CN210922652U - Signal on-line enhancing device for vibrating wire type sensor - Google Patents
Signal on-line enhancing device for vibrating wire type sensor Download PDFInfo
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- CN210922652U CN210922652U CN201922365185.7U CN201922365185U CN210922652U CN 210922652 U CN210922652 U CN 210922652U CN 201922365185 U CN201922365185 U CN 201922365185U CN 210922652 U CN210922652 U CN 210922652U
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Abstract
The utility model discloses a vibrating string type sensor signal online enhancing device, which comprises a vibration excitation signal pickup circuit, a vibration excitation signal amplifying circuit, a vibration excitation signal controlled output circuit, a sensing signal conditioning circuit, a sensing signal controlled output circuit and a controller; the input end of the excitation signal pickup circuit is connected with the end of the reading instrument, and the output end of the excitation signal pickup circuit is connected with the controller and the excitation signal amplifying circuit; the output end of the excitation signal amplifying circuit is connected with the normally closed end of the excitation signal controlled output circuit; the normally open end of the excitation signal controlled output circuit is connected with the input end of the induction signal conditioning circuit, and the common end of the excitation signal controlled output circuit is connected with the sensor end; the controlled output circuit of the excitation signal is connected with the controller; the output end of the induction signal conditioning circuit is connected with the normally open end of the induction signal controlled output circuit; and the common end of the induction signal controlled output circuit is connected with the sensor end. The utility model discloses can restore vibrating wire sensor system, it is convenient to insert, need not additionally to connect the power, and fault strong adaptability.
Description
Technical Field
The utility model particularly relates to a vibrating wire formula sensor signal strengthens device on line.
Background
The basic components of the vibrating wire sensor system include a sensor, a signal cable and a reading instrument. The sensor generally comprises a steel string 100 capable of vibrating, an exciting coil 102 and two fixed ends 101. The excitation coil 102 is led out from both ends through corresponding signal cables 103, see fig. 1.
The physical quantity measured by the sensor, such as stress, pressure and the like, can change the natural vibration frequency of the steel string 100, and can be measured by a reading instrument connected with the sensor through a signal cable 103. The measurement principle is as follows: firstly, the reading instrument applies an excitation signal to two ends of an excitation coil 102 of the sensor through a signal cable 103, the steel string 100 in the sensor is forced to vibrate, and the damping vibration is continued after the application of the excitation signal is stopped. At this time, the mechanical oscillation of the steel string 100 is converted into an induction signal through the exciting coil 102, and the induction signal is transmitted back to the reading instrument through the signal cable 103. The frequency of the signal is measured by the reading instrument, and the natural vibration frequency of the steel string 100 can be measured. Generally, the frequency range is 500-5000 Hz, the corresponding signal voltage amplitude is about 1mV, and the excitation signal voltage amplitude is generally more than 5V.
The vibrating wire sensor system may not work properly or may have incorrect readings due to damage to the signal cable 103 during installation or after a period of use. The signal cable 103 is generally buried in the interior of a building, and if damaged, it is often not replaced or repaired conditionally, causing the failure of the entire sensor system, which makes the evaluation of the building state difficult.
The damaged signal cable mainly has three fault types, wherein the first type is that the cable has open circuit or short circuit fault, so that the sensor cannot receive an excitation signal and the reading instrument cannot receive an induction signal; the second type is that the signal transmission performance of the cable is poor, so that an excitation signal received by a sensor is weak, or an induction signal received by a reading instrument is weak; the third type is that the cable has poor interference rejection and excessive noise signals are coupled.
For the latter two types, although the sensor and the reading instrument can receive a certain signal, the system is in an "abnormal state" beyond the signal processing range, and the system also cannot work normally or the reading is incorrect.
At present, for the latter two types of instruments, the instruments can still be treated only according to the industry standard 'SL 621-2013 dam safety monitoring instrument abandonment standard' which takes effect in 2013. With the increase of the operating life of the building, more and more monitoring instruments which are scrapped and can not be replaced are provided, and in severe cases, the corresponding parts of the building can not master the operating state due to the lack of the available monitoring instruments.
