CN104535219A - Liquid temperature detection system and liquid temperature detection method - Google Patents
Liquid temperature detection system and liquid temperature detection method Download PDFInfo
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- CN104535219A CN104535219A CN201410800594.4A CN201410800594A CN104535219A CN 104535219 A CN104535219 A CN 104535219A CN 201410800594 A CN201410800594 A CN 201410800594A CN 104535219 A CN104535219 A CN 104535219A
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Abstract
The invention provides a liquid temperature detection system and a liquid temperature detection method. The detection system comprises a transmitting circuit used for transmitting light rays, a receiving circuit used for receiving reflected light and converting the reflected light into first electric signals, an electric signal processing circuit used for filtering and amplifying the first electric signals and obtaining second electric signals, and a microprocessor used for identifying effective signals in the second electric signals and judging the liquid temperature. The transmitting circuit is connected with the microprocessor, and the receiving circuit, the electric signal processing circuit and the microprocessor are sequentially connected. The principle that foams or fluctuations can be generated on the liquid level along with the temperature changes is utilized, whether the liquid temperature reaches the target temperature or not is judged by detecting the reflected light irradiated to the liquid level, the control over the liquid temperature is achieved under the condition that a sensor does not need to make contact with the liquid to be detected, the requirement of some special occasions is effectively met, and the manufacturing cost is lowered.
Description
Technical field
The present invention relates to temperature detection field, particularly relate to fluid temperature detection system and detection method thereof.
Background technology
Substantially serviceability temperature signal is all needed to realize the control to heating liquid temperature as control signal in existing liquid heater.And general temperature signal obtain manner all requires that sensor must input with liquid comes into contact or with liquid surface signal as temperature controlled signal, sensor needs to contact with testing liquid, and said temperature detection method cannot use or need higher manufacturing cost in some special occasion.
Therefore, prior art need development.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide fluid temperature detection system and detection method thereof, be intended to solve in prior art the problem obtaining fluid temperature signal demand sensor and contact with testing liquid.
In order to achieve the above object, this invention takes following technical scheme:
A kind of fluid temperature detection system, it comprises: for the radiating circuit of emission of light, for receiving reflected light and being converted into the receiving circuit of the first electric signal, for carrying out filtering to described first electric signal and amplifying process, obtain the electric signal processing circuit of the second electric signal, and for identifying useful signal in described second electric signal and judging the microprocessor of fluid temperature; Described radiating circuit is connected with microprocessor, and described receiving circuit connects microprocessor by electric signal processing circuit.
In described fluid temperature detection system, described microprocessor, also for controlling the open and close of described radiating circuit and receiving circuit.
In described fluid temperature detection system, described electric signal processing circuit specifically comprises, the first filter and amplification unit of the electric signal of 5Hz is less than for amplifying also rejection frequency, and being greater than the second filter and amplification unit of the electric signal of 40Hz for amplifying also rejection frequency, described receiving circuit, the first filter and amplification unit, the second filter and amplification unit, microprocessor connect successively.
In described fluid temperature detection system, in the cycle that described useful signal is specially two seconds, length is greater than the broad pulse of 1000mS or two length and is greater than the broad pulse that the broad pulse of 500mS or more than 3 length is greater than 100mS.
In described fluid temperature detection system, described transmitter circuit specifically comprises the first triode, second triode, first electric capacity, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, polar capacitor, the light emitting diode of voltage stabilizing diode and several parallel connections, the emitter of the first triode is connected with power supply, the base stage of the first triode is connected with power supply by the first resistance, also be connected with the collector of the second triode by the second resistance, the base stage of described second triode is connected with one end of microprocessor and the 4th resistance by the 3rd resistance, the other end of the 4th resistance and the grounded emitter of the second triode, the collector of the first triode connects the negative pole of voltage stabilizing diode by the 5th resistance, the positive pole of light emitting diode, the positive pole of polar capacitor and one end of the first electric capacity, the negative pole of voltage stabilizing diode, the negative pole of light emitting diode, the negative pole of polar capacitor and the equal ground connection of the other end of the first electric capacity.
