A multifunctional real-time wireless monitoring and demodulation system

Abstract

The present invention discloses a multifunctional real-time wireless monitoring and demodulation system, in which a multi-parameter coplanar integrated resonant sensor is connected to a radio frequency signal acquisition / demodulation circuit; the radio frequency signal acquisition / demodulation circuit is connected to the host computer; the multi-parameter coplanar integrated resonant sensor comprises: a first substrate, a second substrate, a temperature sensitive unit and a pressure sensitive unit; a groove is provided on the lower surface of the first substrate; the upper surface of the second substrate is bonded to the lower surface of the first substrate to form a closed cavity at the groove; the pressure sensitive unit is provided on the upper surface of the first substrate corresponding to the center position of the cavity; the temperature sensitive unit is provided on the upper surface of the first substrate and is at a set distance from the pressure sensitive unit; the temperature sensitive unit is connected to the pressure sensitive unit; the present invention can perform real-time monitoring under harsh conditions such as high temperature, high pressure, high rotation, and narrow space.

Description

Technical Field

[0001] The present invention relates to the technical field of special environment wireless measurement, in particular to a multifunctional real-time wireless monitoring and demodulation system. Background Art

[0002] In industrial fields such as aerospace, petrochemicals, and weaponry, aircraft engine combustion chambers, flight control for long-range, ultra-high-speed missiles, and downhole oil extraction all operate in different environments, but are subject to the combined influence of temperature, pressure, vibration, and other complex environments. During on-site testing, traditional test system data acquisition relies on cable connections. This not only presents complex wiring and the risk of cable aging and short circuits, but also presents significant cable losses due to excessive length, especially when testing in harsh environments. Furthermore, the data collected by existing measurement systems cannot be processed and analyzed in real time; the collected data must be recovered and manually processed and analyzed, which introduces significant inconvenience to testing. These systems are unable to meet measurement requirements in harsh and complex environments, such as high temperature, high pressure, high rotation, and confined spaces.

[0003] Therefore, a wireless measurement system is needed. However, the existing wireless measurement systems still have the following problems:

[0004] 1. It is large and heavy and not easy to carry;

[0005] 2. Single signal acquisition;

[0006] 3. The function is single, only realizing real-time data acquisition function, and failing to perform real-time decoupling and calibration of multi-parameter signals.

[0007] Therefore, based on the above problems, there is an urgent need to provide a new monitoring and mediation system. Summary of the Invention

[0008] The purpose of the present invention is to provide a multifunctional real-time wireless monitoring and demodulation system that can perform real-time monitoring under harsh conditions such as high temperature, high pressure, high rotation, and narrow space.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] A multifunctional real-time wireless monitoring and demodulation system, comprising: a multi-parameter coplanar integrated resonant sensor, a radio frequency signal acquisition / demodulation circuit, and a host computer;

[0011] The multi-parameter coplanar integrated resonant sensor is connected to the radio frequency signal acquisition / demodulation circuit; the radio frequency signal acquisition / demodulation circuit is connected to the host computer;

[0012] The multi-parameter coplanar integrated resonant sensor includes: a first substrate, a second substrate, a temperature sensitive unit, and a pressure sensitive unit; a groove is provided on the lower surface of the first substrate; the upper surface of the second substrate is bonded to the lower surface of the first substrate, so that a sealed cavity is formed at the groove; the pressure sensitive unit is provided on the upper surface of the first substrate corresponding to the center position of the cavity; the temperature sensitive unit is provided on the upper surface of the first substrate and is at a set distance from the pressure sensitive unit; the temperature sensitive unit is connected to the pressure sensitive unit;

[0013] The radio frequency signal acquisition / demodulation circuit is used to acquire / demodulate the echo signal of the multi-parameter coplanar integrated resonant sensor;

[0014] The host computer is used to perform decoupling analysis and processing based on the information demodulated by the acquisition / demodulation circuit to obtain the detection result.

