Multi-frequency microwave moisture content detection device

Abstract

The utility model discloses a multi-frequency microwave moisture content detection device, which belongs to the technical field of detection and comprises a base, a measuring probe is mounted on the outer side of the base, a microwave detection plate is mounted on one side of the base, a protective cover is attached to the outer side of the microwave detection plate, a connecting pipe is mounted at the top of the base, and a fixing flange is mounted at the top of the connecting pipe. The top of the fixing flange is connected with a shell, a fixing plate is installed in the shell, a signal processing plate is installed on one side of the fixing plate, and a meter head is installed on the top of the shell. According to the utility model, the meter head, the first signal transmission line, the signal processing board, the second signal transmission line, the microwave detection board and the measuring probe are arranged in a matching manner, the signal processing board generates a 300-2.4 GHz microwave signal, sends the signal to the microwave detection board, and processes the signal returned to the signal processing board by the microwave detection board; and signals processed by the signal processing board are sent into the gauge outfit, so that the measurement range of the device is wide, effective measurement can be realized within the range of 0-100%, and the same precision is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a multi-frequency microwave water content detection device. Background Art

[0002] In the process of oilfield production, the measurement of water content is crucial for statistics of oilfield production and understanding of geological changes. In the traditional production process, samples are taken manually from oil wells and taken back to the laboratory for testing to determine the water content of the oil products. This method is time-consuming, complex in operation, and working in the laboratory for a long time is harmful to the human body.

[0003] At present, the main real-time on-line measurement methods for the water content of crude oil on the market are radio frequency method, capacitance method, ray method, etc. Among them, the radio frequency method has a large discrimination degree and small error in the low water content range, but is affected by the oil-water phase transition characteristics in the high water content range, with low discrimination degree; the capacitance method has mature technology, but the change of capacitance value is very small in the high water content section, and the measurement error is very large; the ray method has high measurement accuracy and the widest measurement range, but has low safety and serious ray pollution.

[0004] The utility model provides a multi-frequency microwave water content detection device, which has a simple structure, reasonable design, and can accurately detect the whole range of 0% - 100% of the water content of crude oil based on the microwave method. Summary of the Utility Model

[0005] In order to improve the problems mentioned above, such as the main real-time on-line measurement methods for the water content of crude oil on the market are radio frequency method, capacitance method, ray method, etc., the radio frequency method has low discrimination degree, the capacitance method has a large measurement error, and the ray method has low safety and serious ray pollution, the utility model provides a multi-frequency microwave water content detection device.

[0006] The utility model provides a multi-frequency microwave water content detection device, adopting the following technical scheme:

[0007] A multi-frequency microwave water content detection device includes a base. A measurement probe is installed on the outer side of the base. A microwave detection board is installed on one side of the base. A protective cover is attached to the outer side of the microwave detection board. A connecting pipe is installed on the top of the base. A fixed flange is installed on the top of the connecting pipe. The top of the fixed flange is connected to a housing. A fixing plate is installed inside the housing. A signal processing board is installed on one side of the fixing plate. A meter head is installed on the top of the housing. A first signal transmission line is connected between the meter head and the signal processing board. A second signal transmission line is connected between the signal processing board and the microwave detection board.

[0008] By adopting the above technical solution, the device is installed as a whole in a suitable position through a fixed flange, and the base is immersed in the medium to be measured. The signal processing board generates a 300MHz-2.4GHz microwave signal and sends it to the microwave detection board, and processes the signal returned by the microwave detection board to the signal processing board, and sends the signal processed by the signal processing board to the meter header, so that the measured moisture content can be displayed on the meter header on the spot, so that the device has a wide measurement range, and can effectively measure from 0% to 100% with the same accuracy.

[0009] Optionally, a microstrip antenna and a temperature sensor are provided inside the microwave detection board.

[0010] By adopting the above technical solution, the microstrip antenna produces different phase shifts for the high-frequency signal according to the different media, and the temperature sensor signal is transmitted to the CPU for temperature compensation calculation to correct the measurement error caused by the change of dielectric constant due to temperature change of the medium.