In described fluid temperature detection system, described receiving circuit comprises the 3rd triode, 4th triode, second electric capacity, 3rd electric capacity, second voltage stabilizing diode, phototriode, 6th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance and the 11 resistance, the emitter of described 3rd triode connects power supply, the base stage of the 3rd triode connects power supply by the 6th resistance, the collector of the 4th triode is also connected by the 7th resistance, the collector of the 3rd triode connects one end of the second electric capacity, one end of the 3rd electric capacity by the 8th resistance, the negative pole of voltage stabilizing diode, and the collector of phototriode, the base stage of described 4th triode is connected with one end of the 9th resistance, and the other end of the 9th resistance is connected with microprocessor, also by the tenth resistance eutral grounding, and the emitter of the 4th triode, the other end of the second electric capacity, the other end of the 3rd electric capacity and the equal ground connection of negative pole of voltage stabilizing diode, the emitter of phototriode is by the 11 resistance eutral grounding, and the collector and emitter of phototriode is also connected with electric signal processing circuit.
In described fluid temperature detection system, described 3rd triode is PNP triode, and the 4th triode is NPN triode.
In described fluid temperature detection system, described first filter and amplification unit specifically comprises: the 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, 8th electric capacity, first operational amplifier, 12 resistance, 13 resistance, 14 resistance, 15 resistance, 16 resistance, 17 resistance, 18 resistance, 19 resistance, one end of described 4th electric capacity connects the emitter of phototriode, also connect one end of the 14 resistance and one end of the 5th electric capacity by the 13 resistance, the other end of described 14 resistance connects one end of the 15 resistance and one end of the 16 resistance by the 7th electric capacity, the other end of the 4th electric capacity, the other end of the 5th electric capacity, the equal ground connection of the other end of the 16 resistance, the other end of described 15 resistance connects the in-phase input end of the first operational amplifier, also the collector of phototriode is connected by the 12 resistance, also by the 6th capacity earth, the inverting input of the first operational amplifier connects one end of the 18 resistance by the 17 resistance, the other end of the 18 resistance connects the output terminal of the first operational amplifier, the output terminal of the first operational amplifier connects one end and the second filter and amplification unit of the 19 resistance, the other end ground connection of the 19 resistance by the 8th electric capacity.
In described fluid temperature detection system, described second filter and amplification unit specifically comprises: the 9th electric capacity, tenth electric capacity, second operational amplifier, 20 resistance, 21 resistance, 22 resistance, 23 resistance, 24 resistance, the in-phase input end of described second operational amplifier passes through the 20 resistance successively, 8th electric capacity connects the output terminal of the first operational amplifier, the inverting input of the second operational amplifier is by the 21 resistance eutral grounding, also be connected with the output terminal of the second operational amplifier by the 22 resistance, the output terminal of described second operational amplifier is connected with one end of the 23 resistance, the other end of the 23 resistance is connected with microprocessor, also by the 24 resistance, tenth capacity earth.
Use a detection method for above-mentioned fluid temperature detection system, it comprises:
A, by the liquid level emission of light of radiating circuit to testing liquid;
B, receiving circuit receive the reflected light of testing liquid liquid level reflection and are converted into the first electric signal;
C, electronic signal processing module carry out filtering to the first electric signal and after amplifying process, produce the second electric signal and output to microprocessor;
Useful signal in D, microprocessor identification second electric signal also judges the temperature of testing liquid.
Beneficial effect: fluid temperature detection system provided by the invention and detection method thereof, utilize liquid level can vary with temperature the principle producing foam or fluctuation, the judgement of target temperature is realized whether reaching fluid temperature by detecting the reflected light being irradiated to liquid level, do not need at sensor the control that achieves when contact measured liquid fluid temperature, effectively adapted to the requirement of some special occasions and reduced manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the fluid temperature detection system in the specific embodiment of the invention.