[0015] Optionally, the radio frequency signal acquisition / demodulation circuit includes: a phase-locked loop (PLL), a low-pass filter, a power amplifier, a signal separator, and a radio frequency gain phase detection circuit;

[0016] The phase-locked loop (PLL) is used to generate a radio frequency excitation signal; the excitation signal is filtered by the low-pass filter group and then amplified by a power amplifier; the signal separation device is used to excite the multi-parameter coplanar integrated resonant sensor with a part of the excitation signal, and transmit the other part together with the echo signal of the multi-parameter coplanar integrated resonant sensor to the radio frequency gain phase detection circuit, thereby obtaining gain information.

[0017] Optionally, the host computer includes: a parameter setting module, a real-time data acquisition and processing module, a data analysis module and a database interaction module;

[0018] The parameter setting module is used for serial port setting, database path setting and calibration library entry;

[0019] The real-time data acquisition and processing module is used for real-time data display, automatic resonance point capture and data system error calibration;

[0020] The data analysis module is used to perform multi-parameter decoupling and data fitting;

[0021] The database interaction module is used to save and read data.

[0022] Optionally, both the first substrate and the second substrate are high-temperature resistant ceramic substrates or high-temperature resistant piezoelectric substrates.

[0023] Optionally, the first substrate and the second substrate are made of LTCC, HTCC, LGS or lithium niobate.

[0024] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0025] The present invention provides a multifunctional real-time wireless monitoring and demodulation system. When a multi-parameter, high-temperature-resistant, coplanar integrated resonant sensor device is operating, external pressure can cause the cavity to deform, thereby changing the propagation velocity of surface acoustic waves on a first substrate and, in turn, the operating frequency of the pressure-sensitive unit. Simultaneously, changes in ambient temperature can also cause the first substrate to deform, thereby changing the operating frequency of the temperature-sensitive unit. A temperature-sensitive unit is positioned outside the cavity, relative to the upper surface of the first substrate, so that it has the same ambient temperature as the pressure-sensitive unit in the cavity. The temperature detected by the temperature-sensitive unit is used to compensate for the pressure detected by the pressure-sensitive unit, thereby eliminating any interference or influence of temperature on the pressure detection results. Multiple parameters are then decoupled to obtain the detection results. This invention not only simplifies the system and improves its adaptability and convenience, but also enables real-time monitoring, acquisition, decoupling, and calibration of multiple parameters in harsh environments, making the system more practical and versatile. Furthermore, the invention offers advantages such as small size, portability, multi-signal acquisition, and multi-functional processing, enabling real-time acquisition, decoupling, and calibration of multi-parameter signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a structural diagram of a multifunctional real-time wireless monitoring and demodulation system provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the RF signal acquisition / demodulation circuit principle;

[0029] Figure 3 Schematic cross-sectional view of a multi-parameter coplanar integrated resonant sensor;

[0030] Figure 4 is a schematic plan view of the upper surface of the first substrate;

[0031] Figure 5 This is a schematic diagram of the host computer processing flow;

[0032] Figure 6 Schematic diagram of the single-port error model. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a multifunctional real-time wireless monitoring and demodulation system that can perform real-time monitoring under harsh conditions such as high temperature, high pressure, high rotation, and narrow space.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 As shown, the present invention provides a multifunctional real-time wireless monitoring and demodulation system, comprising: a multi-parameter coplanar integrated resonant sensor, a radio frequency signal acquisition / demodulation circuit and a host computer;

[0037] The multi-parameter coplanar integrated resonant sensor is connected to the radio frequency signal acquisition / demodulation circuit; the radio frequency signal acquisition / demodulation circuit is connected to the host computer;

[0038] The multi-parameter coplanar integrated resonant sensor includes: a first substrate 1, a second substrate 2, a temperature sensitive unit 5, and a pressure sensitive unit 4; a groove 6 is provided on the lower surface 7 of the first substrate; the upper surface of the second substrate 2 is bonded to the lower surface 7 of the first substrate, so that a sealed cavity A is formed at the groove 6; the pressure sensitive unit 4 is provided on the upper surface 3 of the first substrate corresponding to the center position of the cavity A; the temperature sensitive unit 5 is provided on the upper surface 3 of the first substrate and is at a set distance from the pressure sensitive unit 4; the temperature sensitive unit 5 is connected to the pressure sensitive unit 4;

[0039] The temperature-sensitive unit 5 and pressure-sensitive unit 4 are not limited to the surface acoustic wave sensors mentioned in the present invention, but can also be included in resonant sensors, such as LC sensors. Furthermore, the integrated temperature and pressure sensor is not limited to the temperature / pressure dual-parameter integrated sensor mentioned in the present invention, but is also applicable to single-parameter, dual-parameter, and triple-parameter integrated sensors involving temperature, such as temperature strain and temperature vibration.