For a long time, as the monitoring instrument which cannot be replaced does not have the repair condition, the development of the monitoring industry is always troubled, and the condition that the data of the effective monitoring instrument is lacked at the critical moment happens occasionally. Repair methods for non-replaceable instruments have been explored, but have seen little success in the industry.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an online reinforcing apparatus of vibration wire formula sensor signal to above-mentioned prior art, can strengthen vibration wire formula sensor's excitation signal and inductive signal on line, make it satisfy the processing range of sensor and reading appearance signal, resume sensor system's normal operating condition.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a vibration wire type sensor signal online enhancing device is characterized by comprising a vibration excitation signal pickup circuit, a vibration excitation signal amplifying circuit, a vibration excitation signal controlled output circuit, a sensing signal conditioning circuit, a sensing signal controlled output circuit and a controller; wherein the content of the first and second substances,
the input end of the excitation signal pickup circuit is connected with a measuring circuit at the reading instrument end; the output end of the excitation signal pickup circuit is connected with the input end of the controller and the input end of the excitation signal amplifying circuit; the output end of the excitation signal amplifying circuit is connected with the normally closed end of the excitation signal controlled output circuit; the normally open end of the excitation signal controlled output circuit is connected with the input end of the induction signal conditioning circuit; the common end of the excitation signal controlled output circuit is connected with a measuring circuit at the sensor end; the control end of the excitation signal controlled output circuit is connected with the output end of the controller; the output end of the induction signal conditioning circuit is connected with the normally open end of the induction signal controlled output circuit; the common end of the induction signal controlled output circuit is connected with a measuring circuit at the sensor end; the control end of the induction signal controlled output circuit is connected with the output end of the controller.
Furthermore, the online enhancing device further comprises a power supply circuit, wherein the input end of the power supply circuit is connected with the measuring line at the reading instrument end, and the output end of the power supply circuit is electrically connected with each sub-circuit of the online enhancing device.
As a preferable mode, the excitation signal pickup circuit comprises a low-power differential amplifier, the input end of the low-power differential amplifier is connected with the measuring line at the reading instrument end, and the output end of the low-power differential amplifier is connected with the controller and the excitation signal amplification circuit;
the excitation signal amplifying circuit comprises a high-power single-ended amplifier and a constant current circuit, wherein the output end of the high-power single-ended amplifier is connected with the constant current circuit, the input end of the high-power single-ended amplifier is connected with an excitation signal pickup circuit, and the output end of the constant current circuit is connected with an excitation signal controlled output circuit;
the excitation signal controlled output circuit comprises a double-pole double-throw electronic switch, a normally closed end of the double-pole double-throw electronic switch is connected with an excitation signal amplifying circuit, a normally opened end of the double-pole double-throw electronic switch is connected with an induction signal conditioning circuit, a public end of the double-pole double-throw electronic switch is connected with a measuring circuit of a vibrating string sensor end, and a control end of the double-pole double-throw electronic switch is connected with an output end of a controller;
the induction signal conditioning circuit comprises one or more of a filter circuit, a level adjusting circuit and an impedance matching circuit, the input end of the induction signal conditioning circuit is connected with the excitation signal controlled output circuit, and the output end of the induction signal conditioning circuit is connected with the induction signal controlled output circuit;
the induction signal controlled output circuit comprises a double-pole single-throw normally open electronic switch, the normally open end of the double-pole single-throw normally open electronic switch is connected with the induction signal conditioning circuit, the common end of the double-pole single-throw normally open electronic switch is connected with a measuring circuit at the end of a reading instrument, and the control end of the double-pole single-throw normally open electronic switch is connected with the controller;
the controller comprises an amplitude detection circuit and a level trigger, wherein the output end of the amplitude detection circuit is connected with the level trigger, the input end of the amplitude detection circuit is connected with an excitation signal pickup circuit, and the output end of the level trigger is connected with an excitation signal controlled output circuit and an induction signal controlled output circuit.