Fig. 2 is the circuit theory diagrams of the radiating circuit of fluid temperature detection system in the specific embodiment of the invention.
Fig. 3 is the circuit theory diagrams of the receiving circuit of fluid temperature detection system in the specific embodiment of the invention.
Fig. 4 is the circuit theory diagrams of the first filter and amplification unit of fluid temperature detection system in the specific embodiment of the invention.
Fig. 5 is the circuit theory diagrams of the second filter and amplification unit of fluid temperature detection system in the specific embodiment of the invention.
Fig. 6 is the microprocessor of fluid temperature detection system in the specific embodiment of the invention and the circuit theory diagrams of topworks.
Fig. 7 is the circuit theory diagrams of the power supply of fluid temperature detection system in the specific embodiment of the invention.
Fig. 8 is the method flow diagram of the fluid temperature detection method in the specific embodiment of the invention.
Embodiment
The invention provides fluid temperature detection system and detection method thereof.For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the specific embodiment of fluid temperature detection system of the present invention.Described detection system comprises: for the radiating circuit 100 of emission of light, for receiving reflected light and being converted into the receiving circuit 200 of the first electric signal, for carrying out filtering to described first electric signal and amplifying process, obtain the electric signal processing circuit 300 of the second electric signal, and for identifying useful signal in described second electric signal and judging the microprocessor 400 of fluid temperature.Described system can also comprise when judging that fluid temperature reaches certain value, performs some specific operation, such as, stop the topworks 500 of heating.
Described radiating circuit is connected with microprocessor, described receiving circuit, electric signal processing circuit, microprocessor, and topworks 500 connects successively.
The specific works principle of described detection system is as follows: some surface tension are comparatively large, and such as coffee, milk, wheaten food liquid have a large amount of foams or bubble generation in the moment of temperature rising or boiling, and strong vaporization occurs.And when these liquid are in lower temperature, as under the effect of rocking without the external world etc., its liquid level is relatively placidity and static plane.Therefore, there is certain correlationship between the temperature of liquid and the peace of liquid level, can as the foundation of qualitative detection.
Radiating circuit 100 emission of light, the at a certain angle liquid level of directive testing liquid, receiving circuit 200 receives the reflected light of liquid level and is converted into electric signal.As mentioned above, when liquid level be one remain static plane time reflected light and liquid level there is strong springing up, and reflected light when producing a large amount of foam has visibly different light characteristic.(can think be equivalent to bubble surface do the displacement movement rotated relative to sensor)
Described reflected light is converted into the transfer functions of electric signal can simply by following function representation:
V= K1*E0+K2*E(ω)
Wherein, V is the voltage after light signal is converted to electric signal, and K1, K2 are opto-electronic conversion constant (arranging decision by physical circuit), and E0 is the voltage that opto-electronic conversion is arrived in static reflex, E is the dynamic component of opto-electronic conversion, and ω is the angular velocity of reflected light relative sensors movement.
After processing module 300 pairs of electric signal carry out certain process, such as filtering or amplification process, electric signal is outputted in microprocessor 400, useful signal in this electric signal of microprocessor identification, and judge whether it reaches default designated value, what judge liquid level springs up situation, and and then judges whether the temperature of liquid reaches predetermined condition, such as boiling etc.
Described default designated value can pass through repeatedly trial test, and the electric signal feature such as detected in advance under same liquid fluidized state is determined, its concrete test method is prior art, and it will not go into details.
Microprocessor 400 can export execution instruction after judging the designated value that this electric signal reaches default, controls topworks 500 and performs some operation, completed the correlation function of liquid heating apparatus.Concrete, as shown in Figure 1, described topworks can also comprise an output unit 600.When temperature arrives target temperature, export control signal by microprocessor, after output unit 600 receives signal, control topworks 500 and perform the action (as stopped heating) preset.Output unit 600 can be relay, also can with other power devices such as controllable silicon etc., and topworks 500 can be heating wire switch, also can be motor, solenoid valve, other similar devices such as electromagnet.
