Microwave concentration measurement and control instrument and measurement system thereof

Abstract

The invention discloses a microwave concentration measurement and control instrument, which comprises a display unit, a microwave sensor, a temperature sensor, at least two coaxial microwave cables and a Pt100 lead, the temperature sensor is integrated on the microwave sensor, the display unit is provided with a mounting bottom plate, the mounting bottom plate is provided with a plurality of mounting holes, and the Pt100 lead is arranged in the mounting holes. The display unit and the microwave sensor are detachably connected with corresponding mounting holes through a coaxial microwave cable, the temperature sensor and the display unit are detachably connected with corresponding mounting holes through a Pt100 wire, the mounting bottom plate is further provided with a detachable USB data line, and one end of the USB data line is provided with a USB-B plug; the invention also discloses a microwave concentration measurement system. According to the technical scheme, through compact design, components are simple, operation is simple and easy to operate, the storage performance is optimized, and the measurement effect and the measurement efficiency of the microwave concentration are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of microwave concentration measurement and control, and in particular to a microwave concentration measurement and control instrument and a measurement system thereof. Background Art

[0002] Microwave concentration measurement and control instrument and its measurement system is a device that uses microwave technology to measure concentration. It can monitor the concentration changes of materials in real time and accurately in industrial processes. Microwave is an electromagnetic wave, and its frequency range is usually between 300MHz and 300GHz. Within this range, 2.45GHz is a specific frequency point, which is widely used in many fields.

[0003] However, traditional microwave concentration measurement and control instruments and their measurement systems are generally cumbersome to operate and have poor storage performance, which affects the measurement effect and efficiency of microwave concentration. Summary of the invention

[0004] The main purpose of the present invention is to provide a microwave concentration measuring and controlling instrument and its measuring system, aiming to solve the technical problems of the existing microwave concentration measuring and controlling instrument and its measuring system, such as cumbersome operation and poor storage performance affecting the measuring effect and efficiency.

[0005] To achieve the above-mentioned purpose, the microwave concentration measuring and controlling instrument proposed in the present invention includes a display unit, a microwave sensor, a temperature sensor, at least two coaxial microwave cables and a Pt100 wire. The display unit is provided with a microwave generator, the microwave sensor is provided with a probe, the temperature sensor is integrated in the microwave sensor, the display unit is provided with a mounting base plate, the mounting base plate is provided with a plurality of mounting holes, the display unit and the microwave sensor are detachably connected to the corresponding mounting holes through the coaxial microwave cable, the microwave generator can generate 2.45GHz microwaves, the microwaves are transmitted to the probe through the coaxial microwave cable, the temperature sensor and the display unit are detachably connected to the corresponding mounting holes through the Pt100 wire, the mounting base plate is also provided with a detachable USB data cable, one end of the USB data cable is provided with a USB-B plug, and the display unit is connected to a PC through the USB-B plug.

[0006] Optionally, the mounting base plate is further provided with a USB cap, and the USB cap is detachably covered on the interface of the USB data cable.

[0007] Optionally, the length of the coaxial microwave cable ranges from 1 to 3 meters.

[0008] Optionally, the probe of the microwave sensor is an insertion probe or a flat-plate probe.

[0009] Optionally, the display unit is provided with a CPU module, an LCD screen and a plurality of function buttons, the function buttons are arranged in sequence and at intervals on one side of the LCD screen, a data processing program is preset in the CPU module, the function buttons control the data processing program through the CPU module respectively, and the data processing program is electrically connected to the LCD screen.

[0010] Optionally, the function button is a membrane button.

[0011] Optionally, the display unit is provided with a lock button and a brightness adjustment button, and the lock button and the brightness adjustment button are arranged below the LCD screen.

[0012] Optionally, the display unit comprises a shell and an internal component, wherein the shell detachably embeds the internal component, and the internal component is provided with an SD card slot, in which an SD card is pluggably installed.

[0013] Optionally, the memory capacity of the SD card is not less than 1 GB.

[0014] A microwave concentration measurement system comprises a microwave concentration measuring and controlling instrument, remote control software and a sampling button, wherein the sampling button is connected to a display unit via a cable, the display unit generates a 2.45 GHz microwave signal, measures and transmits back the signal via a probe, and a CPU module processes the signal, including microwave phase shift, temperature compensation or microwave signal attenuation. The microwave concentration measuring and controlling instrument can realize measurement by itself through function keys, or can be connected to a PC via a USB-B plug, and the PC is installed with remote control software to realize remote control of the microwave concentration measuring and controlling instrument for measurement.