As a preferable mode, the power supply circuit comprises a full-bridge rectification circuit, an output end of the full-bridge rectification circuit outputs power supply voltage through a capacitor, and an input end of the full-bridge rectification circuit is connected with a measurement circuit at a reading instrument end; and the capacitor is connected with each subcircuit of the signal online enhancing device of the vibrating wire sensor.
Furthermore, the power supply circuit also comprises an anti-reverse diode arranged between the capacitor and each subcircuit of the signal online enhancement device of the vibrating wire sensor.
Compared with the prior art, the utility model discloses following beneficial effect has:
first, the utility model discloses can restore the vibration wire formula sensor system not removable, fill the technical blank. In the past, for the faults that the signal transmission performance of a signal cable is poor or the anti-interference performance of the signal cable is poor, the signal cable and the vibrating wire type sensor are both deeply buried in a building and cannot be replaced, and instruments can only be scrapped. Adopt the utility model discloses afterwards, can compensate the influence of signal cable trouble to vibrating wire sensor signal for vibrating wire sensor system resumes normal operating condition, saves back condemned instrument.
Second, the utility model discloses work influence to original vibrating wire formula sensor system is less, only needs to concatenate it on near the cable of reading appearance output, can play a role, does not influence sensor system's excitation signal and inductive signal pickup process. Original system need not additionally to set up, inserts the utility model discloses can resume original normal operating condition immediately afterwards.
Third, the utility model discloses need not additionally to connect the power, can directly get the electricity from the excitation signal of reading appearance. The excitation signal is converted into direct current and stored, so that the power supply of the sensor system in the whole measuring process can be met.
Fourth, the utility model discloses adaptability to the trouble is stronger, and the excitation signal carries out constant current output after enlargiing, has both guaranteed that vibrating string formula sensor coil has sufficient exciting current, can prevent again that the high pressure from burning out the coil. The adopted filter circuit, the level adjusting circuit and the impedance matching circuit can suppress and measure line interference signals, improve the amplitude of induction signals and recover the standard output impedance of cables and sensor coils, and basically covers most fault types of the vibrating wire type sensor system.
Drawings
Fig. 1 is a diagram of the basic components of a vibrating wire sensor.
Fig. 2 is a corresponding method schematic diagram of the present invention.
Fig. 3 shows the components included in the device of the present invention.
FIG. 4 is one embodiment of a sense signal conditioning circuit for level adjustment and impedance matching of a sense signal.
FIG. 5 is another embodiment of an inductive signal conditioning circuit for filtering, level adjusting and impedance matching an inductive signal.
Fig. 6 is an embodiment of the device of the present invention.
The reference numbers in the above figures are respectively:
the device comprises a 1-excitation signal pickup circuit, a 2-excitation signal amplification circuit, a 3-excitation signal controlled output circuit, a 4-induction signal conditioning circuit, a 5-induction signal controlled output circuit, a 6-controller, a 7-power supply circuit, an 8-online enhancement device equivalent load, a 9-vibrating string type sensor, a 10-reading instrument, a 100-steel string, a 101-fixed end, a 102-excitation coil, a 103-signal cable, a 11-low-power differential amplifier, a 21-constant current circuit, a 22-high-power single-ended amplifier, a 31-double-pole double-throw electronic switch, a 41-signal conditioning circuit, a 42-differential amplifier, a 43-filter circuit, a 51-double-pole single-throw electronic switch, a 61-level trigger, a 62-amplitude detection circuit, a 71-full-bridge rectification circuit, a 72-capacitor, a 73-anti-reverse diode and an 81-equivalent load.
Detailed Description
As shown in fig. 2, the method for online enhancing the signal of the vibrating wire sensor of the present invention comprises the following steps:
In the step 2, before the excitation signal is picked up, the method further comprises the step of converting the excitation signal sent by the reading instrument 10 into direct current to supply power for the signal online enhancement device.
In step 3, the conditioning method of the induction signal includes one or more of filtering, level adjustment and impedance matching.
