CN111751774A - Wheatstone bridge-based weak signal anti-interference detection processing method and device - Google Patents
Wheatstone bridge-based weak signal anti-interference detection processing method and device Download PDFInfo
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- CN111751774A CN111751774A CN201910235910.0A CN201910235910A CN111751774A CN 111751774 A CN111751774 A CN 111751774A CN 201910235910 A CN201910235910 A CN 201910235910A CN 111751774 A CN111751774 A CN 111751774A
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Abstract
The invention discloses a Wheatstone bridge-based weak signal anti-interference detection processing method and device. The method adopts a plurality of sensor elements to form a Wheatstone bridge, generates a direct current signal UI which is loaded to the two ends of A, C to drive the Wheatstone bridge, and detects a weak signal by the Wheatstone bridge and converts the weak signal into an electric signal to obtain a voltage signal output from B, D; after the differential signal is amplified by following amplifiers A1 and A2, a gate circuit controls the signal with a fixed frequency, the output signal F, E after pre-amplification and filtration is switched to be output and is converted into a sinusoidal signal with fixed frequency output after passing through a square wave to sine wave circuit to the differential amplifier A3, and the output amplitude of the signal is determined by the differential amplifier with fixed amplification factor. The method is simple and easy to implement, the output signal is amplified to a certain degree on the basis of the original amplitude, and the output signal is fixed on the frequency by switching the fixed frequency, so that the interference of noise on the signal can be effectively eliminated by subsequent phase-locked amplification detection.
Description
Technical Field
The invention relates to a Wheatstone bridge detection circuit, in particular to a method and a system for improving anti-interference characteristics based on the Wheatstone bridge detection circuit.
Background
The bridge is a measuring circuit which converts element parameters such as resistance, inductance and capacitance into voltage or current. The circuit is simple, high in precision and high in sensitivity, and is widely applied to detection circuits. The non-electric quantity of the strain of the resistance strain gauge is converted into electric quantity, namely, the resistance change is converted into the voltage change through the bridge, and then the strain quantity detection is realized by measuring the change of the output voltage of the bridge. Because the variable quantity of the strain resistor is small, the strain resistor is often interfered by noise in the detection process, so that the anti-interference processing becomes an especially important design requirement in a bridge signal detection circuit in the detection process.
At present, bridges are used in combination with sensor circuits in the detection technology, and include two major types, namely direct current bridges and alternating current bridges, wherein direct current power supplies are loaded at input ends of the bridges, the bridges are direct current circuits, and bridge arm elements of the direct current bridges are resistors; when an alternating current signal is loaded at the input end of the circuit, the bridge is called an alternating current bridge, and bridge arm elements of the alternating current bridge can be a resistor, an inductor and a capacitor. Taking a DC bridge as an example, the schematic diagram is shown in FIG. 1, and four arms of the bridge have resistors R1,R2,R3,R4Four resistors, the a and c ends of the bridge are input with a direct current power supply UIThe bridge b, d end takes the output signal. When the impedance of the output end of the bridge is high, the output end of the bridge is equivalent to an open circuit state, and the output voltage is
Namely have
As can be seen from the above equation, to make the bridge in the equilibrium state, i.e. the output voltage is zero, the bridge is in the neutral state
If the output end of the bridge is connected with an internal resistance Rg current meter, any active two-end network can be replaced by an equivalent circuit formed by connecting a constant electromotive force Uol and resistors Rg and R0 in series according to the Thevenin theorem. The circuit can thus be simplified to that shown in figure 2. The equivalent resistance at two ends of the original network bd, namely the equivalent network circuit internal resistance R0, can be obtained and is equal to the series-parallel resistance of the circuit
An open circuit voltage across bd of
The output voltage of the bridge is
Is simple and easy to obtain
From the above formula when
When the voltage at the output end of the bridge is zero, the galvanometer does not deflect, and the bridge is in a balanced state.
When noise appears in the bridge circuit formed by the strain gauges, the output signal U of the bridge circuit is outputoInterference is generated, and the corresponding variable measurement is inaccurate.
Disclosure of Invention
In view of this, embodiments of the present invention provide an anti-interference detection method and system based on a wheatstone bridge, which can improve anti-interference capabilities of the wheatstone bridge in detection and signal transmission processes, and improve amplitude of signal output.
