CN201974154U - Vibrating string type strain measurement device - Google Patents
Vibrating string type strain measurement device Download PDFInfo
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- CN201974154U CN201974154U CN2010206402157U CN201020640215U CN201974154U CN 201974154 U CN201974154 U CN 201974154U CN 2010206402157 U CN2010206402157 U CN 2010206402157U CN 201020640215 U CN201020640215 U CN 201020640215U CN 201974154 U CN201974154 U CN 201974154U
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- vibrating string
- string type
- measurement mechanism
- strain measurement
- type strain
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Abstract
The utility model provides a vibrating string type strain measurement device, mainly comprising: a central processing unit (CPU), a vibrating string exciter and an echo receiver. The CPU emits a set of variable repeated square wave to the vibrating string exciter according to the central frequency of a vibrating string sensor, and calculates the echo period according to the echo signal received from the echo receiver to obtain the resonance frequency of the vibrating string of the vibrating string strain sensor; the vibrating string exciter shapes and isolates the received variable repeated square wave to form the exciting current and transmits the exciting current to the vibrating string strain sensor; the echo receiver can receive the echo signal outputted by the vibrating string strain sensor, and the received echo signal is reduced noise, filtered, amplified and shaped and is sent to the CPU. Using the above vibrating string type strain measurement device, people can carry out an accurate frequency measurement to the vibrating string sensor.
Description
Technical field
The utility model relates to construction work detection technique field, refers in particular to a kind of vibrating string type strain measurement mechanism.
Background technology
When measuring that large-sized concrete or steel member are long-term to be used the small strain that is produced or measure behavior of members under loading under the various load actions, need to use strain transducer and corresponding measuring technique thereof to measure accordingly usually.In general, present employed strain transducer generally can be three classes: resistance strain sensor, vibratory string strain transducer and fibre optic strain sensor.Wherein, the vibratory string strain transducer is with plurality of advantages such as its good stability, reliability height, environmental suitability be strong and be widely used in some Important Project, as engineering fields such as nuclear power plant containment shell, colliery roadway, bridges, therefore, with the corresponding measuring technique of above-mentioned vibratory string strain transducer also development thereupon constantly.
In practical situations, the general surface of all the vibratory string strain transducer being imbedded in advance among the large-sized concrete structure to be measured or being installed in member to be measured.In above-mentioned vibratory string strain sensing, be provided with the vibratory string with magnetic (for example, having the string wire of magnetic) that two ends are fixed on the described vibratory string strain sensing and are in tensioning state, also be provided with one or two solenoid.Wherein, when only having a solenoid in the vibratory string strain sensing, this solenoid can be arranged near the mid point of vibratory string and be very near from vibratory string.When applying the exciting current of different frequency, varying strength for above-mentioned solenoid, this solenoid will produce the excitation field of a variation, thereby make vibratory string produce resonance with its resonant frequency.After the vibratory string starting of oscillation, remove exciting current, vibratory string continues vibration; When vibration takes place vibratory string, the magnetic flux in this solenoid will change, and then cause that the electric current in the solenoid changes.Corresponding to the different vibration frequency of vibratory string, the frequency that electric current changes in the solenoid is also different with the size of intensity.According to mechanics principle as can be known, the resonant frequency of vibratory string is relevant with tension force or pulling force that vibratory string is born, and tension force that vibratory string bore or pulling force are relevant with pressure or the displacement that the vibratory string strain transducer is born, therefore, can change the resonant frequency that records above-mentioned vibratory string by the electric current of measuring in the solenoid, thereby can know that member to be measured uses or small strain that load action produced because of long-term, and then can assess all sidedly aspects such as the quality of this member to be measured, safety.
Therefore, on the surface that above-mentioned vibratory string strain transducer is installed in member to be measured or inner, can use the vibrating string type strain measurement mechanism that the vibratory string in the above-mentioned vibratory string strain transducer is encouraged, measure the resonant frequency of above-mentioned vibratory string then, thereby obtain treating the related physical quantity in the geodesic structure.But, present employed vibrating string type strain measurement mechanism mostly is from the equipment of offshore company's import, the vibratory string strain transducer that these equipment design at the said firm is mostly specially voluntarily developed, and be not suitable for other vibratory string strain transducer, therefore versatility is not strong, testing the electric magnetization pattern of going to, otherwise the excitation of mistake often causes lost wrong output toward selecting correspondence according to the type of the vibratory string strain transducer that is detected.In addition, present employed vibrating string type strain measurement mechanism toward contact have that volume is big, Heavy Weight, cost height, power consumption are big, complicated operation, lack audio frequency output and qualitatively judge shortcomings such as vibratory string.