As shown in fig. 3, the device for online enhancing signal of vibrating wire sensor of the present invention comprises an excitation signal pickup circuit 1, an excitation signal amplification circuit 2, an excitation signal controlled output circuit 3, a sensing signal conditioning circuit 4, a sensing signal controlled output circuit 5, a controller 6, and a power supply circuit 7.
The input end of the excitation signal pickup circuit 1 is connected with a measuring circuit at the end of the reading instrument 10; the output end of the excitation signal pickup circuit 1 is connected with the input end of the controller 6 and the input end of the excitation signal amplifying circuit 2; the output end of the excitation signal amplifying circuit 2 is connected with the normally closed end of the excitation signal controlled output circuit 3; the normally open end of the excitation signal controlled output circuit 3 is connected with the input end of the induction signal conditioning circuit 4; the common end of the excitation signal controlled output circuit 3 is connected with a measuring circuit at the sensor end; the control end of the excitation signal controlled output circuit 3 is connected with the output end of the controller 6; the output end of the induction signal conditioning circuit 4 is connected with the normally open end of the induction signal controlled output circuit 5; the common end of the induction signal controlled output circuit 5 is connected with a measuring circuit at the sensor end; the control end of the induction signal controlled output circuit 5 is connected with the output end of the controller 6; the input end of the power supply circuit 7 is connected with the measuring line of the reading instrument end; the output end of the power supply circuit 7 is connected to each power supply input end of each sub-circuit of the signal online enhancement device.
Wherein:
excitation signal pickup circuit 1: the vibration exciting device is used for converting the vibration exciting signal sent by the reading instrument 10 into a standard electric signal on a measuring line formed by the vibrating wire type sensor 9 and the reading instrument 10.
Excitation signal amplification circuit 2: and the constant current amplifier is used for amplifying the excitation signal converted into the standard electric signal and outputting the excitation signal in a constant current mode.
Excitation signal controlled output circuit 3: and the controller is used for outputting the amplified excitation signal to a measuring circuit at the end of the vibrating wire sensor 9 or outputting the induction signal from the end of the vibrating wire sensor 9 to the induction signal conditioning circuit 4 according to the control logic electric signal of the controller 6.
The induction signal conditioning circuit 4: the sensor is used for picking up the induction signal on the measuring line at the end 9 of the vibrating wire sensor and conditioning the signal.
The sensing signal controlled output circuit 5: and according to the control logic electric signal of the controller 6, outputting the induction signal subjected to signal conditioning to a measuring line at the end of the reading instrument 10.
The controller 6: the device is used for judging whether an excitation signal exists on a measuring line formed by the vibrating wire type sensor 9 and the reading instrument 10 or not and outputting a control logic electric signal to the excitation signal controlled output circuit 3 and the induction signal controlled output circuit 5; the control logic of the control logic electric signal output by the controller 6 comprises: when an excitation signal exists on a measuring line formed by the vibrating wire type sensor 9 and the reading instrument 10, controlling the excitation signal controlled output circuit 3 to output the amplified excitation signal to the measuring line at the end of the vibrating wire type sensor 9; when no excitation signal exists on a measuring line formed by the vibrating string sensor 9 and the reading instrument 10, the excitation signal controlled output circuit 3 is controlled to output the induction signal from the vibrating string sensor 9 end to the induction signal conditioning circuit 4, and the induction signal controlled output circuit 5 is controlled to output the induction signal conditioned by the signal to the measuring line at the reading instrument 10 end.
The power supply circuit 7: the device is used for converting an excitation signal sent by the reading instrument 10 into direct current to supply power to each sub-circuit of the vibrating string type sensor signal online enhancing device.
In specific practice, the amplitude and frequency of the excitation signal emitted by the reading instrument 10 in fig. 3 are different according to different manufacturers, the corresponding vibration wire type sensor 9 is also different among different manufacturers, and the reading instrument 10 and the vibration wire type sensor 9 are selected from the same manufacturer for matching use.
