Old man's amount of exercise analytic system
阅读说明：本技术 一种老人运动量分析系统 (Old man's amount of exercise analytic system ) 是由 林爱琴 杨少龙 寿雨薇 杨兵 张希 陈莹莹 于 2019-11-07 设计创作，主要内容包括：本发明提供一种老人运动量分析系统,其包括鞋垫、充电接口、重置按钮、数据接口、外部设备、压力传感器、信号处理电路、中央处理装置、数据分析模块、振动单元、步数比较模块、步数计数单元、站立计时单元、站立比较单元、无线传输模块、第一报警单元以及第二报警单元,其通过压力传感器和信号处理电路能够精确获取鞋垫底部所受压力,数据分析模块根据接收到的压力信号分析老人是正在行走还是站立,且通过步数计数单元和站立计时单元计算老人步行步数和站立时间,再老人站立时振动单元开始根据预设数据发处振动以对老人脚底进行按摩。(The invention provides an old man exercise amount analysis system which comprises an insole, a charging interface, a reset button, a data interface, external equipment, a pressure sensor, a signal processing circuit, a central processing unit, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit.)
1. The system for analyzing the amount of exercise of the old people is characterized by comprising an insole (1), a charging interface (2), a reset button (3), a data interface (4), external equipment, a pressure sensor, a signal processing circuit, a central processing unit, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit;
the insole (1) is arranged at the bottom of a shoe, the charging interface (2), the reset button (3) and the data interface (4) are arranged on one side of the insole (1), the pressure sensor, the signal processing circuit, the central processing unit, the data analysis module, the vibration unit, the step number comparison module, the step number counting unit, the standing timing unit, the standing comparison unit and the wireless transmission module are arranged in the insole (1), and the first alarm unit and the second alarm unit are arranged in an old person's mobile phone; the external device is connected with the central processing unit through the data interface, the output end of the pressure sensor is connected with the input end of the signal processing circuit, the output end of the data interface and the output end of the signal processing circuit are both connected with the input end of the central processing unit, the output end of the central processing unit is connected with the input end of the data analysis module, the output end of the data analysis module is connected with the input end of the step counting unit, the output end of the data analysis module is connected with the input end of the standing timing unit, the output end of the step counting unit is connected with the input end of the step comparing module, the output end of the standing timing unit is connected with the input end of the standing comparing module, and the step comparing module is connected with the first alarm unit through the wireless transmission module, the standing comparison module is connected with the second alarm unit through the wireless transmission module, the output end of the data analysis module is connected with the input end of the vibration unit, and the input end of the step number comparison module, the input end of the standing comparison module and the input end of the vibration unit are connected with the output end of the central processing unit;
wherein, the old man charges for the old man's amount of exercise analytic system through the interface that charges (2), the old man passes through external equipment input old man's age, weight G, predetermine step number X every day, predetermine standing time T every day, the vibration frequency f of vibration unit and the vibration amplitude A of vibration unit, peripheral equipment passes through above-mentioned data interface (4) transmission to central processing unit, central processing unit will receive predetermine step number X every day and transmit to step number comparison module, central processing unit will receive predetermine standing time T every day and transmit to the comparison module of standing, central processing unit will receive the vibration frequency of vibration unit and the vibration amplitude of vibration unit transmit to the vibration unit, pressure sensor is used for gathering the pressure signal that shoe-pad (1) receives, the pressure signal is processed by the signal processing circuit and then transmitted to the central processing device, the central processing device transmits the received pressure signal to the data analysis module, the data analysis module analyzes the received pressure signal to judge whether the old man walks or stands at the moment, if the old man walks at the moment, the step counting unit carries out accumulated counting on the step number and transmits the accumulated counting value of the step number to the step number comparison unit, the step number comparison unit compares the received accumulated counting value of the step number with the preset step number X every day, if the step number comparison unit compares the received accumulated counting value of the step number with the preset step number X every day, the step number comparison unit triggers the first alarm unit to alarm through the wireless transmission module, and if the old man stands at the moment, the central processing unit controls the vibration unit to start vibration operation with the vibration frequency f and the vibration amplitude A of the vibration unit, meanwhile, the standing timing unit starts timing and transmits the accumulated count value of the standing time to the standing comparison unit, the standing comparison unit compares the received accumulated count value of the standing time with the preset standing time T every day, and if the standing comparison unit is larger than the received accumulated count value of the standing time than the preset standing time T every day, the standing comparison unit triggers the second alarm unit to alarm through the wireless transmission module.
