively by resistance (R
71, R
70) enter operational amplifier (D
25) in-phase input end and inverting input, operational amplifier (D
26, D
27) output by resistance respectively by (R
78, R
79) meet A/D converter (D
28, D
29) signal input part (AIN), A/D converter (D
28, D
29) output signal send into single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200240157U CN201060170Y (en) | 2007-06-20 | 2007-06-20 | Cigarette denseness microwave testing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200240157U CN201060170Y (en) | 2007-06-20 | 2007-06-20 | Cigarette denseness microwave testing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201060170Y true CN201060170Y (en) | 2008-05-14 |
Family
ID=39408649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200240157U Expired - Fee Related CN201060170Y (en) | 2007-06-20 | 2007-06-20 | Cigarette denseness microwave testing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201060170Y (en) |
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| CN102809572A (en) * | 2012-08-08 | 2012-12-05 | 天津大学 | System for measuring solution concentration by using perturbation method |
| CN103018262A (en) * | 2011-09-20 | 2013-04-03 | 豪尼机械制造股份公司 | Microwave rod measuring device |
| CN103960773A (en) * | 2013-01-30 | 2014-08-06 | 豪尼机械制造股份公司 | Measuring Device, Machine And Method For The Tobacco Processing Industry |
| CN104132866A (en) * | 2014-07-07 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Cigarette weight collecting device and method |
| CN104165822A (en) * | 2014-08-19 | 2014-11-26 | 云南中烟工业有限责任公司 | Method for quantitatively evaluating uniformity of cigarette density distribution |
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| CN108088767A (en) * | 2017-12-15 | 2018-05-29 | 中国电子科技集团公司第四十研究所 | A kind of microwave density detector frequency hopping signal generator synchronous detection apparatus and method |
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| CN103018262A (en) * | 2011-09-20 | 2013-04-03 | 豪尼机械制造股份公司 | Microwave rod measuring device |
| EP2572595A3 (en) * | 2011-09-20 | 2015-01-21 | HAUNI Maschinenbau AG | Microwave resonator housing passed by a filiform material with electronic components like the microwave generator being contained within shielded chambers of the housing |
| CN103018262B (en) * | 2011-09-20 | 2017-06-13 | 虹霓机械制造有限公司 | Micro-strip measurement apparatus |
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| CN105547912A (en) * | 2015-12-15 | 2016-05-04 | 中国电子科技集团公司第四十一研究所 | Multipath continuous data acquisition device of two-channel microwave density and humidity detector and data acquisition method using the same |
| CN108088767A (en) * | 2017-12-15 | 2018-05-29 | 中国电子科技集团公司第四十研究所 | A kind of microwave density detector frequency hopping signal generator synchronous detection apparatus and method |
| CN108088767B (en) * | 2017-12-15 | 2019-10-11 | 中国电子科技集团公司第四十一研究所 | A kind of microwave density detector frequency hopping signal generator synchronous detection apparatus and method |
| CN109432603A (en) * | 2018-12-27 | 2019-03-08 | 京信通信系统（中国）有限公司 | A kind of microwave therapy apparatus |
| CN112097815A (en) * | 2020-08-21 | 2020-12-18 | 电子科技大学 | Scattering matrix parameter detection system for microwave sensing |
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