The utility model content
The utility model provides a kind of vibrating string type strain measurement mechanism, thereby can carry out frequency measurement exactly to vibrating wire sensor.
For achieving the above object, the technical scheme in the utility model is achieved in that
A kind of vibrating string type strain measurement mechanism comprises: central processing unit, vibratory string driver and echo receiver;
Described central processing unit sends one group of variable repetition square wave according to the centre frequency of vibrating string type sensor to described vibratory string driver; Echoed signal according to receiving from described echo receiver calculates the echo cycle, obtains the resonant frequency of the vibratory string in the described vibratory string strain transducer;
Described vibratory string driver carries out shaping and isolates the amplification back forming exciting current to received variable repetition square wave, and this exciting current is transferred to the vibratory string strain transducer;
Described echo receiver receives the echoed signal of vibratory string strain transducer output, received echoed signal is carried out noise reduction, filtering, amplification and shaping after, send to central processing unit.
Described vibrating string type strain measurement mechanism also comprises: audio output unit;
Described echo receiver will send to described audio output unit through the echoed signal after noise reduction, filtering, amplification and the shaping;
Described audio output unit converts received echoed signal to corresponding sound signal and output.
Described audio output unit is a loudspeaker.
Described vibrating string type strain measurement mechanism also comprises: constant current source and analog to digital converter;
Described constant current source, the temperature sensor in described vibrating string type sensor is imported a steady current, and according to the electric current of the described temperature sensor of flowing through that is received, to the voltage of described analog to digital converter output analog signal form;
Described analog to digital converter, the voltage transitions that described constant current source is exported becomes the voltage of digital signal form and sends to described central processing unit;
Described central processing unit calculates the temperature of vibrating string type sensor environment of living in according to the voltage of the digital signal form after the described conversion.
Described vibrating string type strain measurement mechanism also comprises:
Be used for to current date of described central processing unit input, the time reference unit of time parameter.
Described vibrating string type strain measurement mechanism also comprises: the low-voltage detecting unit;
Described low-voltage detecting unit detects the voltage of vibrating string type strain measurement mechanism, and when the voltage of vibrating string type strain measurement mechanism is lower than preset threshold value, sends the low-voltage cue to described central processing unit.
Described vibrating string type strain measurement mechanism also comprises: unit automatically shuts down;
Described vibrating string type strain measurement mechanism when described vibrating string type strain measurement mechanism meets predefined cut-off condition, is closed automatically in described automatic shutdown unit.
Described vibrating string type strain measurement mechanism also comprises: the display that is used to receive and show the data that central processing unit is exported.
Described vibrating string type strain measurement mechanism also comprises: the short-circuit protection unit that is used for described vibrating string type strain measurement mechanism is carried out short-circuit protection.
In summary, provide a kind of vibrating string type strain measurement mechanism in the utility model.In described vibrating string type strain measurement mechanism, mainly comprise: central processing unit, vibratory string driver and echo receiver, thus can carry out frequency measurement accurately to vibrating wire sensor.
Description of drawings
Fig. 1 is the structural representation of the vibrating string type strain measurement mechanism in the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage express clearlyer, the utility model is further described in more detail below in conjunction with drawings and the specific embodiments.
The utility model provides a kind of vibrating string type strain measurement mechanism, in this vibrating string type strain measurement mechanism, mainly comprises: central processing unit, vibratory string driver and echo receiver, thus can carry out frequency measurement accurately to vibrating wire sensor.
Fig. 1 is the structural representation of the vibrating string type strain measurement mechanism in the utility model.As shown in Figure 1, in the vibrating string type strain measurement mechanism 100 in the utility model, mainly comprise: central processing unit 101, vibratory string driver 102 and echo receiver 103.Wherein:
Described central processing unit 101, the centre frequency (be vibrating string type sensor when not being subjected to external force, the resonant frequency of the vibratory string in this vibrating string type sensor) that is used for according to vibrating string type sensor 120 is sent one group of variable repetition square wave to described vibratory string driver 102; According to the echoed signal that receives from described echo receiver 103, calculate the echo cycle accurately, obtain the resonant frequency and the output of the vibratory string in the vibratory string strain transducer 120;
Described vibratory string driver 102, be used for received variable repetition square wave is carried out shaping and isolate the amplification back forming exciting current, and this exciting current is transferred to be installed in treats among the geodesic structure or the vibratory string strain transducer 120 on surface, with the solenoid in the excitation vibratory string strain transducer 120;
Described echo receiver 103 is used to receive the echoed signal of vibratory string strain transducer 120 outputs, received echoed signal is carried out noise reduction, filtering, amplification and shaping after, send to central processing unit 101.
