CN204495429U - A kind of detecting liquid level system - Google Patents
A kind of detecting liquid level system Download PDFInfo
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- CN204495429U CN204495429U CN201520042461.5U CN201520042461U CN204495429U CN 204495429 U CN204495429 U CN 204495429U CN 201520042461 U CN201520042461 U CN 201520042461U CN 204495429 U CN204495429 U CN 204495429U
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Abstract
The utility model relates to Detection Techniques field, especially a kind of detecting liquid level system.It comprises sampling needle, vibration/frequency dividing circuit, phaselocked loop/filtering circuit, amplifying circuit, comparator circuit and pulse-recognition circuit; Sampling needle is collected liquid depth signal and signal is inputed to phaselocked loop/filtering circuit, phaselocked loop/filtering circuit converts the signal of input to stable error voltage signal and inputs to amplifying circuit, signal carries out amplifying and the signal after amplifying is inputed to comparator circuit by amplifying circuit, and signal compares and the signal is relatively inputed to pulse-recognition circuit by comparator circuit; Vibration/frequency dividing circuit produces frequency signal and frequency signal is inputed to comparator circuit successively after phaselocked loop/filtering circuit and amplifying circuit.The utility model adopts contact capacitance method, by sampling needle as acquisition sensor, overcomes the defect of conventional contact electric-resistivity method, reaches the object improving analyser functional reliability and accuracy of detection.
Description
Technical field
The utility model relates to Detection Techniques field, especially a kind of detecting liquid level system.
Background technology
As everyone knows, detecting liquid level system is the requisite Core Feature assemblies of the full-automatic testing instruments of clinical medicine, it probes into the degree of depth of liquid to be transferred by controlling sampling needle, thus farthest solves the problem that instrument cross pollution is high and loading errors is large because sampling needle outside surface attaching liq causes.At present, detecting liquid level system ubiquity detection sensitivity is high and cause the misoperation such as " suction " and " striker ".
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of can the detecting liquid level system of detected with high accuracy liquid depth signal.
To achieve these goals, the utility model adopts following technical scheme:
A kind of detecting liquid level system, it comprises sampling needle, vibration/frequency dividing circuit, phaselocked loop/filtering circuit, amplifying circuit, comparator circuit and pulse-recognition circuit;
Described sampling needle is collected liquid depth signal and signal is inputed to phaselocked loop/filtering circuit, described phaselocked loop/filtering circuit converts the signal of input to stable error voltage signal and inputs to amplifying circuit, signal carries out amplifying and the signal after amplifying is inputed to comparator circuit by described amplifying circuit, and signal compares and the signal is relatively inputed to pulse-recognition circuit by described comparator circuit;
Described vibration/frequency dividing circuit produces frequency signal and frequency signal is inputed to comparator circuit successively after phaselocked loop/filtering circuit and amplifying circuit.
Preferably, described vibration/frequency dividing circuit comprises quartz oscillator and frequency divider; The XO of described quartz oscillator holds pin to hold pin to be connected by the second resistance with the CLK-NI of frequency divider, the NC of described quartz body oscillator holds pin to hold pin to be connected by the first resistance with the VCC of frequency divider, the RST of described frequency divider holds pin by the 3rd resistance eutral grounding, and the Q3 of described frequency divider holds pin to be connected with the input end of phaselocked loop/filtering circuit.
Preferably, described phaselocked loop/filtering circuit comprises CD4040 chip, 14 end pin of described CD4040 chip are connected with the output terminal of vibration/frequency dividing circuit, 6 end pin of described CD4040 chip are connected with sampling needle by the 4th electric capacity and are connected with the 7 end pin of self by the 4th electric capacity, ten four resistance of 5 end pin by connecting successively of described CD4040 chip, 11 resistance, adjustable resistance is connected with the 12 end pin of self with 12 resistance, 10 end pin of described CD4040 chip and 13 end pin are parallel with the 17 resistance and the 6th electric capacity of connecting successively, 13 end pin of described CD4040 chip are connected with the 19 resistance of connecting successively by the 18 resistance, 7th electric capacity and the 20 resistance, 9 end pin of described CD4040 chip are connected with the 18 resistance and the 8th electric capacity and pass through the 8th electric capacity simultaneously and are connected with amplifying circuit, described 8th electric capacity is also connected with the 20 resistance.
Preferably, described amplifying circuit and comparator circuit comprise operational amplifier and comparer, the in-phase end of described operational amplifier is connected with the output terminal of phaselocked loop/filtering circuit and passes through the 3rd electric capacity of connecting successively and the 7th resistance is connected with the output terminal of self, be connected with the end of oppisite phase of operational amplifier by the 5th resistance between described 3rd electric capacity and the 7th resistance, by the 6th resistance eutral grounding, the end of oppisite phase of described operational amplifier is logical is parallel with the second electric capacity with output terminal, the output terminal of described operational amplifier is connected with the in-phase end of comparer by the 8th resistance, the output terminal of described comparer is connected with the input end of pulse-recognition circuit.