[0015] The technical solution of the present invention has the following beneficial effects: the technical solution of the present invention has a compact design, simple components, simple and easy operation, and optimized storage performance, and the measurement effect and efficiency of microwave concentration are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of a microwave concentration measurement and control instrument according to an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of a display unit in a microwave concentration measurement and control instrument according to an embodiment of the present invention; Figure 3 A schematic diagram of a built-in interface of a microwave concentration measurement and control instrument according to an embodiment of the present invention; Figure 4 A schematic diagram of the phase shift principle of microwaves in a microwave concentration measurement system according to an embodiment of the present invention; Figure 5 A schematic diagram of a measurement value formula of a microwave concentration measurement system according to an embodiment of the present invention.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] The invention provides a microwave concentration measuring and controlling instrument and a measuring system thereof.

[0023] like Figures 1 to 3As shown, in one embodiment of the present invention, the microwave concentration measuring and controlling instrument includes a display unit 100, a microwave sensor 200, a temperature sensor 300, at least two coaxial microwave cables 400 and a Pt100 wire 500. A microwave generator (not shown) is provided in the display unit 100, the microwave sensor 200 is provided with a probe 210, the temperature sensor 300 is integrated in the microwave sensor 200, and the display unit 100 is provided with a mounting base plate 110. The mounting base plate 110 is provided with a plurality of mounting holes 111, including at least four holes with a diameter of H*B=200*160mm. The display unit and the microwave sensor are detachably connected to the corresponding male interface 112 through a coaxial microwave cable 400. The coaxial microwave cable 400 cannot be bent during the process, and the power supply needs to be cut off before opening the display unit 100 or when connecting the cable. The interface of the coaxial microwave cable 400 does not need to be twisted too tightly. Under the condition of ensuring that the connection does not fall off, it can be tightly combined to facilitate manual disassembly and improve work efficiency. The coaxial microwave cable 400 must be used in pairs. To avoid signal loss, the length of the coaxial microwave cable 400 ranges from 1 to 3 meters, and the length available in special cases is 4 meters. The coaxial microwave cable 400 is produced by adopting the latest technology, has high flexibility, and has strong shielding and sealing performance. It is not easily interfered by external signals, ensuring the lowest signal loss during the transmission process. The coaxial microwave cable 400 is used to connect the transmitting end, that is, the T end, and the coaxial microwave cable 400 is used to connect the receiving end, that is, the R end. The coaxial microwave cable 400 has a female connector, which is connected to the male connector interface 112 provided on the mounting base plate 110 of the display unit 100. The microwave generator can generate 2.45GHz microwaves, and the microwaves are transmitted to the probe 210 through the T end of the coaxial microwave cable. After the microwaves penetrate the material, they are transmitted back from the other probe through the R end of the coaxial microwave cable.

[0024] Specifically, in this embodiment, various styles of probes can be provided, and appropriate probes can be provided according to the needs at different installation positions. The probe of the microwave sensor is an insertion probe or a flat-plate probe. The probe is completely wrapped during the measurement process and installed in the vertical direction to ensure the accuracy of the measurement results. The temperature sensor is integrated in the pipeline or insertion probe. Since the microwave signal will be affected by the temperature, the temperature sensor can perform effective temperature measurement, thereby performing temperature compensation.

[0025] Specifically, in this embodiment, a power supply device (not shown) is also integrated. The power supply device must be equipped with an overload protection device, such as a 1A fuse. The switch should be installed as close to the power supply device as possible in advance to cut off the current at any time. The switch and the overload protection device are easily accessible, which can effectively ensure safety. The temperature sensor 300 and the display unit 100 are detachably connected to the corresponding mounting holes through the Pt100 wire 500. The Pt100 wire 500 here adopts a four-wire connection, i.e., M12. In other embodiments, a two-wire connection can also be adopted with the help of a cable introduction device.

[0026] Specifically, the mounting base 110 is also provided with a pluggable USB data cable (not shown), one end of the USB data cable is provided with a USB-B plug (not shown), and the display unit 100 can be connected to a PC via the USB-B plug. The mounting base 110 is also provided with a USB cap (not shown), which is detachably covered on the interface of the USB data cable to effectively prevent water and dust. In other embodiments, other versions of the display unit 100 can be selected for use, such as a version without a display.

[0027] Specifically, the display unit 100 is provided with a CPU module (not shown), an LCD screen 120 and a plurality of function keys 130. The function keys 130 are membrane keys. Compared with traditional keys, membrane keys have a better feel and can withstand more pressing times without being easily damaged. The manufacturing process is relatively simple, the production cost is relatively low, and the functions of waterproof and dustproof can be effectively realized. The noise generated when the keys are pressed is relatively small, which greatly optimizes the user experience. The function buttons 130 are arranged in sequence at intervals on one side of the LCD screen 120. A data processing program is preset in the CPU module. The function keys control the data processing program through the CPU module respectively, and the data processing program is electrically connected to the LCD screen.