For convenience of describing the specific embodiment, the amplitude of the excitation voltage of the reading instrument 10 in fig. 3 is set to be ± 5V, and the excitation frequency is swept to be 500Hz to 5000H; the rated exciting current of the corresponding vibrating wire sensor 9 is 30mA, the rated voltage of the output induction signal is 1mV, and the resonant frequency is 2000 Hz.
When the reading instrument 10 is used for normal reading, the reading instrument 10 loads an excitation signal with the frequency of 500Hz to 5000Hz and the amplitude of +/-5V on the cable, and when the frequency sweep of the excitation signal of the reading instrument 10 is output to about 2000Hz, the vibrating string type sensor 9 is in a resonance state, and the steel string 100 starts to vibrate. After the frequency sweeping process of the reading instrument 10 is completed, the steel wire 100 of the vibrating wire sensor 9 continues to oscillate, the reading instrument 10 measures the frequency of a 1mV sensing signal output by the exciting coil 102 through the signal cable 103 at the moment, and an actual measurement value with the frequency of 2000Hz is displayed on the reading instrument 10.
In the prior art:
when the cable signal transmission performance is degraded and the fault occurs, for example, the excitation signal received by the vibrating wire sensor 9 is attenuated through the signal cable 103, the excitation voltage applied to the two ends of the vibrating wire sensor 9 is only ± 0.5V, the induction signal output by the corresponding vibrating wire sensor 9 is also reduced to only 0.1mV, and the amplitude is further reduced to 0.05mV when the excitation signal is transmitted to the reading instrument 10 end through the attenuation of the signal cable 103. At this time, the reader 10 cannot measure its frequency because the amplitude of the received sensing signal is too small, and the sensor system cannot work normally.
When a fault occurs in which the interference resistance of the cable is poor, for example, a 50Hz power frequency signal with an amplitude of 100mV is coupled in. At this time, the reading instrument 10 receives a power frequency signal far greater than the sensing signal, and the frequency measurement circuit inside the reading instrument 10 outputs the frequency of the power frequency signal under the influence of the power frequency signal, so that the frequency of the sensing signal output by the vibrating string sensor 9 cannot be measured, and the sensor system cannot work normally.
And sensor system adds the utility model discloses carry out the online reinforcing back of signal, the utility model discloses each partial concrete implementation processing flow does:
fig. 4 shows an embodiment of the sensing signal conditioning circuit 4 for level adjustment and impedance matching of the sensing signal, wherein after the sensing signal of 0.05mV enters the sensing signal conditioning circuit 4, the sensing signal is amplified 1000 times by the differential amplifier 42, the amplitude after level adjustment reaches 50mV, and meanwhile, the equivalent output impedance of the signal cable 103 and the sensor reaching thousands of ohms is reduced to tens of ohms, so that the coupling efficiency is increased.
Specifically, if the level adjustment multiple is 1, the induced signal conditioning circuit 4 shown in fig. 4 has only an impedance matching function.
Fig. 5 shows an embodiment of the sensing signal conditioning circuit 4 for filtering, level adjustment and impedance matching of the sensing signal, wherein after the sensing signal of 0.05mV and the power frequency signal of 100mV enter the sensing signal conditioning circuit 4, the sensing signal is filtered by the filter circuit 43, so that the power frequency signal can be attenuated by 80dB to 0.000001mV, while the amplitude of the sensing signal is not attenuated and still is 0.05mV, and at this time, the interference of the power frequency signal can be basically ignored. Then amplified 1000 times by the differential amplifier 42, the amplitude reaches 50mV, and simultaneously the equivalent output impedance of the signal cable 103 and the sensor reaching thousands of ohms is reduced to tens of ohms, and the coupling efficiency is increased.
The utility model discloses an induction signal conditioning circuit 4 can select among the above-mentioned embodiment according to the difference of sensor system fault type, reconnects and constitutes the utility model discloses. Following show the utility model discloses can adapt to all sensor system fault types's embodiment:
fig. 6 shows an embodiment of the present invention, and as shown in fig. 6, the excitation signal pickup circuit 1 includes a low-power differential amplifier 11, an input end of the low-power differential amplifier 11 is connected to a measurement line at the end of the reading instrument 10, and an output end of the low-power differential amplifier 11 is connected to the controller 6 and the excitation signal amplification circuit 2.