In a first aspect, an embodiment of the present invention provides an anti-interference detection system based on a wheatstone bridge, including: a driving power supply, a following amplifying circuit, a signal switching circuit, a differential amplifying circuit, a switching control signal generating circuit, etc., wherein,
the driving power supply is used for detecting a system and a unified power supply module of the Wheatstone bridge, when the system starts to detect, the driving power supply starts to supply power to the Wheatstone bridge, the driving bridge drives the corresponding sensor resistor, and meanwhile, two output ends of the bridge output voltage signals. After the detection circuit supplies power, the following amplification circuit, the signal switching circuit, the differential amplification circuit and the switching control circuit start to work, and the bridge outputs differential signals which are converted into amplified sinusoidal signals with fixed frequency to be output;
the following amplifying circuit consists of two following amplifiers, and is used for respectively finishing the following and amplifying processing of two voltage signals output by the bridge, and meanwhile, the module also realizes the isolation of the bridge circuit and a subsequent processing circuit, so that the influence of the subsequent processing circuit on the sensor bridge is reduced;
the switching control signal generating circuit is a periodic oscillation signal of a quartz crystal oscillator with fixed frequency, after shaping and other processing, a square wave control signal is formed, and the control signal acts on the signal switching chip, so that the input switching control of the differential amplifying circuit is realized;
the signal switching circuit is used for switching the connection between the signals after the following amplification and the differential amplification circuit, when the output of the switching control circuit is in a high level, the two paths of signals output by the following amplification circuit are communicated with the positive electrode and the negative electrode of the differential amplification circuit, and conversely, when the output of the switching control circuit is in a low level, the switching circuit realizes the connection switching, so that the two paths of outputs of the following amplification circuit are respectively communicated with the negative electrode and the positive electrode of the differential amplifier, and the switching of the signals at the input end of the differential amplification circuit according to a fixed frequency is realized;
the differential amplification circuit is used for amplifying and outputting differential signals which are output by the switching chip and switched at fixed frequency, the amplification factor of the differential amplification circuit is determined by the bridge strain resistor and the variation range of the following amplified output signals, and in order to enable the output signals to have good anti-interference characteristics, the amplification factor of the differential amplification circuit is set to be 1V peak-to-peak according to the maximum variation amplitude of the output signals under the condition of maximum amplitude input.
Preferably, the bridge circuit and the signal processing circuit are selected to supply power uniformly, so that the power supply complexity of the front-end signal detection and processing circuit is reduced.
Preferably, the bridge circuit output signal is directly followed by amplification processing, so that the bridge circuit signal is effectively isolated from a subsequent detection circuit, and the interference of the detection circuit on the bridge circuit signal is reduced.
Preferably, the output signal of the detection circuit is a fixed-frequency sine wave signal, which is beneficial to the secondary processing of the subsequent signals, such as phase-locked amplification, correlation detection, and the like.
In a second aspect, an embodiment of the present invention provides an anti-interference detection method based on a wheatstone bridge, including: the alternating current conversion of the bridge circuit output differential signals is realized through switching the control signals and the switching chip, so that the signal output amplitude is effectively amplified, meanwhile, the signal is converted into a periodic signal with fixed frequency, and the anti-interference characteristic of Wheatstone bridge signal detection is improved from two aspects of pre-amplification of the signal and transmission of the signal;
after the resistance change of the measured bridge is measured and is followed and amplified, a signal is accessed to a switching chip to carry out alternating current conversion;
amplifying and shaping the alternating current conversion differential signal output by the switching circuit, and transmitting the alternating current conversion differential signal as an output signal of the bridge detection circuit to a subsequent processing circuit;
if the output amplitude of the differential amplification circuit is larger than 1V within the maximum measuring range of the bridge, circuit parameters need to be adjusted according to the actual measuring range of the bridge, so that the peak-peak value of the output voltage of the differential amplification circuit meets the requirement within 1V, the stability of the output signal of the circuit is ensured, and the complexity of a subsequent detection circuit is reduced;
according to the frequency of the switching circuit, when the frequency of the output switching circuit is different, the front-end capacitance value university needs to be adjusted, or the front end is added with a low-pass filter circuit to realize the sine transformation of the output signal of the switching circuit.