Certainly, described system can also use a power supply, and described power supply can adopt the direct current of any suitable type, AC power etc.
Preferably, as shown in Figure 1, microprocessor 400 is connected with radiating circuit 100 and receiving circuit 200, and start and closed condition for controlling it, when needing to carry out temperature detection, just control radiating circuit 100 and receiving circuit 200 are opened to lengthen the serviceable life of components and parts and saved power supply.
In one of them specific embodiment of the present invention, above-mentioned radiating circuit 100 with fixed frequency F1 emission of light, the liquid level of directive testing liquid.If liquid is in lower temperature, liquid level be a level and static plane time, reflected light after amplifying process with the phase place of original frequency F1 by identical, there is no phase differential between the two.When liquid level springs up or gas foam produces, due to the instability of bubble, can cause radiative fluctuation, reflected light will produce difference through amplifying with the phase place of original frequency F1.Microprocessor 400 by identifying that the useful signal of corresponding this reflective phase of reflection in electric signal judges whether reflective phase change reaches default degree, thus can determine the temperature whether this testing liquid reaches default.
More particularly, described electric signal processing circuit 200 specifically comprises, and is less than 5Hz and the first filter and amplification unit 301 of amplification signal and be greater than 40Hz for rejection frequency and the second filter and amplification unit 302 of amplification signal for rejection frequency.
Described receiving circuit, the first filter and amplification unit, the second filter and amplification unit, microprocessor connects successively.
In general, when liquid fluctuating, the frequency of reflected light is between 5-40Hz, by first and second filter and amplification unit above-mentioned can effectively get rid of liquid level do not spring up time, the signal being less than about 5Hz after opto-electronic conversion, and the interference source of system self or the undesired signal of external light source.This filter and amplification unit is amplified by two-stage signal, is amplified to by the ultra-weak electronic signal of conversion and can identifies for microprocessor 400, the electric signal of use.In another specific embodiment of the present invention, described useful signal can be that in cycle of two seconds, length is greater than the broad pulse of 1000mS or two length and is greater than the broad pulse that the broad pulse of 500mS or more than 3 length is greater than 100mS.When microprocessor 400 recognize in electric signal there is above-mentioned useful signal time, judge according to it temperature whether liquid reaches default, and control topworks 500 and perform concrete operations.
It should be noted that in the specific embodiment of the invention that the mode giving the judgement of use phase place and broad pulse judgement realizes the judgement to fluid temperature indirectly.System of the present invention can also adopt other to utilize reflected light tracer liquid liquid level state, the mode of indirect detection fluid temperature, the frequency displacement etc. of such as reflected light.
More particularly, as shown in Figure 2, described transmitter circuit specifically comprises the first triode Q1, the second triode Q2, first electric capacity C1, first resistance R1, the second resistance R2, the 3rd resistance R3,4th resistance R4,5th resistance R5, polar capacitor C`, the light emitting diode D of the first voltage stabilizing diode ZD1 and several parallel connections.The emitter of the first triode Q1 is connected with 12V power supply, the base stage of the first triode Q1 is connected with 12V power supply by the first resistance R1, also be connected with the collector of the second triode Q2 by the second resistance R2, the base stage of described second triode Q2 is connected with one end of microprocessor 400 and the 4th resistance R4 by the 3rd resistance R3, the other end of the 4th resistance R4 and the grounded emitter of the second triode Q2, the collector of the first triode Q1 connects the negative pole of voltage stabilizing diode ZD1 by the 5th resistance R5, the positive pole of light emitting diode D, the positive pole of polar capacitor C and one end of the first electric capacity C1, the negative pole of voltage stabilizing diode ZD1, the negative pole of light emitting diode D, the negative pole of polar capacitor and the equal ground connection of the other end of the first electric capacity C1.The number of described light emitting diode can be determined according to actual operating conditions, generally can be set to 3, certainly, other emitting components also can be adopted to produce other dissimilar light sources.