Owing to have employed such scheme, the utility model is by adopting contact capacitance method, using strong insulated metal double-jacket tube sampling needle as acquisition sensor, and combine based on the capacitive detection circuit of phaselocked loop phase comparator and the utilization of self-adaptation effective impulse recognizer, overcome the defect of conventional contact electric-resistivity method, reach the object improving analyser functional reliability and accuracy of detection, the whole medical treatment diagnostic level of the domestic small towns of raising, community's basic hospital is had important practical significance.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of the utility model embodiment;
Fig. 2 is the vibration of the utility model embodiment and the electrical block diagram of frequency dividing circuit;
Fig. 3 is the phaselocked loop of the utility model embodiment and the electrical block diagram of filtering circuit;
Fig. 4 is the amplifying circuit of the utility model embodiment and the electrical block diagram of comparator circuit.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, a kind of detecting liquid level system, it comprises sampling needle 1, vibration/frequency dividing circuit 6, phaselocked loop/filtering circuit 2, amplifying circuit 3, comparator circuit 4 and pulse-recognition circuit 5; Sampling needle 1 is collected liquid depth signal and signal is inputed to phaselocked loop/filtering circuit 2, phaselocked loop/filtering circuit 2 converts the signal of input to stable error voltage signal and inputs to amplifying circuit 3, signal carries out amplifying and the signal after amplifying is inputed to comparator circuit 4 by amplifying circuit 3, and signal compares and the signal is relatively inputed to pulse-recognition circuit 5 by comparator circuit 4; Vibration/frequency dividing circuit 6 produces frequency signal and frequency signal is inputed to comparator circuit 4 successively after phaselocked loop/filtering circuit 2 and amplifying circuit 3.The utility model is by adopting contact capacitance method, using strong insulated metal double-jacket tube sampling needle 1 as acquisition sensor, and combine based on the capacitive detection circuit of phaselocked loop phase comparator and the utilization of self-adaptation effective impulse recognizer, overcome the defect of conventional contact electric-resistivity method, reach the object improving analyser functional reliability and accuracy of detection, the whole medical treatment diagnostic level of the domestic small towns of raising, community's basic hospital is had important practical significance.
Meanwhile, the vibration/frequency dividing circuit 6 of the present embodiment can adopt circuit structure as shown in Figure 2, namely comprises quartz oscillator U1 and frequency divider U2; The XO of quartz oscillator U1 holds pin to hold pin to be connected by the second resistance R2 with the CLK-NI of frequency divider U2, the NC of quartz body oscillator U1 holds pin to hold pin to be connected by the first resistance R1 with the VCC of frequency divider U2, the RST of frequency divider U2 holds pin by the 3rd resistance R3 ground connection, and the Q3 of frequency divider U2 holds pin to be connected with the input end of phaselocked loop/filtering circuit 2.The vibration of the present embodiment and the effect of frequency dividing circuit 6 mainly provide the input signal of phaselocked loop phase comparator, and it is as the benchmark of whole phaselocked loop phase comparator; The wherein quartz oscillator U1 FC 1 type quartz crystal oscillator of selecting manufacturer TXC to produce, its oscillation frequency is 6.0MHz; The CD4024BCM type frequency divider that frequency divider U2 selects Tl company of the U.S. to produce, after frequency division, the frequency of output signal is 1.5MHz.
For realizing the characteristic that phase place automatic synchronization controls, phaselocked loop/the filtering circuit 2 of the present embodiment can adopt the circuit structure shown in Fig. 3, namely CD4040 chip U5 is comprised, the 14 end pin of CD4040 chip U5 are connected with the output terminal of vibration/frequency dividing circuit 6, the 6 end pin of CD4040 chip U5 are connected with sampling needle by the 4th electric capacity C4 and are connected with the 7 end pin of self by the 4th electric capacity C4, the ten four resistance R14s of 5 end pin by connecting successively of CD4040 chip U5, 11 resistance R11, adjustable resistance RW is connected with the 12 end pin of self with 12 resistance R12, the 10 end pin of CD4040 chip U5 and 13 end pin are parallel with the 17 resistance R17 and the 6th electric capacity C6 that connect successively, the 13 end pin of CD4040 chip U5 are connected with the 19 resistance R19 connected successively by the 18 resistance R18, 7th electric capacity C7 and the 20 resistance R20, the 9 end pin of CD4040 chip U5 are connected with the 18 resistance R18 and the 8th electric capacity C8 simultaneously and are connected with amplifying circuit 3 by the 8th electric capacity C8, 8th electric capacity C8 is also connected with the 20 resistance R20.Described phaselocked loop/filtering circuit 2 is system core circuit, capacitance variation when sampling needle being contacted liquid level by phaselocked loop inner integrated phase comparator and the phase place change that causes are converted to an error voltage and export, then form a stable voltage signal afterwards after filtering.