Preferably, the method may further comprise:
the aim of the switching circuit according to the processing is to realize the alternating current conversion of direct current signals, and the sine characteristic of the signals output by the switching circuit can realize the sine of the bridge circuit output differential signals through a square wave signal-to-sine wave circuit.
Preferably, the differential amplifier circuit can be designed as a band-pass differential amplifier circuit under the condition that the frequency of the switching circuit is fixed, so as to ensure the sinusoidal characteristic of the output signal, and the central frequency of the band-pass amplifier circuit is consistent with the frequency of the control signal of the switching circuit.
According to the anti-interference detection method and system based on the Wheatstone bridge, a power supply module is used for driving a bridge to supply a signal, and meanwhile, power supply parts of all modules of a circuit uniformly use the power supply module for supplying power; the bridge measurement signal is amplified, isolated and amplified by the following amplifying circuit, so that the matching characteristic and the driving capability of a subsequent circuit are improved; the signal after the following amplification is subjected to alternating current conversion processing, the signal output by the following amplification is two paths of direct current signals, and in order to reduce the interference of noise on the signal in the transmission process, the forward and reverse switching of the signal output by the following amplification is realized by the switching control circuit with fixed sampling frequency; the switched and transformed input signal is converted into a sinusoidal alternating current signal with fixed frequency after being subjected to capacitance filtering processing, or low-pass filtering processing, or a square wave to sine wave circuit; determining the amplification factor of the differential amplification circuit according to the maximum variation range of the output signals of the bridge circuit, namely the maximum amplitude of the output signals of the bridge circuit, and the maximum amplitude of the signals after the sine transformation, so that the peak-peak value of the output sine alternating current signals is changed within 1V; the differential amplifying circuit can be designed into a band-pass amplifying circuit under the condition of meeting the amplification factor, so that the phase, the waveform and the like of the output sinusoidal signal are more stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional Wheatstone bridge;
FIG. 2 is a schematic diagram of an equivalent circuit of the bridge driving circuit;
FIG. 3 is a schematic diagram of an anti-interference detection circuit based on a Wheatstone bridge according to the embodiment;
FIG. 4 is a flow chart of the Wheatstone bridge anti-interference detection circuit system after sinusoidal transformation.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The Wheatstone bridge detection circuit mainly comprises two parts: the bridge circuit driving part of the Wheatstone bridge and the bridge circuit output differential signal detection circuit. The bridge driving signal is a voltage or current signal loaded to two input ends of a Wheatstone bridge, a direct current or alternating current voltage/current signal is loaded to the bridge driving input end to serve as the bridge driving signal, and the loaded driving signal is required to have higher stability so as to ensure that the amplitude of the output differential signal does not change or shake when the resistance value of a bridge resistor of the output differential signal does not change; the signal detection circuit comprises amplification and collection of differential signals, and when the resistance of the bridge circuit changes slightly, the amplitude of the output differential signals is smaller, the differential signals output by the bridge circuit are directly transmitted through the output circuit, and the differential signals are extremely easily interfered by external electromagnetic environment in the transmission process, so that the bridge circuit detection signals are unstable.
In order to improve the anti-interference capability of the bridge circuit output signals, on one hand, the bridge circuit output differential signals are processed before signal transmission, for example, the bridge circuit output differential signals are directly amplified and then sent to a transmission line; on the other hand, the bridge circuit signals are directly amplified at the output end of the bridge circuit, and then voltage-time conversion is adopted to directly convert the voltage change signals into corresponding digital pulse time width information, so that the anti-interference characteristic of the detection signals is improved.
The existing wheatstone bridge detection circuit usually uses a direct current driving mode, and differential signals output by a bridge circuit are directly transmitted to corresponding amplifying, filtering and analog-digital conversion circuits through cables, so that bridge circuit change signals are detected.