[0040] The radio frequency signal acquisition / demodulation circuit is used to acquire the echo signal of the multi-parameter coplanar integrated resonant sensor;

[0041] The host computer is used to perform decoupling analysis and processing based on the information demodulated by the acquisition / demodulation circuit to obtain the detection result.

[0042] Because both pressure and temperature changes can cause deformation on the surface of first substrate 1, the pressure detected by pressure-sensitive unit 4 can be affected by temperature fluctuations, leading to inaccurate detection results. Therefore, a temperature-sensitive unit 5 is positioned outside cavity A, relative to the upper surface 3 of the first substrate, so that it has the same ambient temperature as the pressure-sensitive unit 4 located within cavity A. The temperature detected by this unit can be used to compensate for the pressure detected by pressure-sensitive unit 4, thereby eliminating the adverse effects of temperature on pressure detection results. Furthermore, the temperature-sensitive unit 5 located outside cavity A is used to detect ambient temperature.

[0043] The multi-parameter high-temperature resistant coplanar integrated resonant sensing device is affected by the superposition of temperature and pressure. The resonant frequency of the pressure sensitive unit 4 can be expressed as the following formula.

[0044] f p =F1(T,P) (1)

[0045] Here, F1(T, P) refers to the functional relationship between the influence of temperature T and pressure P on the pressure sensitive unit; T represents a certain temperature; and P represents a certain pressure.

[0046] At the same temperature, f p It is linearly related to pressure and can be expressed by the following formula.

[0047] f P =F2(T)*P+F3(T) (2)

[0048] In this formula, F2(T) is the slope of the pressure-frequency relationship at different temperatures, and F3(T) is the intercept of the pressure-frequency relationship at different temperatures. Extract the relationship between temperature and slope.

[0049] The resonant frequency of the temperature sensitive unit 5 can be expressed as the following formula.

[0050] f T =F4(T,P) (3)

[0051] Among them, F4 (T, P) refers to the functional relationship of the temperature sensitive unit, which is affected by temperature T and pressure P. The interference of pressure on temperature is approximately 0, so the resonant frequency of the temperature sensitive unit 5 is shown in the following formula.

[0052] f T =F5(T) (4)

[0053] Here, F5(T) refers to the functional relationship in which the temperature sensitive unit is only affected by temperature T.

[0054] According to formulas (1)(2)(4), the actual pressure can be expressed as follows.

[0055]

[0056] The decoupled pressure value is obtained, thereby achieving decoupling of the mutual interference of multiple parameters.

[0057] like Figure 3 As shown, the pressure-sensitive unit 4 is located on the upper surface 3 of the first substrate, in the center of cavity A, and the temperature-sensitive unit 5 is located on the upper surface 3 of the first substrate, away from cavity A. As can be seen from the above embodiment, changes in pressure and temperature will cause the surface of the first substrate 1 to deform. Due to the presence of the sealed cavity A, the pressure causes the deformation of the first substrate 1 near the center of cavity A to be relatively greater, while the deformation of the first substrate 11 away from the center of cavity A to be relatively smaller. Therefore, the temperature-sensitive unit 5 is located away from the center of cavity A, minimizing the impact of pressure on the accuracy of temperature detection results.

[0058] In order to clearly show the location of each sensor, Figure 4 The outline of the groove 6 on the first substrate 1 bonded thereto is indicated by a dotted line on the upper surface of the first substrate 1 in FIG.

[0059] The RF signal acquisition / demodulation circuit includes: a phase-locked loop PLL (sweep frequency source), a low-pass filter, a power amplifier, a signal separator and a RF gain phase detection circuit; the RF signal acquisition / demodulation circuit of the present invention is designed based on the network analyzer architecture and FSCW radar principle, such as Figure 2 shown.