The excitation signal amplifying circuit 2 comprises a high-power single-ended amplifier 22 and a constant current circuit 21, the output end of the high-power single-ended amplifier 22 is connected with the constant current circuit 21, the input end of the high-power single-ended amplifier 22 is connected with the excitation signal pickup circuit 1, and the output end of the constant current circuit 21 is connected with the excitation signal controlled output circuit 3.
The excitation signal controlled output circuit 3 comprises a double-pole double-throw electronic switch 31, a normally closed end of the double-pole double-throw electronic switch 31 is connected with the excitation signal amplifying circuit 2, a normally open end of the double-pole double-throw electronic switch 31 is connected with the induction signal conditioning circuit 4, a public end of the double-pole double-throw electronic switch 31 is connected with a measuring circuit at the end of the vibrating string sensor 9, and a control end of the double-pole double-throw electronic switch 31 is connected with an output end of the controller 6.
The induction signal conditioning circuit 4 comprises one or more of a filter circuit 43, a level adjusting circuit and an impedance matching circuit, the input end of the induction signal conditioning circuit 4 is connected with the excitation signal controlled output circuit 3, and the output end of the induction signal conditioning circuit 4 is connected with the induction signal controlled output circuit 5.
The induction signal controlled output circuit 5 comprises a double-pole single-throw normally-open electronic switch 51, the normally-open end of the double-pole single-throw normally-open electronic switch 51 is connected with the induction signal conditioning circuit 4, the common end of the double-pole single-throw normally-open electronic switch 51 is connected with a measuring circuit at the end of the reading instrument 10, and the control end of the double-pole single-throw normally-open electronic switch 51 is connected with the controller 6.
The controller 6 comprises an amplitude detection circuit 62 and a level trigger 61, wherein the output end of the amplitude detection circuit 62 is connected with the level trigger 61, the input end of the amplitude detection circuit 62 is connected with the excitation signal pickup circuit 1, and the output end of the level trigger 61 is connected with the excitation signal controlled output circuit 3 and the induction signal controlled output circuit 5.
The power supply circuit 7 comprises a full-bridge rectifying circuit 71, the output end of the full-bridge rectifying circuit 71 outputs power supply voltage through a capacitor 72, and the input end of the full-bridge rectifying circuit 71 is connected with a measuring circuit at the end of the reading instrument 10; the capacitor 72 is connected with each subcircuit of the signal online enhancing device of the vibrating wire type sensor.
The power supply circuit 7 further comprises an anti-reverse diode 73 arranged between the capacitor 72 and each sub-circuit of the vibrating wire sensor signal online enhancing device.
The working principle of fig. 6 is as follows:
the reading instrument 10 applies an excitation signal with an excitation voltage amplitude of +/-5V to a measurement line, the excitation signal is loaded on a full-bridge rectifying circuit 71 of the power supply circuit 7, rectified into a pulsating voltage with a peak value of about 10V and output to a capacitor 72, the signal is connected to each equivalent load 81 of the online enhancement device through an anti-reverse diode 73, and the anti-reverse diode 73 is used for preventing the equivalent load 8 of the online enhancement device from reversely charging the capacitor 72.
In practice, farad capacitance is selected as the capacitor 72, and the stored electric quantity can meet the power supply of each load of the online enhancement device. Generally, the reader 10 adopts a constant voltage excitation method, and because the equivalent resistance of the farad capacitor is small when the reader is not charged, a large charging current can be obtained, which far exceeds the rated excitation current of 30mA of the vibrating wire sensor, so that the farad capacitor can be fully charged in a short time after the excitation starts. If the maximum output current of the reading instrument 10 is small, or constant current output is adopted, the charging process is slow, the farad capacitor does not store the required electric quantity in an excitation period, the whole device still does not work, the charging is continued when the reading instrument 10 sends an excitation signal next time, and the device starts to work again until the electric quantity stored by the farad capacitor meets the use of each load of the on-line enhancement device. The reading apparatus 10 can start to acquire valid data only after being excited for a plurality of times, and the characteristic generally does not influence the normal operation of the system. If special requirements exist, effective data need to be obtained immediately, and the problem can still be solved by adopting a method of additionally configuring an external power supply.