2. The system for analyzing the amount of exercise of the elderly person according to claim 1, wherein the external device is a computer or a mobile phone.
3. The system for analyzing exercise amount of elderly people according to claim 1, wherein the data analysis module analyzes the received pressure signal to determine whether the elderly people are walking or standing, and the determination method comprises:
if the pressure signal received by the data analysis module is a continuously fluctuating signal near a preset pressure threshold value within a preset time, the data analysis module judges that the old man stands at the moment;
and if the pressure signal received by the data analysis module is a spike signal, the data analysis module judges that the old man is walking at the moment.
4. The elderly exercise amount analysis system according to claim 3, wherein the preset time is 10s, and the preset pressure threshold is a pressure threshold corresponding to the weight G of the elderly.
5. The system for analyzing the amount of exercise of old people according to claim 1, wherein the data resetting means of the system for analyzing the amount of exercise of old people is two kinds, the first is to manually reset the data inputted from the external device through the reset button (3), and the other is to reset the data within a preset time through the central processing unit.
6. The system for analyzing the amount of exercise of the elderly people according to claim 1, wherein the pressure sensor is used for collecting a pressure signal applied to the insole (1), converting the collected pressure signal into a voltage signal V0, and transmitting the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit comprises a signal amplifying unit and a signal filtering unit, an output end of the pressure sensor is connected with an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected with an input end of the signal filtering unit, and an output end of the signal filtering unit is connected with an input end of the central processing unit.
7. The elderly motion amount analysis system according to claim 6, wherein the signal amplification unit comprises an operational amplifier a1 and resistors R1-R9;
wherein, the output end of the pressure sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R9, one end of a resistor R8 is grounded, the other end of a resistor R8 is connected with one end of a resistor R6, the other end of a resistor R8 is further connected with one end of a resistor R7, the other end of a resistor R6 is connected with a direct current power supply Vref, the other end of a resistor R68628 is connected with one end of a resistor R4, the other end of a resistor R6 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with the other end of a resistor R1, the other end of a resistor R9 is connected with one end of a resistor R7, the other end of a resistor R9 is further connected with the other end of a resistor R8, the other end of the resistor R8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the other end of the operational amplifier A8, the other end of the operational, one end of the resistor R3 is grounded, the other end of the resistor R1 is connected with the other end of the resistor R3, the other end of the resistor R1 is also connected with the non-inverting input end of the operational amplifier A1, and the output end of the operational amplifier A1 is connected with the input end of the signal filtering unit.
8. The elderly motion amount analysis system according to claim 7, wherein the signal filtering unit comprises resistors R10-R13, capacitors C1-C5, and operational amplifiers a 2-A3;
wherein, the output end of the signal amplification unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R10, the other end of a capacitor C1 is further connected with one end of a capacitor C2, one end of a resistor R11 is connected with a direct current power supply Vref, the other end of a capacitor C2 is connected with the other end of a resistor R11, the other end of a capacitor C2 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R10 is connected with the inverting input end of the operational amplifier, the other end of a resistor R10 is connected with the output end of an operational amplifier A2, the output end of an operational amplifier 573A 2 is connected with one end of a resistor R12, the other end of a resistor R12 is connected with one end of a resistor R13, the other end of a resistor R12 is connected with one end of a capacitor C3, one end of a capacitor C4 is grounded, the other end of a capacitor C695, the other end of the capacitor C3 is connected with the inverting input end of the operational amplifier A3, the other end of the capacitor C3 is connected with the output end of the operational amplifier A3, the output end of the operational amplifier A3 is connected with one end of the capacitor C5, the other end of the capacitor C5 is connected with the input end of the central processing unit, and the signal filtering unit transmits a voltage signal V1 to the central processing unit.
