CN-122015629-A - Master-slave dual-channel continuous measurement system and method for same strain resistor

CN122015629ACN 122015629 ACN122015629 ACN 122015629ACN-122015629-A

Abstract

The invention discloses a master-slave dual-channel continuous measurement system and a method for the same strain resistor, wherein the master-slave dual-channel continuous measurement system and the method comprise a master processing unit and at least two sensing units, the at least two sensing units are electrically connected to the same strain resistor together, the sensing units are used for applying constant-current excitation to the strain resistor and collecting voltage signals generated by the strain resistor, the master processing unit is used for providing working power supplies for the sensing units, processing measurement signals from the sensing units and sending the processed measurement data to an external terminal. The invention synchronously measures the same strain resistance through at least two measuring channels, and realizes the comparison, verification or joint treatment of measuring results, thereby improving the stability and reliability in the continuous measuring process.

Inventors

ZHAO XING
YAN YUJIE
ZHANG XUEFENG
XU HAO
YU LIXIA
CHEN QIANMING

Assignees

四川大学

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (10)

1. The master-slave dual-channel continuous measurement system for the same strain resistor is characterized by comprising a master processing unit and at least two sensing units, wherein the at least two sensing units are electrically connected to the same strain resistor sensor together, the sensing units are used for applying constant-current excitation to the strain resistor and collecting voltage signals generated by the strain resistor, the master processing unit is used for providing working power supply for each sensing unit, processing measurement signals from the sensing units and sending the processed measurement data to an external terminal.
2. The master-slave dual-channel continuous measurement system for the same strain resistor of claim 1, wherein the main processing unit comprises a power module, an analog-to-digital conversion module and a master control processing and wireless communication module, wherein the power module provides stable working voltage for each module of the system, the analog-to-digital conversion module is used for sampling analog voltage signals output by the sensing unit and digitizing the analog signals, and the master control processing and wireless communication module is used for filtering, converting and managing sampled data and transmitting the processed data to an external terminal in a wireless communication mode.
3. The master-slave dual-channel continuous measurement system for the same strain resistor according to claim 2, wherein the sensing unit comprises a constant current source module, a strain resistor sensor and a signal amplification module, wherein the constant current source module is used for applying stable micro-current excitation to the strain resistor, the strain resistor sensor is used for sensing external deformation and generating resistance change, and the signal amplification module is used for amplifying weak voltage signals generated by the strain resistor.
4. The master-slave dual-channel continuous measurement system for the same strain resistor of claim 2, wherein the analog-to-digital conversion module adopts a high-precision analog-to-digital converter, the master control processing and the wireless communication module are realized based on a microcontroller with wireless communication capability, and the wireless communication mode is Bluetooth communication.
5. The master-slave dual channel continuous measurement system for the same strain resistance of claim 2 wherein the power module supports an external power source or a portable power source input.
6. The master-slave dual-channel continuous measurement system for the same strain resistor of claim 3, wherein the constant current source module is realized based on an adjustable constant current source device, and the signal amplification module adopts an instrument amplifier structure.
7. The master-slave dual-channel continuous measurement system for the same strain resistor of claim 1, wherein the master processing unit is arranged at a non-sensing part of the system in a centralized arrangement mode, and the sensing units are connected with the master processing unit through wires or cables to realize power supply and analog signal transmission.
8. The master-slave dual-channel continuous measurement system for the same strain resistor of claim 7, wherein the system is of a headphone structure and comprises a head beam, a left ear cup and a right ear cup which are respectively arranged at two ends of the head beam, the main processing unit is arranged on the head beam, and the sensing units are respectively arranged in the left ear cup and the right ear cup.
9. The master-slave type double-channel continuous measurement method for the same strain resistor is applied to the master-slave type double-channel continuous measurement system for the same strain resistor according to any one of claims 1-8, and is characterized by comprising the following steps: s1, constant current excitation, wherein preset micro-current is applied to the same strain resistor through at least two sensing units; s2, collecting signals, namely collecting voltage signals generated by the strain resistor under constant current excitation; S3, amplifying signals, namely amplifying voltage signals at two ends of the strain resistor through a signal amplifying module of each sensing unit; S4, analog-to-digital conversion, wherein the analog-to-digital conversion module of the main processing unit is used for carrying out high-precision sampling and analog-to-digital conversion on the amplified voltage signal; And S5, data processing and transmission, filtering and converting the sampled data through a main control processing and wireless communication module of the main processing unit to obtain a real-time resistance value, and simultaneously carrying out consistency analysis, difference calculation or joint processing on the sampled data from a plurality of sensing units, and sending the processed measured data to an external terminal in a wireless communication mode.
10. The master-slave dual-channel continuous measurement method for the same strain resistor according to claim 9 is characterized in that the preset micro-current in the step S1 is 0.9 mu A, the resolution of the analog-to-digital conversion in the step S4 is 24 bits, the sampling data processing is carried out in the step S5 by adopting a multiple average filtering mode, and the wireless communication mode adopts a Bluetooth low-power consumption communication mode.