Fig. 3 is a schematic structural diagram of an anti-interference detection system based on a wheatstone bridge according to an embodiment of the present invention. Referring to fig. 3, the bridge signal detection system of the embodiment of the present invention includes: a driving power supply, a following amplifying circuit, a switching control signal generating circuit, a signal switching circuit, a square wave sine wave converting circuit and a differential amplifying circuit,
the Wheatstone bridge outputs differential signals under the drive of the drive power supply, and the amplitude of the differential signals directly reflects the change of the bridge-circuit resistance, namely the change of the corresponding bridge arm resistance of the Wheatstone bridge;
the following amplification circuit realizes following amplification processing of bridge circuit output signals, on one hand, the isolation of a subsequent circuit and the bridge circuit is realized, on the other hand, the amplification of the bridge circuit output signals is realized, and the driving capability of the signals is improved;
the switching signal generating circuit is used for generating a switching control signal with fixed frequency, and after the fixed frequency oscillator works normally, an oscillating signal of the fixed frequency oscillator is shaped to form a square wave signal with fixed frequency;
the switching chip is used for realizing the conversion of an input signal path, and changing the output paths of the two paths of signals according to the level change of the control signal under the control of a fixed-frequency square wave signal;
the square wave sine wave change module is used for realizing conversion from a square wave signal to a sine wave;
and the differential amplification circuit is used for amplifying and outputting sine wave signals, and in order to ensure that the amplitude of the output signals is within the range of 1V from peak value to peak value, the amplification factor of the differential amplification circuit is determined according to the maximum measurement range of the bridge circuit.
In this embodiment, the anti-interference design of the wheatstone bridge detection circuit realizes pre-amplification of bridge output signals, sinusoidal conversion of signals, and ac amplification, and is compared with a mode of directly outputting differential weak signals from the wheatstone bridge. Has the following advantages:
(1) the alternating current conversion of the direct current differential signal output by the Wheatstone circuit is realized through the switching circuit, so that the interference of other frequency signals on the output signal in the signal transmission process is reduced, and the interference signals of other frequencies in the signal transmission process can be better eliminated through phase-locked amplification processing;
(2) the amplitude of the sinusoidal signal output by differential amplification is greatly improved on the basis of the output signal of the Wheatstone bridge, so that the signal has higher signal-to-noise ratio in the transmission process and better anti-interference capability on the signal amplitude;
(3) the high-precision quartz crystal oscillator ensures the frequency stability of the output signal of the detection circuit, and meanwhile, the signal output circuit does not need to transmit a frequency reference signal and can generate the reference signal with the same frequency only by using the oscillator with the same frequency at the subsequent signal detection end;
(4) the transmission of the sine signal of the single frequency simplifies the output structure of the bridge circuit signal, and the subsequent detection and phase-locked amplification circuit only needs to use the capacitor for isolation and then directly carry out phase-locked amplification and other change processing;
(5) the following amplifying circuit arranged at the bridge circuit end avoids long-distance transmission of output signals of the bridge circuit, thereby avoiding the interference of noise on original signals output by the bridge circuit, and simultaneously, the circuit module also ensures the isolation of the bridge circuit and the detection circuit.
Fig. 4 is a schematic flowchart of a wheatstone bridge-based anti-interference detection method according to a second embodiment of the present invention. As shown in fig. 4, the process includes:
404, the switching chip realizes switching of a signal path under the control of a fixed-frequency square wave control signal and outputs the signal path to a square wave to sine wave change circuit;
and 405, connecting the sine-converted signal to a differential amplification circuit, realizing amplitude change of the sine signal, and ensuring that the peak-to-peak value of the sine wave output by the bridge is within 1V.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An anti-interference processing method for outputting weak signals by a Wheatstone bridge is characterized by comprising the following steps: the Wheatstone bridge arm set is composed of one or more than two strain sensor elements, wherein at least one bridge arm is used as a reference bridge arm, and the other bridge arms are used as detection bridge arms; generating a stable direct current voltage signal UI, wherein the signal UI drives the Wheatstone bridge; a detection bridge arm of the Wheatstone bridge detects a weak signal and converts the weak signal into an electric signal to obtain a differential signal between B, D points; respectively carrying out follow amplification on the differential signals through follow amplifiers A1 and A2, and then connecting capacitors C1 and C2 for filtering processing to obtain a pre-processing output signal F, E; the output signals are respectively accessed to the switch controllers, switched by the switch controllers at a fixed frequency (such as 32.768 KHz) and input to the input ends of the differential amplifiers; under the action of a fixed frequency controller, an input signal with fixed frequency conversion is formed at the input end of the differential amplifier, and the input signal is shaped into a sinusoidal signal with fixed frequency under the combined action of the capacitors C1 and C2 and the square wave-to-sine wave circuit; the differential amplifier A3 is used for amplifying and outputting the output alternating signal, the amplification factor is set according to the full scale amplitude of the pre-amplified output signal, so that the alternating signal with the maximum amplitude of peak-peak value 1V is output under the full scale condition.