[0028] Specifically, the display unit 100 is provided with a lock button 140 and a brightness adjustment button 150, and the lock button 140 and the brightness adjustment button 150 are arranged below the LCD screen 120. The lock button 140 can be used to lock the set parameters to avoid accidental modification, which may cause incorrect microwave measurement or large errors. The brightness adjustment button 150 can be effectively adjusted according to the on-site environmental conditions to adjust the screen brightness to meet on-site use needs.

[0029] Specifically, the display unit 100 includes a shell 101 and internal components (not shown in the figure). The shell 101 can detachably embed the internal components and can be effectively fixed by bolts or other forms. The internal components are provided with an SD card slot (not shown in the figure). An SD card is pluggably installed in the SD card slot. The memory capacity of the SD card is not less than 1GB. While increasing the storage capacity, the measurement and test data can also be effectively saved for subsequent use. The shell 101 adopts IP65 protection certification, which fully meets the requirements for outdoor use and further expands the usage scenarios.

[0030] In addition, this embodiment also provides a microwave concentration measurement system, such as Figure 4 As shown, it includes a microwave concentration measuring and controlling instrument, remote control software and a sampling button. The sampling button is connected to the display unit through a cable of at least 10 meters long. The sampling button is provided with a sampling valve. The sampling valve is placed as close to the measuring point as possible to ensure reliable sampling. The display unit generates a 2.45GHz microwave signal. The microwave signal is measured and the signal is transmitted back through a probe. The probe includes a transmitting end (T end) and a receiving end (R end). The CPU module processes the signal, including microwave phase shift, temperature compensation or microwave signal attenuation. The microwave concentration measuring and controlling instrument can realize measurement by itself through function buttons, and can also be connected to a PC through a USB-B plug. The PC is installed with remote control software to realize remote control of the microwave concentration measuring and controlling instrument for measurement.

[0031] Specifically, when the system is run for the first time, configuration settings are required, such as language settings. The system has multiple optional language versions built in, including German, English, French, Italian, Spanish or Portuguese. In particular, there is also a system reset for resetting the system in the event of configuration changes. Specifically, the microwave concentration measurement and control instrument is equipped with an initial setting function for the sensor, and has three built-in measurement methods, including microwave phase shift measurement method (default setting), microwave intensity or voltage difference measurement method, and microwave attenuation measurement method. The selection can be achieved through function buttons or remote control software according to application needs. At the same time, in order to meet the measurement needs, it is necessary to confirm whether the strength of the microwave signal is sufficient to be transmitted from the transmitting end to the receiving end of the microwave sensor probe. The normal measurement signal strength should be between 25 and 55dB, and the corresponding voltage strength is 3~8V. If the signal is too weak, a signal amplifier TX-Booste can be used according to the measurement situation. r is used to strengthen the original microwave signal at the transmitting end, and / or RX-Transponder is used to remove the interference signal at the receiving end. In this embodiment, microwave phase shift measurement is used for measurement. When calibrating, a starting reference point needs to be set at the workplace. During each initial calibration, a measurement reference value should be set with reference to the actual concentration of the material (obtained through measurement and analysis). The sampling, sample analysis, and the process of entering the analysis results into the calculation unit should be performed with the shortest possible interval time. After the starting reference point is set, the system calibration process must be completed through several samplings. The samples should be representative and cover the entire measurement range as much as possible.

[0032] Specifically, when measuring, the microwave signal will be affected by temperature, so the phase shift of the microwave needs to be compensated by calculating the temperature difference through a mathematical model. The specific implementation method can be selected and input through the function button or remote control software. A reference temperature T must be defined first when measuring. ref and temperature coefficient T k1 , the average temperature of the entire process can be regarded as the reference temperature T ref , the initial temperature coefficient can be set to T k1 =-1.5 (-1.5000e+00), if necessary, it can be adjusted according to the actual situation.

[0033] Specifically, in the initial calibration process of the measurement, the determination of the function parameters needs to be obtained through laboratory sampling and analysis data. Before obtaining the final function parameters, an initial parameter needs to be set, the coefficient a 0 Indicates the Y coordinate pitch, i.e. the maximum measurement value reserved, a 1 represents the function slope, x represents the microwave phase shift value after temperature compensation, and y represents the concentration measurement result, such as Figure 5 As shown, we get formula 1: y=a 1*x+a 0 Where a0 and a1 define the measurement range, and MW is the measurement value, i.e. y, calculated as shown in Formula 2: MW 最大 =a 1 *0+a 0 MW 最小 =a 1 *360+a 0 Usually, the maximum measured value is selected as a 0 , a1 is the absorption coefficient of microwaves and is related to the geometric distance between the probes in the measured material. The measurement range of the microwave phase shift can only be between 0° and 360°, so the maximum measurement range of the measurement system can be obtained. However, the measurement results of the display unit may have a constant error, which indicates that there is a constant phase offset. In order to correct the phase offset, the offset constant is changed from the coefficient a 0 Just add or subtract.