After the on-line reinforcing device is electrified and enters a normal working state, when an excitation signal exists on a measuring line:
the excitation signal on the measuring line at the end of the reading instrument 10 is input into a low-power differential amplifier 11 in the excitation signal pickup circuit 1, amplified by about 100 times, converted into square waves as standard electric signals and output to the excitation signal amplification circuit 2 and the controller 6.
The standard signal is input to the high-power single-ended amplifier 22 of the excitation signal amplifying circuit 2, voltage-amplified, and then enters the constant current circuit 21 for current-limiting output.
When the standard signal is input to the amplitude detection circuit 62 of the controller 6, the amplitude detection circuit 62 outputs a high level, and the level flip-flop 61 outputs an enable signal. A double-pole double-throw electronic switch 31 in the controlled excitation signal output circuit 3 is controlled, the output of the excitation signal amplifying circuit 2 is loaded on the vibrating string type sensor 9, and the output between the sensor 9 and the induction signal conditioning circuit 4 is cut off; meanwhile, a double-pole single-throw normally-open electronic switch 51 in the induction signal controlled output circuit 5 is controlled to cut off the output from the induction signal conditioning circuit 4 to a measuring line at the end of the reading instrument 10.
The excitation signal can be amplified and limited and then loaded on a measuring circuit at the end of the vibrating string type sensor 9.
After the on-line enhancement device is electrified and enters a normal working state, when no excitation signal exists on a measuring line:
the no-standard signal is input to the amplitude detection circuit 62 of the controller 6, the amplitude detection circuit 62 outputs a low level, and the level flip-flop 61 outputs an inhibit signal. A double-pole double-throw electronic switch 31 in the controlled excitation signal output circuit 3 is controlled to cut off the output of the excitation signal amplifying circuit 2 from being loaded on the sensor 9, and the output of the vibrating wire type sensor 9 is connected to the induction signal conditioning circuit 4 in parallel; meanwhile, a double-pole single-throw normally-open electronic switch 51 in the controlled output circuit 5 for controlling the induction signal is communicated with the induction signal conditioning circuit 4 to output between measurement lines at the end of the reading instrument 10.
The sensing signal can be loaded on a measuring line at the end of the reading instrument 10 after being conditioned by the signal. At this time, although the amplitude of the sensing signal conditioned by the signal reaches 50mV and passes through the full-bridge rectifier circuit 71 of the power supply circuit 7, since the forward on voltage of the full-bridge rectifier circuit 71 is greater than 400mV, the small signal is in a high impedance state when passing through, and thus, the transmission of the sensing signal is not affected.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (5)
1. A signal online enhancement device for a vibrating wire type sensor is characterized by comprising a vibration excitation signal pickup circuit (1), a vibration excitation signal amplification circuit (2), a vibration excitation signal controlled output circuit (3), a sensing signal conditioning circuit (4), a sensing signal controlled output circuit (5) and a controller (6); wherein the content of the first and second substances,
the input end of the excitation signal pickup circuit (1) is connected with a measuring circuit at the end of the reading instrument (10); the output end of the excitation signal pickup circuit (1) is connected with the input end of the controller (6) and the input end of the excitation signal amplification circuit (2); the output end of the excitation signal amplifying circuit (2) is connected with the normally closed end of the excitation signal controlled output circuit (3); the normally open end of the excitation signal controlled output circuit (3) is connected with the input end of the induction signal conditioning circuit (4); the common end of the excitation signal controlled output circuit (3) is connected with a measuring circuit at the sensor end; the control end of the excitation signal controlled output circuit (3) is connected with the output end of the controller (6); the output end of the induction signal conditioning circuit (4) is connected with the normally open end of the induction signal controlled output circuit (5); the common end of the induction signal controlled output circuit (5) is connected with a measuring circuit at the sensor end; the control end of the induction signal controlled output circuit (5) is connected with the output end of the controller (6).