Description

Master-slave dual-channel continuous measurement system and method for same strain resistor Technical Field The invention relates to the technical field of strain measurement and wireless data acquisition, in particular to a master-slave dual-channel continuous measurement system and method for the same strain resistor. Background The existing wireless strain measurement system mostly adopts a distributed structure, namely, each strain sensor integrates an independent signal conditioning module, an independent power supply module and an independent wireless communication module and respectively measures corresponding to different strain resistors. The scheme can realize multi-point measurement, but cannot be used for multi-channel synchronous measurement and consistency verification of the same strain resistor, is easily influenced by wire resistance, temperature drift and power supply noise in the continuous measurement process, and has insufficient measurement accuracy on tiny resistance change. In addition, the distributed wireless sensor has a complex structure and high power consumption, and is unfavorable for miniaturization and long-term continuous monitoring. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a master-slave type multi-channel continuous measurement system and a master-slave type multi-channel continuous measurement method for the same strain resistor, which are used for synchronously measuring the same strain resistor through at least two measurement channels, so that the comparison, verification or joint treatment of measurement results is realized, and the stability and reliability in the continuous measurement process are improved. In order to achieve the technical purpose, the invention adopts the following technical scheme: The master-slave type double-channel continuous measurement system for the same strain resistor comprises a master processing unit and at least two sensing units, wherein the at least two sensing units are electrically connected to the same strain resistor sensor together, the sensing units are used for applying constant-current excitation to the strain resistor and collecting voltage signals generated by the constant-current excitation, the master processing unit is used for providing working power supply for each sensing unit, processing measurement signals from the sensing units and sending the processed measurement data to an external terminal. The main processing unit comprises a power module, an analog-to-digital conversion module and a main control processing and wireless communication module, wherein the power module provides stable working voltage for each module of the system, the analog-to-digital conversion module is used for sampling analog voltage signals output by the sensing unit and digitizing the analog signals, and the main control processing and wireless communication module is used for filtering, converting and managing sampled data and transmitting the processed data to an external terminal in a wireless communication mode. The sensing unit comprises a constant current source module, a strain resistor sensor and a signal amplifying module, wherein the constant current source module is used for applying stable microcurrent excitation to the strain resistor, the strain resistor sensor is used for sensing external deformation and generating resistance change, and the signal amplifying module is used for amplifying weak voltage signals generated by the strain resistor. Preferably, the analog-to-digital conversion module adopts a high-precision analog-to-digital converter, the main control processing and the wireless communication module are realized based on a microcontroller with wireless communication capability, and the wireless communication mode is Bluetooth communication. Preferably, the power module supports an external power source or a portable power input. Preferably, the constant current source module is realized based on an adjustable constant current source device, and the signal amplification module adopts an instrument amplifier structure. Furthermore, the main processing unit is arranged at a non-sensing part of the system in a centralized mode, and each sensing unit is connected with the main processing unit through a wire or a cable to realize power supply and analog signal transmission. Preferably, the system is in a headphone structure and comprises a head beam, a left ear cup and a right ear cup which are respectively arranged at two ends of the head beam, the main processing unit is arranged on the head beam, and the sensing units are respectively arranged in the left ear cup and the right ear cup. The master-slave type double-channel continuous measurement method for the same strain resistor is applied to the master-slave type double-channel continuous measurement system for the same strain resistor, and comprises the following steps: s1, constant current excitation, wherein