[0011] Optionally, a fixing frame is connected between the top and bottom of the protective cover and the base.

[0012] By adopting the above technical solution, the microwave detection plate and the protective cover are tightly fitted to prevent the microwave detection plate from being damaged by the measured substance.

[0013] Optionally, a sealing ring is provided at the connection between the connecting pipe and the base.

[0014] By adopting the above technical solution, the measured medium can be prevented from entering the interior of the base as much as possible.

[0015] Optionally, one end of the signal processing board facing away from the fixing plate is fitted with a metal isolation cover.

[0016] By adopting the above technical solution, the signal processing board is prevented from being interfered by external signals, and the generated signals are prevented from interfering with the first signal transmission line.

[0017] Optionally, a signal generator, a power divider and a demodulator are sequentially arranged inside the signal processing board.

[0018] By adopting the above technical solution, the radio frequency detection function is realized.

[0019] Optionally, the protective cover is a polytetrafluoroethylene protective cover.

[0020] By adopting the above technical solution, the protective cover has the characteristics of corrosion resistance, high temperature resistance, and non-stickiness.

[0021] Optionally, a microprocessor control board and a display module are installed inside the meter head.

[0022] By adopting the above technical solution, it is convenient to locally display the measured moisture content on the meter head.

[0023] In summary, the present utility model includes at least one of the following beneficial effects:

[0024] Through the cooperative setting of the meter head, the first signal transmission line, the signal processing board, the second signal transmission line, the microwave detection board and the measurement probe, the signal processing board generates a microwave signal of 300 MHz - 2.4 GHz and sends it to the microwave detection board, processes the signal returned from the microwave detection board to the signal processing board, and sends the signal processed by the signal processing board into the meter head, so that the measurement range of the device is wide, and it can be effectively measured within the range of 0% - 100%, and has the same precision.

[0025] By arranging a microstrip antenna and a temperature sensor inside the microwave detection board, the microstrip antenna generates different phase displacements for high-frequency signals according to different media, and the signal of the temperature sensor is transmitted to the CPU for temperature compensation operation to correct the measurement error caused by the change of the dielectric constant of the medium due to the change of temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0028] Figure 2 is a schematic three-dimensional structure diagram of the present utility model;

[0029] Figure 3 is a system block diagram of the present utility model.

[0030] In the figure: 1, meter head; 2, first signal transmission line; 3, outer shell; 4, signal processing board; 5, metal isolation cover; 6, fixing plate; 7, fixing flange; 8, second signal transmission line; 9, connecting pipe; 10, sealing ring; 11, fixing frame; 12, base; 13, microwave detection board; 14, protective cover; 15, measurement probe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will further elaborate on the present utility model in conjunction with the attached Figures 1-3 for a more detailed description.

[0032] Please refer to the drawings in the specification Figure 1The utility model provides an embodiment: a multi-frequency microwave moisture content detection device, comprising a base 12, a measuring probe 15 is installed on the outside of the base 12, a microwave detection board 13 is installed on one side of the base 12, and a microstrip antenna and a temperature sensor are arranged inside the microwave detection board 13. The microstrip antenna generates different phase shifts for the high-frequency signal according to the different media, and the temperature sensor signal is transmitted to the CPU for temperature compensation calculation to correct the measurement error caused by the change of the dielectric constant of the medium due to the temperature change.

[0033] Please refer to the attached figure in the instruction manual Figure 1 The outer side of the microwave detection plate 13 is attached with a protective cover 14, and the top and bottom of the protective cover 14 are connected with a fixing frame 11 to the base 12. The microwave detection plate 13 and the protective cover 14 are tightly attached to prevent the microwave detection plate 13 from being damaged by the measured substance. The protective cover 14 is a polytetrafluoroethylene protective cover. The protective cover 14 has the characteristics of corrosion resistance, high temperature resistance, and non-stick properties.

[0034] Please refer to the attached figure in the instruction manual Figure 1 A connecting pipe 9 is installed on the top of the base 12, and a sealing ring 10 is provided at the connection between the connecting pipe 9 and the base 12. Try to avoid the measured medium from entering the interior of the base 12.

