CN202103632U - Intelligent ultrasonic signal filtering circuit - Google Patents
Intelligent ultrasonic signal filtering circuit Download PDFInfo
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- CN202103632U CN202103632U CN2011201380635U CN201120138063U CN202103632U CN 202103632 U CN202103632 U CN 202103632U CN 2011201380635 U CN2011201380635 U CN 2011201380635U CN 201120138063 U CN201120138063 U CN 201120138063U CN 202103632 U CN202103632 U CN 202103632U
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Abstract
An intelligent ultrasonic signal filtering circuit relates to an improved filtering circuit of an ultrasonic sending and receiving circuit and is suitable for large-flow ultrasonic gas flow meters, liquid concentration meters, and gas composition analyzers. The intelligent ultrasonic signal filtering circuit comprises an adjustable integrated filter, a digital potentiometer matrix, an MCU (Microprogrammed Control Unit) controller, and a frequency and phase detection circuit. The intelligent ultrasonic signal filtering circuit can acquire ultrasonic frequency in real time through receiving ultrasonic signals, so as to modify the resistance value of the digital potentiometer matrix and the center frequency linear setting on line and realize the self-adaptive function through adjusting the center frequency and the Q value in real time according to the change of the actual ultrasonic frequency. The intelligent ultrasonic signal filtering circuit is convenient to manufacture and use, can be widely applied to all meters measuring through the ultrasonic, and can effectively improve the intelligent degree of the measuring meters, as well as the measuring stability, reliability, and accuracy.
Description
Technical field
Ultrasonic signal intelligent filter circuit relates to the improvement of filter circuit in the ultrasonic emitting receiving circuit, is applicable to high-flow ultrasonic ripple gas flowmeter, strength of fluid meter, the gas component analyzer.
Background technology
In the existing various ultrasonic measurement instruments, the filter circuit that ultrasonic wave receives signal adopts fixed center frequency and Q value filtering circuit mostly, perhaps adopts the condenser type integrated digital filter of FREQUENCY CONTROL.The characteristics of fixed center frequency and Q value filtering circuit can only the filtering fixed frequency noise, and fixing Q value can not design too high, generally be no more than 3, otherwise can cause circuit oscillation.The characteristics of condenser type integrated digital filter are, have with the MCU control unit interface simple, characteristics such as the software implementation algorithm is simple; But its deficiency is; The variation of centre frequency is non-linear, and along with the rising of centre frequency, centre frequency changes step pitch can be increasing; The Q value is along with the rising Q value of centre frequency becomes more and more littler, finally smaller or equal to 1.
For example; In the application of ultrasonic gas flowmeter; Because the complexity and the diversity of actual application environment; All can constantly affect the precision and the operation stability of ultrasonic gas flowmeter from the common mode disturbances of power-supply system, the self-noise of ultrasonic transmit circuit, the whistler that gas flow is brought etc.; Simultaneously because the differentiation of ultrasonic gas flowmeter supersonic transducer frequency, caused the filter circuit of fixed frequency, Q value to be difficult to the application need of the modern intelligent ultrasonics gas flowmeter of adaptation.
Summary of the invention
Deficiency to present ultrasonic signal filter circuit; The inventor is through studying for a long period of time; Design a kind of production and easy to use, can receive the frequency of signal automatically according to ultrasonic echo, the ultrasonic signal intelligent filter circuit of adjustment filter center frequency and Q value.
The utility model intelligent filter circuit mainly is made up of adjustable integrated filter, digital regulation resistance matrix, MCU controller, frequency and phase detecting circuit; Adjustable integrated filter is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively, and the MCU controller is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively.Adjustable integrated filter is the adjustable integrated filter of the continuous resistance of high-order.
Adjustable integrated filter received ultrasonic signal; The MCU controller is gathered ultrasonic frequency in real time; Calculate the resistance of each resistance in the digital regulation resistance matrix then according to ultrasonic wave actual frequency and predefined Q value; Last resistance, and then the online adjustment of realization filter circuit by each resistance of MCU controller online modification digital regulation resistance matrix.The adjustable integrated filter chip of filter circuit and digital regulation resistance chip matrix adopt the potentiometer chip matrix, and maximum resistance is 50K Ω, and the resolution of potentiometer is 256 gears; Can realize the resistance resolution of minimum 196 Ω; The centre frequency linearisation is provided with, and frequency is adjustable continuously in 25KHz～250KHz scope, and minimum resolution is 1KHz; The Q value is adjustable continuously in 0.2～10 scope, and minimum resolution is 0.1.