Technical Field
The invention relates to the field of health monitoring, in particular to an analysis system for the amount of exercise of old people.
Background
The old people have functions of all system organs reduced, bones, muscles and joints aged, and improper selection of the motion mode is easy to cause damage. The sports popular with the elderly are taijiquan, walking, qigong, gymnastics, dancing and jogging. These items are all aerobic exercises. The exercise method for enhancing the functions of respiration and cardiovascular and improving the metabolic process has the advantages of low exercise intensity, long duration, safety, interest, convenience and feasibility, and is very suitable for the old.
Disclosure of Invention
Therefore, in order to overcome the above problems, the present invention provides an analysis system for the amount of exercise of the elderly, which comprises an insole, a charging interface, a reset button, a data interface, an external device, a pressure sensor, a signal processing circuit, a central processing unit, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit, the pressure sensor and the signal processing circuit can accurately acquire the pressure on the bottom of the insole, the data analysis module analyzes whether the old man is walking or standing according to the received pressure signal, and the walking step number and the standing time of the old are calculated through the step number counting unit and the standing timing unit, and then the vibration unit starts to vibrate according to preset data when the old stands so as to massage the soles of the feet of the old.
The invention provides an old people exercise amount analysis system which comprises an insole, a charging interface, a reset button, a data interface, external equipment, a pressure sensor, a signal processing circuit, a central processing unit, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit.
The insole is arranged at the bottom of the shoe, the charging interface, the reset button and the data interface are arranged on one side of the insole, the pressure sensor, the signal processing circuit, the central processing unit, the data analysis module, the vibration unit, the step number comparison module, the step number counting unit, the standing timing unit, the standing comparison unit and the wireless transmission module are arranged in the insole, and the first alarm unit and the second alarm unit are arranged in the old man's mobile phone; the external equipment is connected with the central processing unit through a data interface, the output end of the pressure sensor is connected with the input end of the signal processing circuit, the output end of the data interface and the output end of the signal processing circuit are both connected with the input end of the central processing unit, the output end of the central processing unit is connected with the input end of the data analysis module, the output end of the data analysis module is connected with the input end of the step number counting unit, the output end of the step number counting unit is connected with the input end of the step number comparison module, the output end of the standing timing unit is connected with the input end of the standing comparison module, the step number comparison module is connected with the first alarm unit through a wireless transmission module, the standing comparison module is connected with the second alarm unit through a wireless transmission module, and the output end of the data analysis module is connected with the input end of the vibration unit, the input end of the step number comparison module, the input end of the standing comparison module and the input end of the vibration unit are connected with the output end of the central processing unit.
Wherein, the old people charges the old people motion analysis system through the charging interface, the old people inputs the age, the weight G, the preset step number X every day, the preset standing time T every day, the vibration frequency f of the vibration unit and the vibration amplitude A of the vibration unit through the external equipment, the external equipment transmits the data to the central processing device through the data interface, the central processing device transmits the received preset step number X every day to the step number comparison module, the central processing device transmits the received preset standing time T every day to the standing comparison module, the central processing device transmits the received vibration frequency of the vibration unit and the vibration amplitude of the vibration unit to the vibration unit, the pressure sensor is used for collecting the pressure signal borne by the insole, the pressure signal is transmitted to the central processing device after being processed by the signal processing circuit, the central processing device transmits the received pressure signal to the data analysis module, the data analysis module analyzes the received pressure signal to judge whether the old man walks or stands at the moment, if the old man walks, the step counting unit carries out accumulated counting on the step number, the accumulated count value of the step number is transmitted to the step number comparison unit, the step number comparison unit compares the accumulated count value of the received step number with a preset step number X every day, if the step number comparison unit enables the accumulated count value of the received step number to be larger than the preset step number X every day, the step number comparison unit triggers the first alarm unit to give an alarm through the wireless transmission module, if the old man stands at the moment, the central processing device controls the vibration unit to start vibration operation with the vibration frequency f and the vibration amplitude A of the vibration unit, meanwhile, the standing timing unit starts timing, the accumulated count value of the standing time is transmitted to the standing comparison unit, and the standing comparison unit carries out the received accumulated count value of the standing time and the preset standing time T every day And comparing, if the standing comparison unit receives the accumulated count value of the standing time which is larger than the preset standing time T every day, the standing comparison unit triggers the second alarm unit to alarm through the wireless transmission module.
