CN111803069A - Self-adaptive dynamic gain adjustment pressure distribution measuring system - Google Patents
Self-adaptive dynamic gain adjustment pressure distribution measuring system Download PDFInfo
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- CN111803069A CN111803069A CN202010798314.6A CN202010798314A CN111803069A CN 111803069 A CN111803069 A CN 111803069A CN 202010798314 A CN202010798314 A CN 202010798314A CN 111803069 A CN111803069 A CN 111803069A
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- 238000005259 measurement Methods 0.000 claims description 16
- 230000003044 adaptive effect Effects 0.000 claims description 13
- 238000013459 approach Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 description 3
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- 238000009530 blood pressure measurement Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1036—Measuring load distribution, e.g. podologic studies
- A61B5/1038—Measuring plantar pressure during gait
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0015—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by features of the telemetry system
- A61B5/002—Monitoring the patient using a local or closed circuit, e.g. in a room or building
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/662—Multiplexed conversion systems
Abstract
The invention discloses a self-adaptive dynamic gain adjustment pressure distribution measuring system which comprises a pressure array sensor module, a single-channel digital-to-analog conversion module, a filtering amplification module and a controller module, wherein the controller module comprises an analog-to-digital conversion circuit, the pressure array sensor module is a pressure resistance sensor which is arranged in rows and columns and used for measuring static pressure or dynamic pressure, the single-channel digital-to-analog conversion module is configured to receive instructions of the controller module and output corresponding voltage signals to the input end of the pressure array sensor module according to the instructions, the pressure array sensor module is configured to send the measured pressure signals to the analog-to-digital conversion circuit of the controller module through the filtering amplification module, and the controller module is configured to judge whether the amplitude of the voltage signals output by the single-channel digital-to-analog conversion module needs to be reduced or not. The invention does not increase hardware cost obviously while improving the frame rate, avoids gain errors among a plurality of sensors and meets the electrical safety requirement.
Description
Technical Field
The invention relates to the technical field of biological feature recognition, in particular to a self-adaptive dynamic gain adjustment pressure distribution measuring system.
Background
The plantar pressure is an important index in gait analysis, and the plantar pressure measurement can acquire physiological and pathological mechanical parameters of a human body in different body states and can become an important means for diagnosing special diseases and evaluating clinical rehabilitation.
The pressure sensor is used for measuring the sole pressure, and the pressure of each position of the sole needs to be detected in different states of standing still, walking and the like, and signals are transmitted to a computer for analysis and display, so that clinical evaluation is carried out. Pressure sensors are also commonly used for sitting posture detection or sleep state detection. Generally, pressure sensors have a low dynamic range, and if the pressure borne by the sensors exceeds the dynamic range of the sensors, errors occur in output results, so that errors occur in measurement results, and evaluation are affected.
Conventional pressure force measuring boards often use piezoresistive sensors, which are arranged in 52 rows × 44 columns, for example, 2288 sensors, and each square centimeter has 4 sensors, and the pressure signals are detected by means of row-column scanning to form a pressure image. When the pressure sensor is applied to plantar pressure detection, the pressure change of plantar touchdown in static (standing) or dynamic (running, jumping and the like) can be detected, and the pressure sensor is widely applied to the fields of rehabilitation, sports medicine, physical training and the like.
The prior art has the following problems:
1. the scanning frame rate is low, so that key information is easy to miss, and especially for high-speed motions such as running and jumping;
2. the sensor has a certain dynamic range, when the amplifier adopts a fixed gain, the output signal is often saturated for a subject with larger weight, and if the gain is reduced, the output signal is too small for the subject with smaller weight, and the pressure change cannot be accurately detected. The prior art adopts a method for adjusting the gain of the amplifier to avoid the problem, but the number of amplifier channels is large, the gain adjustment between the channels is easy to have errors, and the cost is high.
3. When the device is used as a human body test device, the electrical safety requirement is high.
Therefore, those skilled in the art are dedicated to develop an adaptive dynamic gain adjustment pressure distribution measurement system, which does not increase hardware cost significantly while increasing frame rate, avoids gain errors among multiple sensors, and meets the electrical safety requirements of human body data acquisition equipment.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is how to provide a self-adaptive dynamic gain adjustment pressure distribution measurement system, which does not increase hardware cost significantly while increasing frame rate, avoids gain errors among multiple sensors, and meets the electrical safety requirements of human body data acquisition equipment.