The use of the adjustable integrated filter of the continuous resistance of digital regulation resistance matrix and high-order, having changed centre frequency in the digital filter circuit in the past, to change step pitch non-linear and along with the drawback of the increasingly high Q value of centre frequency more and more littler (finally equaling 1).The use of frequency and phase detecting circuit has realized that filter center frequency and Q value can adjust adaptive ability according to ultrasonic echo signal actual frequency.
The utility model intelligent filter circuit production and easy to use, the Adaptive Anti-jamming ability is strong, through the centre frequency linearisation is provided with; Feasible accurate to the filter center FREQUENCY CONTROL, good wave filtering effect, antijamming capability is strong; Applied widely, intelligent degree is high, can be widely used on the ultrasonic flowmeter; Be applicable to that also strength of fluid is measured, the gas component analyzer, can effectively improve stability, reliability and the accuracy of detection.
Description of drawings
Institute's accompanying drawing is the embodiment of the utility model,
Fig. 1. the utility model circuit diagram.
Embodiment
The utility model intelligent filter circuit mainly is made up of adjustable integrated filter, digital regulation resistance matrix, MCU controller, frequency and phase detecting circuit.Adjustable integrated filter adopts the adjustable integrated filter of the continuous resistance of high-order.Adjustable integrated filter received ultrasonic signal is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively, and the MCU controller is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively.The adjustable integrated filter chip of filter circuit and digital regulation resistance chip matrix adopt the potentiometer chip matrix, and maximum resistance is 50K Ω, and the resolution of potentiometer is 256 gears, realizes the resistance resolution of minimum 196 Ω.
During the utility model intelligent filter circuit working, adjustable integrated filter received ultrasonic signal, the MCU controller is gathered the frequency of ultrasonic signal; According to the ultrasonic wave actual frequency that receives, calculate the centre frequency and the Q value that need band pass filter then, calculate the resistance filtering parameter according to centre frequency and Q value again; Be set to the resistance parameter adjusted value in the digital regulation resistance matrix at last, the centre frequency linearisation is provided with, and realizes that frequency is adjustable continuously in 25KHz～250KHz scope; Minimum resolution is 1KHz; In the centre frequency scope, the Q value is adjustable continuously in 0.2～10 scope, and minimum resolution is 0.1; Fundamentally solve some interference noises that occur usually, can effectively improve ultrasonic measurement stability, reliability and accuracy.
Claims (2)
1. ultrasonic signal intelligent filter circuit; Be made up of adjustable integrated filter, digital regulation resistance matrix, MCU controller, frequency and phase detecting circuit, it is characterized in that: adjustable integrated filter is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively, and the MCU controller is connected with digital regulation resistance matrix, frequency and phase detecting circuit respectively; The centre frequency linearisation is provided with; Frequency is adjustable continuously in 25KHz～250KHz scope, and minimum resolution is 1KHz, in the centre frequency scope; The Q value is adjustable continuously in 0.2～10 scope, and minimum resolution is 0.1.
2. intelligent filter circuit according to claim 1; It is characterized in that: adjustable integrated filter chip and digital regulation resistance chip matrix adopt the potentiometer chip matrix; Maximum resistance is 50K Ω, and the resolution of potentiometer is 256 gears, and minimum resistance resolution is 196 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201380635U CN202103632U (en) | 2011-05-04 | 2011-05-04 | Intelligent ultrasonic signal filtering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201380635U CN202103632U (en) | 2011-05-04 | 2011-05-04 | Intelligent ultrasonic signal filtering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202103632U true CN202103632U (en) | 2012-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201380635U Expired - Fee Related CN202103632U (en) | 2011-05-04 | 2011-05-04 | Intelligent ultrasonic signal filtering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202103632U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975433A (en) * | 2019-04-11 | 2019-07-05 | 苏芯物联技术(南京)有限公司 | A kind of dynamic and configurable band pass filter means and method for acoustic emission signal |
| CN112350687A (en) * | 2020-10-29 | 2021-02-09 | 天津飞旋科技有限公司 | Hardware filtering device, method and system |
-
2011
- 2011-05-04 CN CN2011201380635U patent/CN202103632U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975433A (en) * | 2019-04-11 | 2019-07-05 | 苏芯物联技术(南京)有限公司 | A kind of dynamic and configurable band pass filter means and method for acoustic emission signal |
| CN112350687A (en) * | 2020-10-29 | 2021-02-09 | 天津飞旋科技有限公司 | Hardware filtering device, method and system |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120104 Termination date: 20170504 |
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| CF01 | Termination of patent right due to non-payment of annual fee |