Wherein, the external equipment is a computer or a mobile phone.
The data analysis module analyzes the received pressure signal to judge whether the old man is walking or standing at the moment, and the judging method comprises the following steps:
if the pressure signal received by the data analysis module is a continuously fluctuating signal near a preset pressure threshold value within a preset time, the data analysis module judges that the old man stands at the moment;
if the pressure signal received by the data analysis module is a peak signal, the data analysis module judges that the old man is walking at the moment.
The preset time is 10s, and the preset pressure threshold is a pressure threshold corresponding to the weight G of the old people.
The data resetting mode of the old people motion quantity analysis system comprises two modes, wherein the first mode is that data input by external equipment is manually reset through a resetting button, and the other mode is that the data are reset in preset time through a central processing unit.
The pressure sensor is used for collecting pressure signals borne by the insole, converting the collected pressure signals into voltage signals V0, transmitting the voltage signals V0 to the signal processing circuit, the voltage signals V1 are the voltage signals processed by the signal processing circuit, the signal processing circuit comprises a signal amplification unit and a signal filtering unit, the output end of the pressure sensor is connected with the input end of the signal amplification unit, the output end of the signal amplification unit is connected with the input end of the signal filtering unit, and the output end of the signal filtering unit is connected with the input end of the central processing device.
The signal amplification unit comprises an operational amplifier A1 and resistors R1-R9.
Wherein, the output end of the pressure sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R9, one end of a resistor R8 is grounded, the other end of a resistor R8 is connected with one end of a resistor R6, the other end of a resistor R8 is further connected with one end of a resistor R7, the other end of a resistor R6 is connected with a direct current power supply Vref, the other end of a resistor R6 is connected with one end of a resistor R4, the other end of a resistor R6 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with the other end of a resistor R1, the other end of a resistor R9 is connected with one end of a resistor R7, the other end of a resistor R9 is further connected with the other end of a resistor R8, the other end of a resistor R8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the other end of the resistor R8, the other, one end of the resistor R3 is grounded, the other end of the resistor R1 is connected with the other end of the resistor R3, the other end of the resistor R1 is also connected with the non-inverting input end of the operational amplifier A1, and the output end of the operational amplifier A1 is connected with the input end of the signal filtering unit.
The signal filtering unit comprises resistors R10-R13, capacitors C1-C5 and operational amplifiers A2-A3.
Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R10, the other end of a capacitor C1 is further connected with one end of a capacitor C2, one end of a resistor R11 is connected with a direct current power supply Vref, the other end of a capacitor C2 is connected with the other end of a resistor R11, the other end of a capacitor C2 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R10 is connected with the inverting input end of an operational amplifier, the other end of a resistor R10 is connected with the output end of an operational amplifier A2, the output end of an operational amplifier A2 is connected with one end of a resistor R12, the other end of a resistor R12 is connected with one end of a resistor R13, the other end of a resistor R12 is connected with one end of a capacitor C3, one end of a capacitor C4 is grounded, the other end of a capacitor C695, the other end of the capacitor C3 is connected with the inverting input end of the operational amplifier A3, the other end of the capacitor C3 is connected with the output end of the operational amplifier A3, the output end of the operational amplifier A3 is connected with one end of the capacitor C5, the other end of the capacitor C5 is connected with the input end of the central processing unit, and the signal filtering unit transmits the voltage signal V1 to the central processing unit.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides an old man exercise amount analysis system which comprises an insole, a charging interface, a reset button, a data interface, external equipment, a pressure sensor, a signal processing circuit, a central processing device, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit.