In order to achieve the above object, the present invention provides an adaptive dynamic gain adjustment pressure distribution measurement system, which includes a pressure array sensor module, a single-channel digital-to-analog conversion module, a filtering amplification module, and a controller module, wherein the controller module includes an analog-to-digital conversion circuit, the pressure array sensor module is a pressure resistance sensor arranged in rows and columns for measuring static pressure or dynamic pressure, the single-channel digital-to-analog conversion module is configured to receive an instruction from the controller module and output a corresponding voltage signal to an input end of the pressure array sensor module according to the instruction, the pressure array sensor module is configured to send the measured pressure signal to the analog-to-digital conversion circuit of the controller module through the filtering amplification module, and the controller module is configured to determine whether to reduce the amplitude of the voltage signal output by the single-channel digital-to-analog conversion module according to the amplitude of the received pressure signal, when the pressure signal amplitude approaches or reaches saturation, the controller module sends an instruction to the single-channel digital-to-analog conversion module to reduce the voltage signal amplitude output by the single-channel digital-to-analog conversion module.
Further, the controller module is further configured to determine whether the voltage signal amplitude output by the single-channel digital-to-analog conversion module needs to be increased according to the received pressure signal amplitude, and when the pressure signal amplitude is small, the controller module sends an instruction to the single-channel digital-to-analog conversion module to increase the voltage signal amplitude output by the single-channel digital-to-analog conversion module.
The input end of the single-channel digital-to-analog conversion module is connected to the controller module, the single-channel digital-to-analog conversion module is configured to output an analog signal according to an instruction of the controller module and send the analog signal to the input common end of the row scanning switch module, the output end of the row scanning switch module is connected to the input end of the pressure array sensor module, the output end of the pressure array sensor module is connected to the input end of the filtering and amplifying module, and the output end of the filtering and amplifying module is connected to the analog-to-digital conversion circuit of the controller module through the row scanning switch module.
Furthermore, the single-channel digital-to-analog conversion circuit further comprises a single-channel driving module, wherein the single-channel driving module is connected between the output end of the single-channel digital-to-analog conversion module and the input common end of the line scanning changeover switch module so as to improve the load carrying capacity of the single-channel digital-to-analog conversion module.
Further, the intelligent control system also comprises an upper computer module, wherein the upper computer module is connected with the controller module through wired or wireless communication.
Further, the system also comprises an isolation communication module and an isolation power module, wherein the isolation communication module is used for isolation communication between the controller module and the upper computer module, and the isolation power module is used for providing an isolation power supply for the system except the upper computer module.
Further, the isolation power supply module is powered by the upper computer module.
The controller module comprises a serial communication circuit, and the upper computer module is in communication connection with the serial communication circuit of the controller module through the USB-serial port conversion module.
Further, the isolation communication module is disposed between the serial communication circuit of the controller module and the USB-serial port conversion module.
The invention has the beneficial effects that:
(1) the frame rate can be increased from 60Hz to 140Hz without increasing hardware cost significantly.
(2) The single-path digital-to-analog converter (DAC) is used for adaptively controlling the signal sensitivity of the sensor, the cost is low, the gain error among a plurality of sensors is avoided, and the effect is good.
(3) The isolation communication module and the isolation power supply are adopted, and the electrical safety requirements of the human body data acquisition equipment are met.
Drawings
FIG. 1 is a functional block diagram of a pressure distribution measurement system in accordance with a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of an amplifier in the filtering and amplifying module according to a preferred embodiment of the invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The invention provides a self-adaptive dynamic gain adjustment pressure distribution measuring system which can be used for evaluating and training the actions of people and mammals in medical institutions, sports training institutions, scientific research institutions and the like.
Example 1
As shown in fig. 1, the pressure distribution measurement system is composed of a pressure array sensor module 1, a line scanning switch module 2, a column scanning switch module 3, a single-channel digital-to-analog conversion module 4, a single-channel driving module 5, a filtering amplification module 6, a controller module 7, and an upper computer module 8.
The pressure array sensor module 1 is composed of piezoresistive sensors 11 arranged (m rows × n columns) for measuring static pressure or dynamic pressure. The pressure array sensor module 1 is matched with the line scanning change-over switch module 2 and the column scanning change-over switch module 3, and a pressure signal measured by the pressure resistance sensor 11 is sent to the controller module 7 by adopting a line scanning mode and a column scanning mode. The piezoresistive sensor 11 is not limited in size and shape, and can be placed on the ground, a seat or a bed, or placed on the sole of a foot to follow the movement of a walker, so that static pressure and dynamic pressure can be measured.