In addition, the amplifying circuit 3 of the present embodiment and comparator circuit 4 can adopt circuit structure as shown in Figure 4, namely operational amplifier U3 and comparer U4 is comprised, the in-phase end of operational amplifier U3 is connected with the output terminal of phaselocked loop/filtering circuit 2 and passes through the 3rd electric capacity C3 that connects successively and the 7th resistance R7 and is connected with the output terminal of self, be connected with the end of oppisite phase of operational amplifier U3 by the 5th resistance R5 between 3rd electric capacity C3 and the 7th resistance R7, by the 6th resistance R6 ground connection, the end of oppisite phase of operational amplifier U3 is logical is parallel with the second electric capacity C2 with output terminal, the output terminal of operational amplifier U3 is connected with the in-phase end of comparer U4 by the 8th resistance R8, the output terminal of comparer U4 is connected with the input end of pulse-recognition circuit 5.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. a detecting liquid level system, is characterized in that: it comprises sampling needle, vibration/frequency dividing circuit, phaselocked loop/filtering circuit, amplifying circuit, comparator circuit and pulse-recognition circuit;
Described sampling needle is collected liquid depth signal and signal is inputed to phaselocked loop/filtering circuit, described phaselocked loop/filtering circuit converts the signal of input to stable error voltage signal and inputs to amplifying circuit, signal carries out amplifying and the signal after amplifying is inputed to comparator circuit by described amplifying circuit, and signal compares and the signal is relatively inputed to pulse-recognition circuit by described comparator circuit;
Described vibration/frequency dividing circuit produces frequency signal and frequency signal is inputed to comparator circuit successively after phaselocked loop/filtering circuit and amplifying circuit.
2. a kind of detecting liquid level system as claimed in claim 1, is characterized in that: described vibration/frequency dividing circuit comprises quartz oscillator and frequency divider; The XO of described quartz oscillator holds pin to hold pin to be connected by the second resistance with the CLK-NI of frequency divider, the NC of described quartz oscillator holds pin to hold pin to be connected by the first resistance with the VCC of frequency divider, the RST of described frequency divider holds pin by the 3rd resistance eutral grounding, and the Q3 of described frequency divider holds pin to be connected with the input end of phaselocked loop/filtering circuit.
3. a kind of detecting liquid level system as claimed in claim 2, it is characterized in that: described phaselocked loop/filtering circuit comprises CD4040 chip, 14 end pin of described CD4040 chip are connected with the output terminal of vibration/frequency dividing circuit, 6 end pin of described CD4040 chip are connected with sampling needle by the 4th electric capacity and are connected with the 7 end pin of self by the 4th electric capacity, ten four resistance of 5 end pin by connecting successively of described CD4040 chip, 11 resistance, adjustable resistance is connected with the 12 end pin of self with 12 resistance, 10 end pin of described CD4040 chip and 13 end pin are parallel with the 17 resistance and the 6th electric capacity of connecting successively, 13 end pin of described CD4040 chip are connected with the 19 resistance of connecting successively by the 18 resistance, 7th electric capacity and the 20 resistance, 9 end pin of described CD4040 chip are connected with the 18 resistance and the 8th electric capacity and pass through the 8th electric capacity simultaneously and are connected with amplifying circuit, described 8th electric capacity is also connected with the 20 resistance.
4. a kind of detecting liquid level system as claimed in claim 3, it is characterized in that: described amplifying circuit and comparator circuit comprise operational amplifier and comparer, the in-phase end of described operational amplifier is connected with the output terminal of phaselocked loop/filtering circuit and passes through the 3rd electric capacity of connecting successively and the 7th resistance is connected with the output terminal of self, be connected with the end of oppisite phase of operational amplifier by the 5th resistance between described 3rd electric capacity and the 7th resistance, by the 6th resistance eutral grounding, the end of oppisite phase of described operational amplifier is logical is parallel with the second electric capacity with output terminal, the output terminal of described operational amplifier is connected with the in-phase end of comparer by the 8th resistance, the output terminal of described comparer is connected with the input end of pulse-recognition circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042461.5U CN204495429U (en) | 2015-01-21 | 2015-01-21 | A kind of detecting liquid level system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520042461.5U CN204495429U (en) | 2015-01-21 | 2015-01-21 | A kind of detecting liquid level system |
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| CN204495429U true CN204495429U (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520042461.5U Expired - Fee Related CN204495429U (en) | 2015-01-21 | 2015-01-21 | A kind of detecting liquid level system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109792961A (en) * | 2019-01-23 | 2019-05-24 | 深圳市智信农联科技有限公司 | A kind of channel devices and monitoring method |
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
-
2015
- 2015-01-21 CN CN201520042461.5U patent/CN204495429U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111380916A (en) * | 2018-12-29 | 2020-07-07 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN111380916B (en) * | 2018-12-29 | 2023-09-15 | 深圳市帝迈生物技术有限公司 | Liquid level detection device and liquid level detection method |
| CN109792961A (en) * | 2019-01-23 | 2019-05-24 | 深圳市智信农联科技有限公司 | A kind of channel devices and monitoring method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150722 Termination date: 20160121 |
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| EXPY | Termination of patent right or utility model |