[0034] Specifically, the system can directly store data in the SD card or memory of the internal components, or it can be directly connected to the PC through the USB interface. In order to insert or replace the SD card, the shell must be opened with the power cut off. The manufacturer's standard for the SD card is an SD card with a memory of 1GB. Data storage can be carried out uninterruptedly. If the memory is full, the front-end stored data will be automatically overwritten. It is also possible to transfer the recorded data from the SD card to the PC.

[0035] Specifically, in order to successfully complete the measurement, the measured product must have dielectric properties. Due to the absorption of microwaves by free water molecules, the measurement of water-containing liquids can achieve the highest accuracy. In addition, the measurement system is based on microwave transmission technology and uses low-energy microwaves that penetrate the material to calibrate and measure the characteristics of the material. Only a few microwatts of microwave energy will not cause any harm to the human body and the environment, and will not have any effect on the properties of the product during the measurement process.

[0036] The principle of the present invention is as follows: a microwave generator emits a 2.45 GHz microwave signal, which is transmitted and penetrates a material with dielectric properties through a probe transmitting end of a coaxial microwave cable, and then the signal is received by a probe at a microwave receiving end of the coaxial microwave cable; the received signal is continuously changed due to changes in the moisture content in the material; a reference signal is an ideal standard wave that is not affected by the medium, and is compared in real time with an attenuation signal that penetrates the material to calculate the phase shift and attenuation of the attenuation signal after passing through the material, which is specifically manifested as a decrease in the phase shift in the propagation speed; after the phase shift and attenuation are calculated, they are converted through a mathematical model and displayed in the form of a numerical value as concentration or density.

[0037] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A microwave concentration measuring and controlling instrument, characterized in that: The invention comprises a display unit, a microwave sensor, a temperature sensor, at least two coaxial microwave cables and a Pt100 wire. A microwave generator is arranged in the display unit, a probe is arranged in the microwave sensor, and the temperature sensor is integrated in the microwave sensor. The display unit is provided with a mounting base plate, and a plurality of mounting holes are arranged on the mounting base plate. The display unit and the microwave sensor are detachably connected to the corresponding mounting holes through the coaxial microwave cable. The microwave generator can generate 2.45 GHz microwaves, and the microwaves are transmitted to the probe through the coaxial microwave cable. The temperature sensor and the display unit are detachably connected to the corresponding mounting holes through the Pt100 wire. The mounting base plate is also provided with a detachable USB data cable, and a USB-B plug is arranged at one end of the USB data cable. The display unit is connected to a PC through the USB-B plug.

2. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The mounting base plate is also provided with a USB cap, and the USB cap is detachably covered on the interface of the USB data cable.

3. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The length of the coaxial microwave cable ranges from 1 to 3 meters.

4. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The probe of the microwave sensor is an insertion probe or a flat-plate probe.

5. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The display unit is provided with a CPU module, an LCD screen and a plurality of function buttons, wherein the function buttons are arranged in sequence and at intervals on one side of the LCD screen, a data processing program is preset in the CPU module, and the function buttons control the data processing program through the CPU module respectively, and the data processing program is electrically connected to the LCD screen.

6. The microwave concentration measuring and controlling instrument according to claim 5, characterized in that: The function keys are membrane keys.

7. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The display unit is provided with a lock button and a brightness adjustment button, and the lock button and the brightness adjustment button are arranged below the LCD screen.

8. The microwave concentration measuring and controlling instrument according to claim 1, characterized in that: The display unit comprises a shell and an internal component. The shell detachably embeds the internal component. The internal component is provided with an SD card slot, and an SD card is pluggably installed in the SD card slot.

9. The microwave concentration measuring and controlling instrument according to claim 8, characterized in that: The memory capacity of the SD card is not less than 1GB.

10. A microwave concentration measurement system, characterized in that: It includes a microwave concentration measuring and controlling instrument as described in any one of claims 1 to 9, remote control software and a sampling button, the sampling button is connected to a display unit through a cable, the display unit generates a 2.45 GHz microwave signal, measures and transmits back the signal through a probe, and a CPU module processes the signal, including microwave phase shift, temperature compensation or microwave signal attenuation. The microwave concentration measuring and controlling instrument can realize measurement by itself through function buttons, and can also be connected to a PC through a USB-B plug. The PC installs remote control software to realize remote control of the microwave concentration measuring and controlling instrument for measurement.

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