(2) Because the signal collected by the pressure sensor is a weak voltage signal, the signal amplification unit amplifies the voltage V0 output by the pressure sensor through an operational amplifier A1 and resistors R1-R9, and the signal amplification unit consisting of the operational amplifier A1 and the resistors R1-R9 only has drift of 1.25 muV/DEG C, offset within 2 muV, 100pA bias current and noise of 5.25nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R10-R13, capacitors C1-C5 and an operational amplifier A2-A3 to filter the amplified electric signals, so that the pressure detection precision is improved.
Drawings
Fig. 1 is a structural view of an old man's exercise amount analyzing system of the present invention;
fig. 2 is a schematic diagram of an old person motion amount analysis system according to the present invention;
fig. 3 is a circuit diagram of a signal processing circuit according to the present invention.
Detailed Description
The following describes the system for analyzing the amount of exercise of the elderly person according to the present invention in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1-2, the system for analyzing the amount of exercise of the elderly provided by the present invention includes an insole 1, a charging interface 2, a
The insole 1 is arranged at the bottom of a shoe, the charging interface 2, the
Wherein, the old people charges the old people motion analysis system through the charging interface 2, the old people inputs the age, the weight G, the preset step number X every day, the preset standing time T every day, the vibration frequency f of the vibration unit and the vibration amplitude A of the vibration unit through the external equipment, the external equipment transmits the data to the central processing device through the
In the above embodiment, the system for analyzing the amount of exercise of the elderly provided by the invention comprises an insole, a charging interface, a reset button, a data interface, an external device, a pressure sensor, a signal processing circuit, a central processing unit, a data analysis module, a vibration unit, a step number comparison module, a step number counting unit, a standing timing unit, a standing comparison unit, a wireless transmission module, a first alarm unit and a second alarm unit, wherein the pressure sensor and the signal processing circuit can accurately acquire the pressure on the bottom of the insole, the data analysis module analyzes whether the elderly are walking or standing according to the received pressure signal, the step number counting unit and the standing timing unit calculate the walking step number and the standing time, and the vibration unit starts to vibrate according to preset data to massage the soles of the elderly when the elderly stand.
Furthermore, the external device transmits the age of the old, the weight G, the step number X is preset every day, the standing time T is preset every day, the vibration frequency f of the vibration unit and the vibration amplitude A of the vibration unit to the mobile phone of the old, meanwhile, the external device can also transmit the age of the old, the weight G, the step number X is preset every day, the standing time T is preset every day, the vibration frequency f of the vibration unit and the vibration amplitude A of the vibration unit are transmitted to the medical service terminal, medical care personnel know the age of the old through the medical service terminal, the weight G, the step number X is preset every day, the standing time T is preset every day, the vibration frequency f of the vibration unit and the vibration amplitude A of the vibration unit so as to judge whether the setting of the old.
Further, the external device is a computer or a mobile phone.
Furthermore, the data analysis module analyzes the received pressure signal to judge whether the old people are walking or standing at the moment, and the judging method is as follows:
if the pressure signal received by the data analysis module is a continuously fluctuating signal near a preset pressure threshold value within a preset time, the data analysis module judges that the old man stands at the moment;
if the pressure signal received by the data analysis module is a peak signal, the data analysis module judges that the old man is walking at the moment.
Further, the preset time is 10s, and the preset pressure threshold is a pressure threshold corresponding to the body weight G of the elderly person.
Further, there are two data resetting methods of the elderly exercise amount analysis system, the first is to manually reset data inputted from an external device through the
As shown in fig. 3, the pressure sensor is used for collecting a pressure signal applied to the insole 1, converting the collected pressure signal into a voltage signal V0, and transmitting the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit comprises a signal amplifying unit and a signal filtering unit, an output end of the pressure sensor is connected with an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected with an input end of the signal filtering unit, and an output end of the signal filtering unit is connected with an input end of the central processing unit.
Further, the signal amplifying unit includes an operational amplifier A1 and resistors R1-R9.