An anti-interference signal detection system based on a Wheatstone bridge, comprising: a Wheatstone bridge, a bridge driving circuit, a pre-follower amplifier, a fixed frequency switching module, a differential amplifier, etc., wherein,
the wheatstone bridge is driven by the direct-current power supply voltage signal to generate a differential output signal. The variation of the corresponding bridge arm resistance value of the Wheatstone bridge enables the output differential signal to be changed along with the variation of the bridge arm resistance value under the drive of a fixed voltage;
the circuit formed by the following amplifiers A1 and A2 is mainly used for isolation of a Wheatstone bridge and amplification processing of differential signals, and the high input impedance characteristic of the following amplifiers can effectively isolate the influence of a signal processing circuit on the bridge and simultaneously realize amplification processing of two paths of output voltage signals of the Wheatstone bridge;
voltage signals of B, D two points output by the bridge are followed and amplified, and an obtained output signal F, E is filtered by capacitors C1 and C2 to form a stable direct current signal;
the input switching module comprises a switching chip and a control circuit, the switching module is controlled by a fixed frequency control signal output by the control circuit to realize the switching of F, E two paths of signals and simultaneously complete the alternating current conversion of differential signals output by a Wheatstone bridge, the fixed frequency control signal is generated by a fixed frequency crystal oscillator (such as 32.768 KHz) to generate an oscillation signal, and the oscillation signal is output to the switching chip after being shaped to realize the control of the switching chip;
the differential amplifier is used for amplifying the signal output by the switching chip, the input signal of the differential amplification chip is converted into a sinusoidal signal under the combined action of the switching signal and the capacitor, and the maximum amplification factor is determined by the differential amplifier according to the copy of the full-amplitude signal output by the bridge, so that the maximum amplitude of the amplified sinusoidal signal is within 1V from peak to peak, and the output of the output signal of the Wheatstone bridge is not distorted after amplification;
the driving power supply voltage module is mainly used for a circuit power supply system, and an amplifier, a fixed frequency oscillator, a switching chip, a square wave-to-sine wave circuit, a differential amplification circuit and the like in the system are all powered by the input power supply, so that the complexity of a detection circuit is reduced;
after the detection circuit starts to supply power, the whole circuit starts to work, in order to enable the fixed frequency oscillator to output a control signal with stable frequency and reduce the influence of temperature change of a bridge circuit on a bridge circuit acquisition signal after power-on, a system needs to wait for a certain time before starting to work normally and then starts to output an effective acquisition signal;
the bridge circuit is electrified, after the conversion, the output signal is a sine wave signal with fixed frequency after being symmetrically amplified, and in the subsequent signal processing and acquisition process, phase-locked amplification or a related detection circuit is used for signal extraction, so that the anti-interference capability of the output signal is greatly improved.
2. The wheatstone bridge based anti-interference detection circuit according to claim 1, wherein the switching control circuit selects a quartz crystal oscillator (e.g. 32.768 KHz) with high stability as an oscillation source, thereby ensuring that the signal output frequency has high frequency stability.
3. An oscillator for switching control frequencies according to claim 1 or 2, wherein the frequency range is controlled within a certain range, when the frequency is too high, the sinusoidal characteristic of the output signal is not easily ensured, when the frequency is too low, the subsequent detection circuit has slow response to the change of the signal, and the frequency range is selected from 10KHz to 100KHz, such as 32.768 KHz.
4. The Wheatstone bridge-based anti-interference detection circuit according to claim 1, 2 or 3, wherein the output differential signal of the bridge is subjected to following the amplified voltage difference VFE, and then a change signal with a voltage change between + VFE and-VFE is formed by switching the control circuit, and the fluctuation amplitude of the signal is increased by 2 times VFE from the original VFE, thereby increasing the amplitude of the differential signal.
5. The Wheatstone bridge-based immunity detection circuit according to any one of claims 1 to 4, wherein said circuit output signal is an output signal with a fixed frequency and a large output amplitude, so that the circuit has a large improvement in output line and internal immunity.