Further, in above-mentioned vibrating string type strain measurement mechanism, also can comprise a display 104, this display 104 is used to receive and show the data that central processing unit 101 is exported.
In above-mentioned vibrating string type strain measurement mechanism, also can comprise an audio output unit 105; At this moment:
Described echo receiver 103 also is used for and will sends to described audio output unit 105 through the echoed signal after noise reduction, filtering, amplification and the shaping;
Described audio output unit 105 is used for converting received echoed signal to corresponding sound signal and output.
In embodiment of the present utility model, described audio output unit 105 can be a loudspeaker.Because the resonant frequency of the vibratory string in the vibrating string type sensor is generally all in the voice frequency scope (within 300～3000Hz), therefore, the echoed signal after above-mentioned process noise reduction, filtering, amplification and the shaping can be used as sound signal directly from described audio output unit output.So the staff can in time judge the characteristic of vibratory string qualitatively according to the acoustic characteristic of echoed signal, for example, when vibratory string was tight, then echoed signal was generally high pitch; When vibratory string relaxed, then echoed signal was generally bass.
In addition, owing to generally also have temperature sensor 121 in the vibrating string type sensor 120, and this temperature sensor 121 is generally the negative thermistor with log characteristic, and the resistance of this temperature sensor 121 will change along with variation of temperature.Therefore, in embodiment of the present utility model, also can comprise constant current source 106 and modulus (A/D) converter 107 in the described vibrating string type strain measurement mechanism, thereby can record the temperature value of vibrating string type sensor 120 environment of living in by said temperature sensor 121.Wherein:
Described constant current source 106 is used for temperature sensor 121 input one steady current to described vibrating string type sensor 120, and according to the electric current of the described temperature sensor 121 of flowing through that is received, to described A/D converter 107 output voltages; Wherein, the voltage exported of constant current source 106 is generally the magnitude of voltage of analog signal form.
Described A/D converter 107 is used for the voltage transitions of described constant current source 106 outputs is become the voltage of digital signal form and sends to described central processing unit 101;
Described central processing unit 101 also can be used for the temperature according to voltage calculating vibrating string type sensor 120 environment of living in of the digital signal form after the described conversion.
Specifically, central processing unit can calculate the temperature value of vibrating string type sensor environment of living in according to formula as described below:
Wherein, T is the temperature value of vibrating string type sensor environment of living in, unit be degree centigrade (℃), R is the resistance of temperature sensor, this resistance R can calculate according to the voltage that constant current source is exported learn that concrete computing method do not repeat them here; A, B, C are and the corresponding calculating parameter of described temperature sensor (calculating effectively in-50～150 ℃ of scopes).Wherein, in embodiment of the present utility model, A=1.4051 * 10
-3, B=2.369 * 10
-4, C=1.019 * 10
-7
Further, in embodiment of the present utility model, also can comprise a time reference unit 108 in the described vibrating string type strain measurement mechanism, be used for to current date, the time parameter of described central processing unit 101 inputs, thereby be convenient to execute-in-place and record.
Further, in embodiment of the present utility model, also can comprise a low-voltage detecting unit 109 in the described vibrating string type strain measurement mechanism, be used for the voltage of vibrating string type strain measurement mechanism is detected, and when the voltage of vibrating string type strain measurement mechanism is lower than preset threshold value, send the low-voltage cue to described central processing unit 101, the prompting user in time charges to the vibrating string type strain measurement mechanism.
Further, in embodiment of the present utility model, also can comprise a shutdown unit 110 automatically in the described vibrating string type strain measurement mechanism, be used for when described vibrating string type strain measurement mechanism meets predefined cut-off condition, automatically close described vibrating string type strain measurement mechanism, thereby save the electric weight of the battery of described vibrating string type strain measurement mechanism.Wherein, above-mentioned cut-off condition can be preestablished according to its actual conditions by the user, and concrete setting means does not repeat them here.
Further, in embodiment of the present utility model, also can comprise a short-circuit protection unit (not shown among Fig. 2) in the described vibrating string type strain measurement mechanism, be used for described vibrating string type strain measurement mechanism is carried out short-circuit protection.