[0060] The phase-locked loop PLL is used for the radio frequency excitation signal; the excitation signal is filtered by the low-pass filter group and then amplified by the power amplifier; the signal separation device is used to excite the multi-parameter coplanar integrated resonant sensor with a part of the excitation signal, and transmit the other part together with the echo signal of the multi-parameter coplanar integrated resonant sensor to the radio frequency gain phase detection circuit, thereby obtaining gain information.

[0061] The HMC832 chip is a high-performance frequency synthesizer with an integrated voltage-controlled oscillator (VCO) covering 1500MHz to 3000MHz. It can operate in fractional mode and, through a frequency divider, can output frequencies over an ultra-wide frequency range of 25MHz to 3.0GHz. Combined with an external reference oscillator and loop filter, it maintains excellent phase noise and spurious performance. Values are written to registers via the field-programmable gate array (FPGA) to control the HMC832 to generate the desired RF signal within this range.

[0062] By programming the phase-locked loop registers, the output power can range from -10 to -3dBm. To increase the transmission distance between the transmitting and receiving antennas, an Analog Devices AD8353RF single-ended power amplifier is used, providing up to 9dBm of linear output power and 20dB of gain. To separate the input and reflected signals, the system employs a microstrip two-way power splitter (MPD-DC / 3-2S) and an Agilent directional coupler (86205A). The power splitter evenly divides the RF signal power output from the phase-locked loop into two channels. One channel enters the directional coupler input port and outputs a sinusoidal signal through the through-port output port to excite the sensor. The sensor's echo signal, coupled to the directional coupler output port and the power splitter, enters the two channels of the signal receiving module.

[0063] Analog Devices has introduced the AD8302, the first monolithic integrated circuit for RF / IF amplitude and phase measurement. It can simultaneously measure the amplitude ratio and phase difference between two input signals over a frequency range from low frequencies to 2.7 GHz. The AD8302 consists of two precision broadband logarithmic amplifiers, a phase detector, an output amplifier group, a bias unit, and an output reference voltage buffer. The AD8302 uses two precisely matched broadband logarithmic amplifiers to achieve amplitude and phase measurements on two input channel signals. The amplitude and phase measurement equations are shown below.

[0064]

[0065] V phs =V Φ [|Φ(V inA )-Φ(V inB )|] (7)

[0066] Where: V inA is the input signal amplitude of channel A, V inB is the input signal amplitude of channel B, V slp is the slope, V mag is the amplitude comparison output, Φ(v inA ) is the input signal phase of channel A, Φ(v inB ) is the input signal phase of channel B, V Φ is the slope, V phs is the phase comparison output.

[0067] Taking into account factors such as sampling accuracy, sampling frequency, number of channels, power supply, and price, the system uses ADI's 12-bit 40MSPS dual-channel AD9231 analog-to-digital converter. The chip has two ADCs inside, which can convert two differential analog signals into two digital signals. It can also convert the two-channel analog voltage signals output by the amplitude and phase detection module into digital signals and send them to the host computer through the serial port for data processing.

[0068] The multifunctional host computer software provided in this example includes parameter setting module, real-time data acquisition and processing module, data analysis module, and database interaction module. The multifunctional host computer software is based on the Labview program development environment. The host computer software function flow chart is as follows: Figure 5 shown.

[0069] The parameter setting module is used to configure the serial port, database path, and calibration library. The circuit and the host computer require serial communication. The circuit sends data to the host computer via the serial port, and the host computer processes the collected raw data. The correct serial port must be selected for data transmission. Before testing, standard data must be entered to calibrate the software. Furthermore, the data storage path must be set.

[0070] The real-time data acquisition and processing module is used to display data in real time, automatically capture the resonance point, and calibrate the data system error. The host computer displays the sine wave curve on the interface in real time through the data transmitted by the serial port. Real-time capture of the resonance point. Among them, the data system error calibration is divided into directivity error - D, source matching error - Ms, and frequency response reflection tracking error - TR. The single-port error model is as follows Figure 6 As shown. M is the reflection coefficient before calibration. Γ A is the reflection coefficient after calibration. The calibration formula is shown below.