2. The vibrating wire sensor signal on-line enhancement device according to claim 1, further comprising a power supply circuit (7), wherein an input end of the power supply circuit (7) is connected with the measuring line at the reading instrument end, and an output end of the power supply circuit (7) is electrically connected with each subcircuit of the on-line enhancement device.
3. The vibrating wire sensor signal in-line enhancement device according to claim 1,
the excitation signal pickup circuit (1) comprises a low-power differential amplifier (11), the input end of the low-power differential amplifier (11) is connected with a measuring circuit at the end of the reading instrument (10), and the output end of the low-power differential amplifier (11) is connected with the controller (6) and the excitation signal amplification circuit (2);
the excitation signal amplifying circuit (2) comprises a high-power single-ended amplifier (22) and a constant current circuit (21), the output end of the high-power single-ended amplifier (22) is connected with the constant current circuit (21), the input end of the high-power single-ended amplifier (22) is connected with the excitation signal pickup circuit (1), and the output end of the constant current circuit (21) is connected with an excitation signal controlled output circuit (3);
the excitation signal controlled output circuit (3) comprises a double-pole double-throw electronic switch (31), a normally closed end of the double-pole double-throw electronic switch (31) is connected with the excitation signal amplifying circuit (2), a normally open end of the double-pole double-throw electronic switch (31) is connected with the induction signal conditioning circuit (4), a common end of the double-pole double-throw electronic switch (31) is connected with a measuring circuit at the end of the vibrating string sensor (9), and a control end of the double-pole double-throw electronic switch (31) is connected with an output end of the controller (6);
the induction signal conditioning circuit (4) comprises one or more of a filter circuit (43), a level adjusting circuit and an impedance matching circuit, the input end of the induction signal conditioning circuit (4) is connected with the excitation signal controlled output circuit (3), and the output end of the induction signal conditioning circuit (4) is connected with the induction signal controlled output circuit (5);
the induction signal controlled output circuit (5) comprises a double-pole single-throw normally-open electronic switch (51), the normally-open end of the double-pole single-throw normally-open electronic switch (51) is connected with the induction signal conditioning circuit (4), the public end of the double-pole single-throw normally-open electronic switch (51) is connected with a measuring circuit at the end of the reading instrument (10), and the control end of the double-pole single-throw normally-open electronic switch (51) is connected with the controller (6);
the controller (6) comprises an amplitude detection circuit (62) and a level trigger (61), the output end of the amplitude detection circuit (62) is connected with the level trigger (61), the input end of the amplitude detection circuit (62) is connected with the excitation signal pickup circuit (1), and the output end of the level trigger (61) is connected with the excitation signal controlled output circuit (3) and the induction signal controlled output circuit (5).
4. The vibrating wire sensor signal online enhancing device according to claim 2, wherein the power supply circuit (7) comprises a full-bridge rectifying circuit (71), an output end of the full-bridge rectifying circuit (71) outputs a power supply voltage through a capacitor (72), and an input end of the full-bridge rectifying circuit (71) is connected with a measuring circuit at the reading instrument (10) end; and the capacitor (72) is connected with each subcircuit of the signal online enhancement device of the vibrating wire sensor.
5. The vibrating wire sensor signal online enhancer of claim 4, characterized in that the power supply circuit (7) further comprises an anti-reverse diode (73) arranged between the capacitor (72) and each subcircuit of the vibrating wire sensor signal online enhancer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922365185.7U CN210922652U (en) | 2019-12-25 | 2019-12-25 | Signal on-line enhancing device for vibrating wire type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922365185.7U CN210922652U (en) | 2019-12-25 | 2019-12-25 | Signal on-line enhancing device for vibrating wire type sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210922652U true CN210922652U (en) | 2020-07-03 |
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