In this embodiment, the row scan switch module 2 and the column scan switch module 3 are a plurality of single-pole multi-throw high-speed analog switchesThe single-channel digital-to-analog conversion (DAC) module 4 adopts an AD5300 high-speed serial digital-to-analog converter, and the single-channel driving module 5 is a voltage follower circuit formed by a single-channel operational amplifier and is used for improving the load capacity of the single-channel DAC module 4. The filtering and amplifying module 6 is composed of a low-noise high-performance amplifier circuit with RC low-pass filtering, and can filter out switching noise possibly caused by a high-speed switch, so that the switch is allowed to switch at a high speed, and the scanning frame rate is improved. The controller module 7 adopts an Atmel ATxMega256 high-performance Microcontroller (MCU) which is internally provided with a multi-channel (16-channel) analog-to-digital conversion (ADC) circuit 71 and a serial communication circuit 72 (USART, I)2C and SPI). The controller module 7 outputs instructions to control the line scanning switch module 2 to select one line to be measured from the m lines of piezoresistive sensors 11. Each of the line pressure resistance sensors 11 is connected with each filter amplifying circuit in the filter amplifying module 6 in turn. Generally, the number n of columns of the piezoresistive sensors 11 is greater than the number of channels of the ADC circuit 71 in the MCU (the microcontroller in this embodiment is a 16-channel ADC), at this time, the piezoresistive sensors 11 are divided into a plurality of groups by columns (each group simultaneously outputs 16 signals), and the controller module 7 outputs an instruction to control the column scan switch module 3 to input the n columns of piezoresistive sensors 11 into the ADC circuit 71 in the controller module 7 by groups. The embodiment can remarkably improve the scanning frame rate, and simultaneously does not remarkably increase the hardware cost, and the scanning frame rate can be improved from 60Hz to 140 Hz.
Because human body data acquisition equipment has high requirements on electrical safety, an isolation communication module 91 and an isolation power supply module 92 are adopted in the embodiment. The isolation communication module 91 can adopt a photoelectric isolation circuit, and the isolation power module 92 can adopt a transformer isolation circuit, so that the requirements of miniaturization and safety of human body data acquisition equipment are met.
A high-speed USB-serial port conversion communication module 10 is adopted between the upper computer module 8 and the isolation communication module 91, so that USB communication signals can be converted into serial communication signals (I) required by the MCU2C and SPI). When the isolated communication module 91 is not used, the high-speed USB-serial port conversion communication module 10 is directly placed on the serial ports of the upper computer module 8 and the controller module 7Between the communication circuits 72.
In the embodiment, the signal sensitivity of the pressure sensor is adaptively controlled by only dynamically and adaptively adjusting the output amplitude (the signal amplitude of the driving module) of the single-channel DAC module instead of adjusting the gains of a plurality of amplifiers, so that the cost is low, the gain error among a plurality of sensors is avoided, and the effect is good.
As shown in FIG. 2, the voltage output by the controller module via the single-channel DAC module and the driver module
By line scanning change-over switch, pressure resistance sensor
A resistor connected to the inverting input terminal of the operational amplifier and the non-inverting input terminal of the operational amplifier being grounded
The output end of the operational amplifier is transmitted to an analog-to-digital conversion circuit of the microcontroller through the column scanning change-over switch. Voltage signal to microcontroller due to operational amplifier ' virtual ground ' and ' virtual short
Comprises the following steps:
therefore, when the pressure is large, the pressure is large
Very small by reducing the adaptive control signal
Can reduce
So as not to saturate;on the contrary, when the pressure is very small, it causes
At large, by increasing the adaptive control signal
Can be increased
Making the system more sensitive.
As shown in fig. 1, the controller module 7 may send the pressure digital signal to the upper computer module 8 through the serial communication circuit 72 for data processing, and the upper computer module 8 controls the output voltage amplitude of the DAC through communication with the controller module 7 according to the pressure, so as to automatically adjust the gain and ensure correct measurement of the pressure value. When the amplitude of the pressure signal is close to or reaches saturation, the upper computer module 8 sends a gain reduction instruction to the controller module 7, and the controller module 7 sends an instruction to the single-channel DAC module 4 to reduce the amplitude of the voltage signal output by the single-channel DAC module; when the pressure signal amplitude is small, the upper computer module 8 sends a gain increasing instruction to the controller module 7, and the controller module 7 sends an instruction to the single-channel DAC module 4 to increase the amplitude of the voltage signal output by the single-channel DAC module, so that the pressure array sensor module 1 can normally detect the pressure.