[0071] Circuit breaker:

[0072] Circuit breaker:

[0073] Matched load: Γ L =D (10)

[0074] The data analysis module includes multi-parameter decoupling and data fitting. The multi-parameter decoupling algorithm described in claim 2 is written into multi-functional host computer software, enabling real-time decoupling and analysis of data from the real-time data acquisition and processing module. The multi-parameter decoupling algorithm requires data fitting processing and analysis, and data fitting information can be displayed online in real time.

[0075] The database interaction module includes data storage and reading.

[0076] The data analysis module is used to perform multi-parameter decoupling and data fitting;

[0077] The database interaction module is used to save and read data.

[0078] The first substrate 1 and the second substrate 2 are both high-temperature resistant ceramic substrates or high-temperature resistant piezoelectric substrates. The use of high-temperature resistant substrates and resonant devices not only significantly increases the operating temperature of the temperature-sensitive unit 5 and the pressure-sensitive unit 4, enabling real-time health monitoring of components in high-temperature environments, but also prevents high temperatures from affecting the accuracy of the pressure-sensitive unit 4's detection results through temperature compensation. Furthermore, the device has the advantages of simple structure, compact size, and low manufacturing cost.

[0079] The materials of the first substrate 1 and the second substrate 2 can be selected from high-temperature piezoelectric substrates such as lanthanum gallium silicate, lithium niobate, etc., and high-temperature resistant ceramic substrates such as LTCC, HTCC, etc.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0081] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A multifunctional real-time wireless monitoring and demodulation system, characterized in that: include: Multi-parameter coplanar integrated resonant sensor, RF signal acquisition / demodulation circuit and host computer; The multi-parameter coplanar integrated resonant sensor is connected to the radio frequency signal acquisition / demodulation circuit; The radio frequency signal acquisition / demodulation circuit is connected to the host computer; The multi-parameter coplanar integrated resonant sensor includes: a first substrate, a second substrate, a temperature sensitive unit, and a pressure sensitive unit; a groove is provided on the lower surface of the first substrate; the upper surface of the second substrate is bonded to the lower surface of the first substrate, so that a sealed cavity is formed at the groove; the pressure sensitive unit is provided on the upper surface of the first substrate corresponding to the center position of the cavity; the temperature sensitive unit is provided on the upper surface of the first substrate and is at a set distance from the pressure sensitive unit; the temperature sensitive unit is connected to the pressure sensitive unit; The radio frequency signal acquisition / demodulation circuit is used to acquire / demodulate the echo signal of the multi-parameter coplanar integrated resonant sensor; The host computer is used to perform decoupling analysis and processing based on the information demodulated by the acquisition / demodulation circuit to obtain the detection result.

2. A multifunctional real-time wireless monitoring and demodulation system according to claim 1, characterized in that: The radio frequency signal acquisition / demodulation circuit includes: a phase-locked loop (PLL), a low-pass filter, a power amplifier, a signal separator, and a radio frequency gain phase detection circuit; The phase-locked loop (PLL) is used to generate a radio frequency excitation signal; the excitation signal is filtered by the low-pass filter group and then amplified by a power amplifier; the signal separation device is used to excite the multi-parameter coplanar integrated resonant sensor with a part of the excitation signal, and transmit the other part together with the echo signal of the multi-parameter coplanar integrated resonant sensor to the radio frequency gain phase detection circuit, thereby obtaining gain information.

3. A multifunctional real-time wireless monitoring and demodulation system according to claim 1, characterized in that: The host computer includes: a parameter setting module, a real-time data acquisition and processing module, a data analysis module and a database interaction module; The parameter setting module is used for serial port setting, database path setting and calibration library entry; The real-time data acquisition and processing module is used for real-time data display, automatic resonance point capture and data system error calibration; The data analysis module is used to perform multi-parameter decoupling and data fitting; The database interaction module is used to save and read data.

4. A multifunctional real-time wireless monitoring and demodulation system according to claim 1, characterized in that: The first substrate and the second substrate are both high-temperature resistant ceramic substrates or high-temperature resistant piezoelectric substrates.

5. The multifunctional real-time wireless monitoring and demodulation system according to claim 1, characterized in that: The materials of the first substrate and the second substrate are LTCC, HTCC, LGS or lithium niobate.

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