As shown in Figure 3, described receiving circuit specifically comprises the 3rd triode Q3, the 4th triode Q4, the second electric capacity C2,3rd electric capacity C3, second voltage stabilizing diode ZD2, phototriode SEN, the 6th resistance R6,7th resistance R7,8th resistance R8, the 9th resistance R9, the tenth resistance R10 and the 11 resistance R11.The emitter of described 3rd triode Q3 connects power supply, base stage connects 12V power supply by the 6th resistance R6, the collector of the 4th triode Q4 is also connected by the 7th resistance R7, the collector of the 3rd triode Q3 connects one end of the second electric capacity C2 by the 8th resistance R8, one end of 3rd electric capacity C3, the negative pole of voltage stabilizing diode ZD2, and the collector of phototriode SEN, the base stage of described 4th triode Q4 is connected with one end of the 9th resistance R9, the other end of the 9th resistance R9 is connected with microprocessor 400, also by the tenth resistance R10 ground connection, the emitter of the 4th triode Q4, the other end of the second electric capacity C2, the other end of the 3rd electric capacity C3 and the equal ground connection of negative pole of voltage stabilizing diode ZD2, the emitter of phototriode SEN is by the 11 resistance R11 ground connection, the collector and emitter of phototriode SEN is also connected with electric signal processing circuit 300.In the present embodiment, described receiving circuit employs phototriode as photo-electric conversion element, but the photosensitive device of other types also can be used to realize the conversion of light signal to electric signal.
Wherein, described first triode and the 3rd triode are PNP triode, and the second triode and the 4th triode are NPN triode.Certainly, in other embodiments, each triode also can use the on-off circuit of respective type (on-off circuit that triode and phase inverter as metal-oxide-semiconductor or corresponding polarity are formed) to replace, and the present invention is restricted this.
As shown in Figure 4, described first filter and amplification unit specifically comprises: the 4th electric capacity C4, the 5th electric capacity C5,6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, first operational amplifier U01A, the 12 resistance R12, the 13 resistance R13,14 resistance R14,15 resistance R15, the 16 resistance R16, the 17 resistance R17,18 resistance R18, the 19 resistance R19.One end of described 4th electric capacity C4 connects the emitter of phototriode SEN, also connect one end of the 14 resistance R14 and one end of the 5th electric capacity C5 by the 13 resistance E13, the other end of described 14 resistance R14 connects one end of the 15 resistance R15 and one end of the 16 resistance R16 by the 7th electric capacity C7, the other end of the 4th electric capacity C4, the other end of the 5th electric capacity C5, the equal ground connection of the other end of the 16 resistance R16, the other end of described 15 resistance R15 connects the in-phase input end of the first operational amplifier U01A, also the collector of phototriode SEN is connected by the 12 resistance R12, also by the 6th electric capacity C6 ground connection, the inverting input of the first operational amplifier U01A connects one end of the 18 resistance R18 by the 17 resistance R17, the other end of the 18 resistance R18 connects the output terminal of the first operational amplifier U01A, the output terminal of the first operational amplifier U01A connects one end and the second filter and amplification unit of the 19 resistance R19 by the 8th electric capacity C8, the other end ground connection of the 19 resistance R19.Wherein, the 7th electric capacity C7 and the 16 resistance R16, and the 8th electric capacity C8 and the 19 resistance R19 constitutes Hi-pass filter, may be used for the low frequency electrical number of below filtering 5Hz.