In summary, above-mentioned vibrating string type strain measurement mechanism has been proposed in embodiment of the present utility model.In above-mentioned vibrating string type strain measurement mechanism, owing to have central processing unit, vibratory string driver and echo receiver, thus to realize vibrating wire sensor is carried out frequency measurement exactly, its measuring accuracy can reach 0.1%; And above-mentioned vibrating string type strain measurement mechanism has also that measurement range is wide, volume is little, in light weight, cost is low, power consumption is little, simple to operate, the advantages such as characteristic that can qualitatively judge vibratory string by audio frequency output.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within the scope of the utility model protection.
Claims (9)
1. a vibrating string type strain measurement mechanism is characterized in that, this vibrating string type strain measurement mechanism comprises: central processing unit, vibratory string driver and echo receiver;
Described central processing unit sends one group of variable repetition square wave according to the centre frequency of vibrating string type sensor to described vibratory string driver; Echoed signal according to receiving from described echo receiver calculates the echo cycle, obtains the resonant frequency of the vibratory string in the described vibratory string strain transducer;
Described vibratory string driver carries out shaping and isolates the amplification back forming exciting current to received variable repetition square wave, and this exciting current is transferred to the vibratory string strain transducer;
Described echo receiver receives the echoed signal of vibratory string strain transducer output, received echoed signal is carried out noise reduction, filtering, amplification and shaping after, send to central processing unit.
2. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises: audio output unit;
Described echo receiver will send to described audio output unit through the echoed signal after noise reduction, filtering, amplification and the shaping;
Described audio output unit converts received echoed signal to corresponding sound signal and output.
3. vibrating string type strain measurement mechanism according to claim 2 is characterized in that:
Described audio output unit is a loudspeaker.
4. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises: constant current source and analog to digital converter;
Described constant current source, the temperature sensor in described vibrating string type sensor is imported a steady current, and according to the electric current of the described temperature sensor of flowing through that is received, to the voltage of described analog to digital converter output analog signal form;
Described analog to digital converter, the voltage transitions that described constant current source is exported becomes the voltage of digital signal form and sends to described central processing unit;
Described central processing unit calculates the temperature of vibrating string type sensor environment of living in according to the voltage of the digital signal form after the described conversion.
5. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises:
Be used for to current date of described central processing unit input, the time reference unit of time parameter.
6. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises: the low-voltage detecting unit;
Described low-voltage detecting unit detects the voltage of vibrating string type strain measurement mechanism, and when the voltage of vibrating string type strain measurement mechanism is lower than preset threshold value, sends the low-voltage cue to described central processing unit.
7. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises: unit automatically shuts down;
Described vibrating string type strain measurement mechanism when described vibrating string type strain measurement mechanism meets predefined cut-off condition, is closed automatically in described automatic shutdown unit.
8. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises:
Be used to receive and show the display of the data that central processing unit is exported.
9. vibrating string type strain measurement mechanism according to claim 1 is characterized in that, described vibrating string type strain measurement mechanism also comprises:
Be used for described vibrating string type strain measurement mechanism is carried out the short-circuit protection unit of short-circuit protection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206402157U CN201974154U (en) | 2010-12-03 | 2010-12-03 | Vibrating string type strain measurement device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206402157U CN201974154U (en) | 2010-12-03 | 2010-12-03 | Vibrating string type strain measurement device |
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| CN201974154U true CN201974154U (en) | 2011-09-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426052A (en) * | 2011-09-16 | 2012-04-25 | 重庆恩菲斯软件有限公司 | Vibration wire type data acquisition system and method |
| CN109580085A (en) * | 2018-10-17 | 2019-04-05 | 广州中海达定位技术有限公司 | A kind of antinoise measurement method, electronic equipment and storage medium based on vibrating string type sensor |
| CN110470338A (en) * | 2019-07-16 | 2019-11-19 | 上海尚毅测控技术有限公司 | A kind of analog quantity turns the mobile data collecting method of audio |
-
2010
- 2010-12-03 CN CN2010206402157U patent/CN201974154U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426052A (en) * | 2011-09-16 | 2012-04-25 | 重庆恩菲斯软件有限公司 | Vibration wire type data acquisition system and method |
| CN109580085A (en) * | 2018-10-17 | 2019-04-05 | 广州中海达定位技术有限公司 | A kind of antinoise measurement method, electronic equipment and storage medium based on vibrating string type sensor |
| CN110470338A (en) * | 2019-07-16 | 2019-11-19 | 上海尚毅测控技术有限公司 | A kind of analog quantity turns the mobile data collecting method of audio |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20121203 |