6. An anti-interference detection method based on a Wheatstone bridge is characterized by comprising the following steps:
the Wheatstone bridge detection circuit supplies power by using a direct current UI power supply mode, and a direct current power supply respectively supplies power to the bridge, the amplifying circuit, the oscillator and the switching chip after entering the bridge and the circuit;
in the initial working stage, because the bridge generates heat and the oscillator needs a certain time to stabilize, the circuit output signal in the time needs to be acquired after the circuit is stabilized;
the following amplification circuit carries out following amplification processing on output voltages VB and VD of the Wheatstone bridge, and the isolation between the detection circuit and the bridge is ensured, so that the influence of the detection circuit on the stability of the bridge circuit is reduced;
the output voltage signals VE and VF of the following amplifying circuit are connected to the input end of the switching circuit and used as input signals of the differential amplifier;
the control signal output by the oscillator realizes the control of the signal path state of the switching chip, and the high and low levels control the two path states of the switching chip;
when the control signal of the switching circuit is in one level, the input of the differential amplifier is a positive terminal VE and a negative terminal VF, and conversely, when the control signal is in another level state, the input signals of the differential amplifier are interchanged, namely VE is converted into VF and VF is converted into VE;
after the input signal of the differential amplifier is switched, the input signal is converted into a sinusoidal signal with a corresponding frequency under the action of the capacitors C1 and C2.
7. The Wheatstone bridge-based interference rejection detection method according to claim 6, wherein said method further comprises:
according to the processed transform circuit, the differential amplifier outputs an amplitude amplified sinusoidal signal with a stable frequency.
8. The Wheatstone bridge-based anti-interference detection method according to claim 6 or 7, wherein the amplitude of the sinusoidal signal is increased to about 1V peak-to-peak under the condition that the Wheatstone bridge circuit outputs full scale, thereby improving the anti-interference capability during signal transmission.
9. The Wheatstone bridge-based immunity detection system according to claim 6 or 7, wherein the switching circuit is capable of increasing the amplitude of the output signal change while performing the signal switching change.
10. A wheatstone bridge based interference rejection method according to any one of claims 6 to 9, wherein all of the bridges and the processing circuit are powered by a unified driving power supply.
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| CN112504413A (en) * | 2020-11-25 | 2021-03-16 | 西南科技大学 | Full-digitalization conversion method and device for six-component balance bridge detection |
| CN112504619A (en) * | 2020-11-25 | 2021-03-16 | 西南科技大学 | Balance S/N phase-locked amplification detection system and method of six-component balance bridge |
| CN112556943A (en) * | 2020-12-10 | 2021-03-26 | 北京精密机电控制设备研究所 | Water leakage positioning detection device |
| CN113567781A (en) * | 2021-07-17 | 2021-10-29 | 深圳市志奋领科技有限公司 | Anti-interference method and system for photoelectric sensor |
| CN115372408A (en) * | 2022-08-08 | 2022-11-22 | 东南大学 | Automatic 3 omega test system and method based on bridge and data acquisition card |
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| CN112504413A (en) * | 2020-11-25 | 2021-03-16 | 西南科技大学 | Full-digitalization conversion method and device for six-component balance bridge detection |
| CN112504619A (en) * | 2020-11-25 | 2021-03-16 | 西南科技大学 | Balance S/N phase-locked amplification detection system and method of six-component balance bridge |
| CN112504413B (en) * | 2020-11-25 | 2022-03-22 | 西南科技大学 | Full-digitalization conversion method and device for six-component balance bridge detection |
| CN112504619B (en) * | 2020-11-25 | 2022-05-06 | 西南科技大学 | Balance S/N phase-locked amplification detection system and method of six-component balance bridge |
| CN112556943A (en) * | 2020-12-10 | 2021-03-26 | 北京精密机电控制设备研究所 | Water leakage positioning detection device |
| CN112556943B (en) * | 2020-12-10 | 2022-10-21 | 北京精密机电控制设备研究所 | Water leakage positioning detection device |
| CN113567781A (en) * | 2021-07-17 | 2021-10-29 | 深圳市志奋领科技有限公司 | Anti-interference method and system for photoelectric sensor |
| CN115372408A (en) * | 2022-08-08 | 2022-11-22 | 东南大学 | Automatic 3 omega test system and method based on bridge and data acquisition card |
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