As shown in Figure 5, described second filter and amplification unit specifically comprises: the 9th electric capacity C9, the tenth electric capacity C10, second operational amplifier U01B, the 19 resistance R20, the 21 resistance R21,22 resistance R22, the 23 resistance R23, the 24 resistance R24.The in-phase input end of described second operational amplifier U01B passes through the 19 resistance R20 successively, 8th electric capacity C8 connects the output terminal of the first operational amplifier U01A, the inverting input of the second operational amplifier U01B is by the 21 resistance R21 ground connection, also be connected with the output terminal of the second operational amplifier U01B by the 22 resistance R22, the output terminal of described second operational amplifier U01B is connected with one end of the 23 resistance R23, the other end of the 23 resistance R23 is connected with microprocessor 400, also by the 24 resistance R24, tenth electric capacity C10 ground connection.Wherein, the 19 resistance R20 and the 9th electric capacity C9 and the 23 resistance R23 and the tenth electric capacity C10 forms low-pass filter, may be used for the high frequency electrical signal that filtering is greater than 40Hz.
Refer to 1 and Fig. 6, the PB3 of microprocessor holds the other end of connection the 23 resistance R23, the PB2 of microprocessor holds the other end of connection the 9th resistance R9, and the PA2/AN2 end of microprocessor connects the base stage of the second triode Q2 by the 3rd resistance, and the PA7 end of microprocessor connects topworks.After system heating a period of time, hold output high level to make the second triode Q2, the first triode Q1 conducting by the PA2/AN2 of microprocessor 400, make the just very high level of light emitting diode D, make light emitting diode D continuous illumination.Simultaneously, the PB2 end of microprocessor 400, export high level and make the 4th triode Q4, second triode Q2 conducting, the collector power taking of phototriode SEN is enable to receive the light of the transmitting of light emitting diode D, thus generation voltage signal, this voltage signal carries out after high-pass filtering amplification process through the first filter and amplification unit, enter in the second filter and amplification unit and carry out low-pass filtering amplification process, send into the PB3 end of microprocessor 400 again, judge that whether Received signal strength is effective by microprocessor 400, effective then stopping topworks working, invalid Ze Shi topworks continuous firing.
Please continue to refer to Fig. 6, described topworks 600 comprises diode D1, relay K 01, battery BAT, 5th triode Q5, 25 resistance R25 and heating wire E1, the base stage of described 5th triode Q5 connects the PA7 end of microprocessor by the 25 resistance R25, the collector of the 5th triode Q5 connects 12V power supply by the coil of relay K 01, the grounded emitter of the 5th triode Q5, the negative pole of described diode D1 connects 12V power supply, the positive pole of diode D1 connects the collector of the 5th triode Q5, one end of the normally opened contact of relay K 01 connects the positive pole of battery BAT, the other end of the normally opened contact of relay K 01 connects the negative pole of battery BAT by heating wire E1.When normal heating, the PA7 end of microprocessor exports high level makes the 5th triode Q5 conducting, makes relay K 01 adhesive, makes heating wire continuous heating.When microprocessor judges fluid temperature reaches requirement, the PA7 of microprocessor holds output low level that the 5th triode Q5 is ended, and relay K 01 is disconnected, and makes heating wire stop heating.
Refer to 7, fluid temperature detection system of the present invention also comprises power supply provides 12V voltage and 5V power supply to radiating circuit, receiving circuit, electric signal processing circuit and microprocessor power supply, it comprises power module U1, step-down chip U2, fuse F1, voltage dependent resistor (VDR) ZNR1, the LIN end of power module U1 connects attaching plug by fuse F1, the NIN end of power module U1 connects attaching plug, + 12V the end of power module U1 connects radiating circuit, receiving circuit, the Vin end of electric signal processing circuit and step-down chip U2, the Vout end of step-down chip U2 connects the vdd terminal of microprocessor.One end of voltage dependent resistor (VDR) ZNR1 connects the LIN end of power module U1, and the other end of voltage dependent resistor (VDR) ZNR1 connects the NIN end of power module U1, and when line voltage is abnormal, fuse F1 and voltage dependent resistor (VDR) ZNR1 plays protection power source.