[0035] Please refer to the attached figure in the instruction manual Figure 1 , Figure 2 and Figure 3 A fixing flange 7 is installed on the top of the connecting pipe 9, and a housing 3 is connected to the top of the fixing flange 7. A fixing plate 6 is installed inside the housing 3. A signal processing board 4 is installed on one side of the fixing plate 6. A metal isolation cover 5 is attached to the end of the signal processing board 4 away from the fixing plate 6. The signal processing board 4 is prevented from being interfered by external signals, and the generated signals are prevented from interfering with the first signal transmission line 2. A signal generator, a power divider and a demodulator are arranged in sequence inside the signal processing board 4. The radio frequency detection function is realized.

[0036] Please refer to the attached figure in the instruction manual Figure 1 and Figure 2 A meter head 1 is installed on the top of the housing 3, a first signal transmission line 2 is connected between the meter head 1 and the signal processing board 4, a second signal transmission line 8 is connected between the signal processing board 4 and the microwave detection board 13, and a microprocessor control board and a display module are installed inside the meter head 1. It is convenient to display the measured moisture content on the meter head 1 on the spot.

[0037] Working principle: When using the device, the whole device is installed in a suitable position through the fixed flange 7, and the base 12 is immersed in the medium to be measured. The signal generator inside the MCU control signal processing board 4 generates high-frequency signals. The high-frequency signals are divided into two identical signals by the power divider inside the signal processing board 4 and output. One of them is directly input to the local oscillator signal input terminal of the demodulator inside the signal processing board 4 with phase discrimination function as the reference signal, and the other is connected to the microwave detection board 13 as the measurement signal. After the measurement signal is transmitted in the medium to be measured, a certain amplitude and phase difference are generated relative to the reference signal, which is received by the receiving part. The received signal is input to the demodulator again. The demodulator will output two signals, one is the voltage value of the phase difference and the other is the voltage value of the amplitude difference. The two signals are input to the input terminal of the ADC unit for A / D conversion. The MCU reads the A / D conversion values of the two signals. The moisture content of the medium to be measured is obtained through the corresponding algorithm from the phase difference value, and the signal is transmitted to the microprocessing control board inside the meter head 1, which is convenient to display the measured moisture content locally on the meter head 1, so that the measurement range of the device is wide, and it can be effectively measured within the range of 0% - 100%, and has the same accuracy.

[0038] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A multi-frequency microwave moisture content detection device, comprising a base (12), characterized in that: A measuring probe (15) is mounted on the outer side of the base (12); a microwave detection board (13) is mounted on one side of the base (12); a protective cover (14) is attached to the outer side of the microwave detection board (13); a connecting pipe (9) is mounted on the top of the base (12); a fixing flange (7) is mounted on the top of the connecting pipe (9); the top of the fixing flange (7) is connected to the outer shell (3); a fixing plate (6) is mounted inside the outer shell (3); a signal processing board (4) is mounted on one side of the fixing plate (6); a meter head (1) is mounted on the top of the outer shell (3); a first signal transmission line (2) is connected between the meter head (1) and the signal processing board (4); and a second signal transmission line (8) is connected between the signal processing board (4) and the microwave detection board (13).

2. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: A microstrip antenna and a temperature sensor are arranged inside the microwave detection board (13).

3. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: A fixing frame (11) is connected between the top and bottom of the protective cover (14) and the base (12).

4. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: A sealing ring (10) is provided at the connection between the connecting pipe (9) and the base (12).

5. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: One end of the signal processing board (4) facing away from the fixing board (6) is fittedly connected to a metal isolation cover (5).

6. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: The signal processing board (4) is provided with a signal generator, a power divider and a demodulator in sequence.

7. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: The protective cover (14) is a polytetrafluoroethylene protective cover.

8. A multi-frequency microwave moisture content detection device according to claim 1, characterized in that: A microprocessor control board and a display module are installed inside the meter head (1).

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