Wherein, the output end of the pressure sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R9, one end of a resistor R8 is grounded, the other end of a resistor R8 is connected with one end of a resistor R6, the other end of a resistor R8 is further connected with one end of a resistor R7, the other end of a resistor R6 is connected with a direct current power supply Vref, the other end of a resistor R6 is connected with one end of a resistor R4, the other end of a resistor R6 is connected with one end of a resistor R2, the other end of a resistor R2 is connected with the other end of a resistor R1, the other end of a resistor R9 is connected with one end of a resistor R7, the other end of a resistor R9 is further connected with the other end of a resistor R8, the other end of a resistor R8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the other end of the resistor R8, the other, one end of the resistor R3 is grounded, the other end of the resistor R1 is connected with the other end of the resistor R3, the other end of the resistor R1 is also connected with the non-inverting input end of the operational amplifier A1, and the output end of the operational amplifier A1 is connected with the input end of the signal filtering unit.
Furthermore, the signal filtering unit comprises resistors R10-R13, capacitors C1-C5 and operational amplifiers A2-A3.
Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, the other end of a capacitor C1 is connected with one end of a resistor R10, the other end of a capacitor C1 is further connected with one end of a capacitor C2, one end of a resistor R11 is connected with a direct current power supply Vref, the other end of a capacitor C2 is connected with the other end of a resistor R11, the other end of a capacitor C2 is further connected with the non-inverting input end of an operational amplifier A2, the other end of a resistor R10 is connected with the inverting input end of an operational amplifier, the other end of a resistor R10 is connected with the output end of an operational amplifier A2, the output end of an operational amplifier A2 is connected with one end of a resistor R12, the other end of a resistor R12 is connected with one end of a resistor R13, the other end of a resistor R12 is connected with one end of a capacitor C3, one end of a capacitor C4 is grounded, the other end of a capacitor C695, the other end of the capacitor C3 is connected with the inverting input end of the operational amplifier A3, the other end of the capacitor C3 is connected with the output end of the operational amplifier A3, the output end of the operational amplifier A3 is connected with one end of the capacitor C5, the other end of the capacitor C5 is connected with the input end of the central processing unit, and the signal filtering unit transmits the voltage signal V1 to the central processing unit.
In the above embodiment, the noise of the signal processing circuit is within 5.25nV, the drift is 1.25 μ V/DEG C, the model of the operational amplifier A1 is LT1012, and the model of the operational amplifiers A2-A3 is LT 1192.
In the signal amplifying unit, the resistance of the resistor R1 is 1k Ω, the resistance of the resistor R2 is 99k Ω, the resistance of the resistor R3 is 14.7k Ω, the resistance of the resistor R4 is 10k Ω, the resistance of the resistor R5 is 10k Ω, the resistance of the resistor R6 is 100 k Ω, the resistance of the resistor R7 is 0.1 k Ω, the resistance of the resistor R8 is 1k Ω, and the resistance of the resistor R9 is 1k Ω.
The output signal of the signal amplification unit is V01, then,
wherein the content of the first and second substances,
in the signal filtering unit, the resistance of the resistor R10 is 1k Ω, the resistance of the resistor R11 is 0.47k Ω, the resistance of the resistor R12 is 0.47k Ω, the resistance of the resistor R13 is 1k Ω, the capacitance of the capacitor C1 is 0.01 μ F, the capacitance of the capacitor C2 is 0.01 μ F, the capacitance of the capacitor C3 is 1 μ F, the capacitance of the capacitor C4 is 0.01 μ F, and the capacitance of the capacitor C5 is 1 μ F.
Because the signal collected by the pressure sensor is a weak voltage signal, the signal amplification unit amplifies the voltage V0 output by the pressure sensor through an operational amplifier A1 and resistors R1-R9, and the signal amplification unit consisting of the operational amplifier A1 and the resistors R1-R9 only has drift of 1.25 muV/DEG C, offset within 2 muV, 100pA bias current and noise of 5.25nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R10-R13, capacitors C1-C5 and an operational amplifier A2-A3 to filter the amplified electric signals, so that the pressure detection precision is improved.
This written description uses examples to disclose the disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
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