CN203672344U - Apparatus for measuring the length of pipe - Google Patents
Apparatus for measuring the length of pipe Download PDFInfo
- Publication number
- CN203672344U CN203672344U CN201420051955.5U CN201420051955U CN203672344U CN 203672344 U CN203672344 U CN 203672344U CN 201420051955 U CN201420051955 U CN 201420051955U CN 203672344 U CN203672344 U CN 203672344U
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- signal
- circuit
- sine wave
- chip microcomputer
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Abstract
The utility model provides an apparatus for measuring the length of a pipe, relates to the field of pipe length measurement. A signal generating circuit comprises a direct digital frequency synthesizer and a low-pass filter which are connected, and is used for generating a standard sine wave signal. A signal transmission circuit comprises a connected power amplifier and a loudspeaker which are connected. A signal detection circuit comprises a sound pickup, an amplifier and an A/D converter which are connected in sequence, and is used for receiving a superposition signal formed by the signal fed back by a detected pipe and the sending signal generated by the signal transmission circuit. A signal processing display circuit comprises a connected single chip and a display which are connected. The device utilizes the direct digital frequency synthesizer to produce sine wave signals and has the advantages of high frequency precision in outputting the sine wave signals, wide frequency range in outputting the sine wave signals, small frequency resolution in outputting the sine wave signals and the like. The smaller resolution and higher precision make the measured standing wave frequency more accurate, thereby the measuring result is more accurate.
Description
Technical field
The utility model relates to duct length fields of measurement, relates in particular to a kind of device of measuring channel length.
Background technology
Pipeline in city is very many, also very long now, is in complicated pipe network, and wherein the measurement of duct length is a difficult problem of dimensional measurement.At present also have the research that carrys out measuring channel length based on laser, ultrasound wave, but laser manufacturing cost is high, high to measure field environmental requirement; Hyperacoustic frequency is high, wavelength is short, easily decay, only limit to short-range measurement, and measuring accuracy is not high.The utility model utilizes sound wave in pipeline, to form standing wave, finds two adjacent standing wave Frequency points by adjusting frequency of sound wave, then calculates duct length.
Utility model content
The technical problems to be solved in the utility model is: a kind of device of measuring channel length is provided, can effectively solves the low problem of existing measurement mechanism measuring accuracy.
To achieve these goals, the technical solution adopted in the utility model is: a kind of device of measuring channel length, comprise signal generating circuit, signal sending circuit, signal deteching circuit and signal processes and displays circuit,
Signal generating circuit, is made up of the Direct Digital Synthesizer being connected and low-pass filter, for generation of standard sine wave signal, and standard sine wave signal is passed through to signal processes and displays circuit transmission to signal sending circuit;
Signal sending circuit, is made up of the power amplifier being connected and loudspeaker, and the signal that signal generating circuit is produced sends in tested pipeline after amplifying;
Signal deteching circuit, formed by the acoustic pickup connecting successively, amplifier and A/D converter, be used for receiving superposed signal, the transmitted signal that the signal that described superposed signal is fed back by tested pipeline and signal sending circuit produce forms, and convert superposed signal to digital signal, be sent to signal processes and displays circuit;
Signal processes and displays circuit, is made up of the single-chip microcomputer being connected and display, and single-chip microcomputer is processed and flowed to display by the digital signal after signal deteching circuit conversion and shows;
Described single-chip microcomputer is connected with Direct Digital Synthesizer, low-pass filter, power amplifier and loudspeaker successively; Acoustic pickup, amplifier and A/D converter are connected successively with single-chip microcomputer.
Described single-chip microcomputer is also connected with the digital temperature sensor for measuring the residing environment temperature of tested pipeline.
Described display is LCD display.
The model of the chip of described Direct Digital Synthesizer is AD9850.
The beneficial effect that the utility model brings is:
On allomeric function, this device not only can be measured straight tube pipe range, also can measure bend pipe pipe range.Install simple to operately, volume is little easily to be carried, and is convenient to carry out operation in various outdoor environments.
In structural design, this device uses Direct Digital Synthesizer (DDS principle) to produce sine wave signal, and therefore system has the advantages such as sine wave output signal frequency precision is high, sine wave output signal frequency range large, sine wave output signal frequency resolution is little.Less resolution and higher precision can make the standing wave frequency measured more accurate, thereby make measurement result more accurate.Larger frequency range can improve the measurement range of system.It is digital temperature sensor that this device also has a temperature measurement unit, for the temperature of measuring channel environment of living in, according to the different of temperature and then can compensate the velocity of sound, has further improved measuring accuracy.