Example 2
In this embodiment, the upper computer module 8 further includes a first wireless communication module, a signal processing module, and a signal display module, and is configured to receive, process, and display the pressure signal wirelessly. The controller module 7 further comprises a second wireless communication module for wirelessly transmitting the pressure signal. The wireless communication module realizes wireless communication between the upper computer module 8 and the controller module 7 by using technologies such as WiFi, ZigBee and Bluetooth.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. An adaptive dynamic gain adjustment pressure distribution measurement system, which comprises a pressure array sensor module, a single-channel digital-to-analog conversion module, a filtering amplification module and a controller module, wherein the controller module comprises an analog-to-digital conversion circuit, the pressure array sensor module is a pressure resistance sensor arranged in rows and columns and used for measuring static pressure or dynamic pressure, the single-channel digital-to-analog conversion module is configured to receive an instruction of the controller module and output a corresponding voltage signal to an input end of the pressure array sensor module according to the instruction, the pressure array sensor module is configured to send the measured pressure signal to the analog-to-digital conversion circuit of the controller module through the filtering amplification module, the controller module is configured to judge whether the amplitude of the voltage signal output by the single-channel digital-to-analog conversion module needs to be reduced according to the amplitude of the received pressure signal, when the pressure signal amplitude approaches or reaches saturation, the controller module sends an instruction to the single-channel digital-to-analog conversion module to reduce the voltage signal amplitude output by the single-channel digital-to-analog conversion module.
2. The adaptive dynamic gain adjustment pressure profile measurement system of claim 1, wherein the controller module is further configured to determine whether an increase in the voltage signal amplitude output by the single channel digital-to-analog conversion module is required based on the received pressure signal amplitude, and when the pressure signal amplitude is small, the controller module issues a command to the single channel digital-to-analog conversion module to increase the voltage signal amplitude output by the single channel digital-to-analog conversion module.
3. The adaptive dynamic gain adjustment pressure profile measurement system of claim 1, further comprising a line scan switcher module and a column scan switcher module, wherein the single channel digital-to-analog conversion module input is coupled to the controller module, the single channel digital-to-analog conversion module is configured to output an analog signal according to the controller module command and to the line scan switcher module input common, the line scan switcher module output is coupled to the pressure array sensor module input, the pressure array sensor module output is coupled to the filter amplifier module input, and the filter amplifier module output is coupled to the analog-to-digital conversion circuit of the controller module through the column scan switcher module.
4. The adaptive dynamic gain adjustment pressure profile measurement system of claim 3, further comprising a single channel drive module connected between the single channel digital-to-analog conversion module output and the line scan switcher module input common to increase the load capacity of the single channel digital-to-analog conversion module.
5. The adaptive dynamic gain modulated pressure profile measurement system of claim 1, further comprising an upper computer module, the upper computer module and the controller module connected by wired or wireless communication.
6. The adaptive dynamic gain adjustment pressure profile measurement system of claim 5, further comprising an isolated communication module for isolated communication between the controller module and the upper computer module and an isolated power module for providing isolated power to portions of the system other than the upper computer module.
7. The adaptive dynamic gain adjusted pressure profile measurement system of claim 6, wherein the isolated power module is powered by the upper computer module.
8. The adaptive dynamic gain adjustment pressure profile measurement system of claim 6, further comprising a USB-to-serial conversion module, wherein the controller module comprises a serial communication circuit, and the upper computer module is communicatively coupled to the serial communication circuit of the controller module via the USB-to-serial conversion module.
9. The adaptive dynamic gain adjustment pressure profile measurement system of claim 8, wherein the isolation communication module is disposed between the serial communication circuit of the controller module and the USB-to-serial port conversion module.
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| CN202010798314.6A CN111803069A (en) | 2020-08-11 | 2020-08-11 | Self-adaptive dynamic gain adjustment pressure distribution measuring system |
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| CN202010798314.6A CN111803069A (en) | 2020-08-11 | 2020-08-11 | Self-adaptive dynamic gain adjustment pressure distribution measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285718A (en) * | 2021-04-09 | 2021-08-20 | 西安电子科技大学 | Sensor analog front-end circuit |
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| CN106768530A (en) * | 2017-02-17 | 2017-05-31 | 安图实验仪器(郑州)有限公司 | Pressure detecting system based on gain-programmed amplifier |
| CN106773947A (en) * | 2016-12-12 | 2017-05-31 | 恒信大友（北京）科技有限公司 | A kind of novel high speed Dynamic High-accuracy data acquisition device and method |
| CN107526993A (en) * | 2016-06-20 | 2017-12-29 | 康达生命科学有限公司 | Capacitive fingerprint sensing device |
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2020
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|---|---|---|---|---|
| US6032109A (en) * | 1996-10-21 | 2000-02-29 | Telemonitor, Inc. | Smart sensor module |
| CN101057249A (en) * | 2004-09-22 | 2007-10-17 | 丁玉明 | Apparatus for fingerprint sensing and other measurements |
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| CN113285718B (en) * | 2021-04-09 | 2023-04-07 | 西安电子科技大学 | Sensor analog front-end circuit |
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