In addition, the present invention also provides a kind of method using said detecting system tracer liquid temperature.As shown in Figure 6, described method comprises the steps:
S100, radiating circuit are to the liquid level emission of light of testing liquid.
S200, receiving circuit receive the reflected light of testing liquid liquid level reflection and are converted into the first electric signal.
S300, electronic signal processing module carry out filtering to the first electric signal and after amplifying process, produce the second electric signal and output to microprocessor.
Useful signal in S400, microprocessor identification second electric signal also judges the temperature of testing liquid.
In sum, fluid temperature detection system provided by the invention and detection method thereof, utilize liquid level can vary with temperature the principle producing foam or fluctuation, the judgement of target temperature is realized whether reaching fluid temperature by detecting the reflected light being irradiated to liquid level, do not need at sensor the control that achieves when contact measured liquid fluid temperature, effectively adapted to the requirement of some special occasions and reduced manufacturing cost.And said detecting system versatility is good, can also be applied in other control system and exports as auxiliary control signal.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and the present invention's design and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (10)
1. a fluid temperature detection system, it is characterized in that, comprise: for the radiating circuit of emission of light, for receiving reflected light and being converted into the receiving circuit of the first electric signal, for carrying out filtering to described first electric signal and amplifying process, obtain the electric signal processing circuit of the second electric signal, and for identifying useful signal in described second electric signal and judging the microprocessor of fluid temperature; Described radiating circuit is connected with microprocessor, and described receiving circuit connects microprocessor by electric signal processing circuit.
2. fluid temperature detection system according to claim 1, is characterized in that, described microprocessor, also for controlling the open and close of described radiating circuit and receiving circuit.
3. fluid temperature detection system according to claim 1, it is characterized in that, described electric signal processing circuit specifically comprises, the first filter and amplification unit of the electric signal of 5Hz is less than for amplifying also rejection frequency, and being greater than the second filter and amplification unit of the electric signal of 40Hz for amplifying also rejection frequency, described receiving circuit, the first filter and amplification unit, the second filter and amplification unit, microprocessor connect successively.
4. fluid temperature detection system according to claim 3, it is characterized in that, in the cycle that described useful signal is specially two seconds, length is greater than the broad pulse of 1000mS or two length and is greater than the broad pulse that the broad pulse of 500mS or more than 3 length is greater than 100mS.
5. fluid temperature detection system according to claim 3, it is characterized in that, described transmitter circuit specifically comprises the first triode, second triode, first electric capacity, first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, polar capacitor, the light emitting diode of voltage stabilizing diode and several parallel connections, the emitter of the first triode is connected with power supply, the base stage of the first triode is connected with power supply by the first resistance, also be connected with the collector of the second triode by the second resistance, the base stage of described second triode is connected with one end of microprocessor and the 4th resistance by the 3rd resistance, the other end of the 4th resistance and the grounded emitter of the second triode, the collector of the first triode connects the negative pole of voltage stabilizing diode by the 5th resistance, the positive pole of light emitting diode, the positive pole of polar capacitor and one end of the first electric capacity, the negative pole of voltage stabilizing diode, the negative pole of light emitting diode, the negative pole of polar capacitor and the equal ground connection of the other end of the first electric capacity.
6. fluid temperature detection system according to claim 5, is characterized in that, described receiving circuit comprises the 3rd triode, 4th triode, second electric capacity, 3rd electric capacity, second voltage stabilizing diode, phototriode, 6th resistance, 7th resistance, 8th resistance, 9th resistance, tenth resistance and the 11 resistance, the emitter of described 3rd triode connects power supply, the base stage of the 3rd triode connects power supply by the 6th resistance, the collector of the 4th triode is also connected by the 7th resistance, the collector of the 3rd triode connects one end of the second electric capacity, one end of the 3rd electric capacity by the 8th resistance, the negative pole of voltage stabilizing diode, and the collector of phototriode, the base stage of described 4th triode is connected with one end of the 9th resistance, and the other end of the 9th resistance is connected with microprocessor, also by the tenth resistance eutral grounding, and the emitter of the 4th triode, the other end of the second electric capacity, the other end of the 3rd electric capacity and the equal ground connection of negative pole of voltage stabilizing diode, the emitter of phototriode is by the 11 resistance eutral grounding, and the collector and emitter of phototriode is also connected with electric signal processing circuit.
7. fluid temperature detection system according to claim 5, is characterized in that, described 3rd triode is PNP triode, and the 4th triode is NPN triode.
8. fluid temperature detection system according to claim 6, is characterized in that, described first filter and amplification unit specifically comprises: the 4th electric capacity, 5th electric capacity, 6th electric capacity, 7th electric capacity, 8th electric capacity, first operational amplifier, 12 resistance, 13 resistance, 14 resistance, 15 resistance, 16 resistance, 17 resistance, 18 resistance, 19 resistance, one end of described 4th electric capacity connects the emitter of phototriode, also connect one end of the 14 resistance and one end of the 5th electric capacity by the 13 resistance, the other end of described 14 resistance connects one end of the 15 resistance and one end of the 16 resistance by the 7th electric capacity, the other end of the 4th electric capacity, the other end of the 5th electric capacity, the equal ground connection of the other end of the 16 resistance, the other end of described 15 resistance connects the in-phase input end of the first operational amplifier, also the collector of phototriode is connected by the 12 resistance, also by the 6th capacity earth, the inverting input of the first operational amplifier connects one end of the 18 resistance by the 17 resistance, the other end of the 18 resistance connects the output terminal of the first operational amplifier, the output terminal of the first operational amplifier connects one end and the second filter and amplification unit of the 19 resistance, the other end ground connection of the 19 resistance by the 8th electric capacity.
9. fluid temperature detection system according to claim 8, it is characterized in that, described second filter and amplification unit specifically comprises: the 9th electric capacity, tenth electric capacity, second operational amplifier, 20 resistance, 21 resistance, 22 resistance, 23 resistance, 24 resistance, the in-phase input end of described second operational amplifier passes through the 20 resistance successively, 8th electric capacity connects the output terminal of the first operational amplifier, the inverting input of the second operational amplifier is by the 21 resistance eutral grounding, also be connected with the output terminal of the second operational amplifier by the 22 resistance, the output terminal of described second operational amplifier is connected with one end of the 23 resistance, the other end of the 23 resistance is connected with microprocessor, also by the 24 resistance, tenth capacity earth.
10. use a detection method for fluid temperature detection system as claimed in claim 1, it is characterized in that, comprising:
A, by the liquid level emission of light of radiating circuit to testing liquid;
B, receiving circuit receive the reflected light of testing liquid liquid level reflection and are converted into the first electric signal;
C, electronic signal processing module carry out filtering to the first electric signal and after amplifying process, produce the second electric signal and output to microprocessor;
Useful signal in D, microprocessor identification second electric signal also judges the temperature of testing liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410800594.4A CN104535219B (en) | 2014-12-22 | 2014-12-22 | Fluid temperature detecting system and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410800594.4A CN104535219B (en) | 2014-12-22 | 2014-12-22 | Fluid temperature detecting system and its detection method |
Publications (2)
| Publication Number | Publication Date |
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| CN104535219A true CN104535219A (en) | 2015-04-22 |
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| CN105098931A (en) * | 2015-09-22 | 2015-11-25 | 广西职业技术学院 | Laptop battery protection circuit |
| CN109839020A (en) * | 2017-11-28 | 2019-06-04 | 李明守 | A kind of mechanical filter |
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| CN104535219B (en) | 2017-07-04 |
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