Brief description of the drawings
Fig. 1 is that the circuit of the utility model embodiment connects block diagram;
Fig. 2 is the circuit theory diagrams of Direct Digital Synthesizer;
Fig. 3 is the circuit theory diagrams of display;
Fig. 4 is the circuit theory diagrams of button;
Fig. 5 is the circuit theory diagrams of digital temperature sensor;
Fig. 6 is the circuit theory diagrams of low-pass filter;
Fig. 7 is the circuit theory diagrams of power amplifier and loudspeaker;
Fig. 8 is the circuit theory diagrams of single-chip microcomputer and A/D converter;
Fig. 9 is the circuit theory diagrams of amplifier and acoustic pickup.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in the figure, a kind of device of measuring channel length, comprises signal generating circuit, signal sending circuit, signal deteching circuit and signal processes and displays circuit,
Signal generating circuit, is made up of the Direct Digital Synthesizer being connected and low-pass filter, for generation of standard sine wave signal, and standard sine wave signal is passed through to signal processes and displays circuit transmission to signal sending circuit;
Signal sending circuit, is made up of the power amplifier being connected and loudspeaker, and the signal that signal generating circuit is produced sends in tested pipeline after amplifying;
Signal deteching circuit, formed by the acoustic pickup connecting successively, amplifier and A/D converter, be used for receiving superposed signal, the transmitted signal that the signal that described superposed signal is fed back by tested pipeline and signal sending circuit produce forms, and convert superposed signal to digital signal, be sent to signal processes and displays circuit;
Signal processes and displays circuit, is made up of the single-chip microcomputer being connected and display, and single-chip microcomputer is processed and flowed to display by the digital signal after signal deteching circuit conversion and shows;
Described single-chip microcomputer is connected with Direct Digital Synthesizer, low-pass filter, power amplifier and loudspeaker successively; Acoustic pickup, amplifier and A/D converter are connected successively with single-chip microcomputer.
Described single-chip microcomputer is also connected with the digital temperature sensor for measuring the residing environment temperature of tested pipeline.
Described display is LCD display.
The model of the chip of described Direct Digital Synthesizer is AD9850.
Direct Digital Synthesizer (DDS) and low-pass filter composition digital sine signal generator.User makes single-chip microcomputer (MCU) start one-shot measurement by button, and Single-chip Controlling Direct Digital Synthesizer produces the digitized sine wave signal of assigned frequency, and digitized sine wave signal produces the standard sine wave signal of assigned frequency again through low-pass filter.Standard sine wave signal is sent into and in loudspeaker, is produced sinusoidal acoustic signals after power amplifier amplifies, acoustic signals superposes with transmitted signal after tested pipeline feedback, acoustic pickup detects after superposed signal, convert thereof into electric signal, electric signal amplifies through amplifier again, send into A/D converter and convert digital signal to and send into single-chip microcomputer, judge whether to produce standing wave by single-chip microcomputer processing.Single-chip microcomputer finds two adjacent standing wave Frequency points by adjusting frequency of sound wave, then calculates duct length, sends in display and shows.In native system, be also connected with digital temperature sensor, system can be corrected the velocity of sound according to ambient temperature value, thereby has improved measuring accuracy.
According to forming and stablize the relation that standing wave is frequency and pipe range in original pipeline, while releasing stopped pipe, the relation formula of frequency and pipe range is:
,
be the difference of adjacent stable standing wave frequency,
for the velocity of sound.When pipeline tapping
,
(when edge is large);
(edge hour),
for the diameter of the mouth of pipe.
Claims (4)
1. a device for measuring channel length, is characterized in that: comprise signal generating circuit, signal sending circuit, signal deteching circuit and signal processes and displays circuit,
Signal generating circuit, is made up of the Direct Digital Synthesizer being connected and low-pass filter, for generation of standard sine wave signal, and standard sine wave signal is passed through to signal processes and displays circuit transmission to signal sending circuit;
Signal sending circuit, is made up of the power amplifier being connected and loudspeaker, and the signal that signal generating circuit is produced sends in tested pipeline after amplifying;
Signal deteching circuit, formed by the acoustic pickup connecting successively, amplifier and A/D converter, be used for receiving superposed signal, the transmitted signal that the signal that described superposed signal is fed back by tested pipeline and signal sending circuit produce forms, and convert superposed signal to digital signal, be sent to signal processes and displays circuit;
Signal processes and displays circuit, is made up of the single-chip microcomputer being connected and display, and single-chip microcomputer is processed and flowed to display by the digital signal after signal deteching circuit conversion and shows;
Described single-chip microcomputer is connected with Direct Digital Synthesizer, low-pass filter, power amplifier and loudspeaker successively; Acoustic pickup, amplifier and A/D converter are connected successively with single-chip microcomputer.
2. the device of a kind of measuring channel length as claimed in claim 1, is characterized in that: described single-chip microcomputer is also connected with the digital temperature sensor for measuring the residing environment temperature of tested pipeline.
3. the device of a kind of measuring channel length as claimed in claim 1, is characterized in that: described display is LCD display.
4. the device of a kind of measuring channel length as claimed in claim 1, is characterized in that: the model of the chip of described Direct Digital Synthesizer is AD9850.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420051955.5U CN203672344U (en) | 2014-01-27 | 2014-01-27 | Apparatus for measuring the length of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420051955.5U CN203672344U (en) | 2014-01-27 | 2014-01-27 | Apparatus for measuring the length of pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203672344U true CN203672344U (en) | 2014-06-25 |
Family
ID=50968630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420051955.5U Expired - Fee Related CN203672344U (en) | 2014-01-27 | 2014-01-27 | Apparatus for measuring the length of pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203672344U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791865A (en) * | 2014-01-27 | 2014-05-14 | 河南科技大学 | Device for measuring length of pipeline |
-
2014
- 2014-01-27 CN CN201420051955.5U patent/CN203672344U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791865A (en) * | 2014-01-27 | 2014-05-14 | 河南科技大学 | Device for measuring length of pipeline |
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Legal Events
| 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: 20140625 Termination date: 20180127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |