A method and system for improving temperature compensation measurement accuracy of microwave power meter

Abstract

The present invention discloses a method and system for improving the temperature compensation measurement accuracy of a microwave power meter, comprising: obtaining the standard power of a pre-selected temperature compensation power point under each path of a multi-way switch, and constructing a calibration rule according to the corresponding relationship between the standard power and the output power of a signal source; adjusting the output power of the signal source according to the path where the probe of the microwave power meter to be compensated is located by using the calibration rule of the corresponding path, and obtaining the compensation calibration value of the probe of the microwave power meter to be compensated at the current temperature according to the adjusted output power of the signal source. Each path is calibrated, and by adjusting the output power of the signal source, the power value entering the microwave power meter is ensured to be accurate, and the error introduced by the difference of each switch path is eliminated, thereby improving the temperature compensation measurement accuracy of the microwave power meter and improving the compensation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature compensation, and in particular to a method and a system for improving the temperature compensation measurement accuracy of a microwave power meter. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Since the detection circuit of the peak probe and the logarithmic amplifier after detection are both temperature sensitive devices, the ADC (Analog to Digital Converter) values ​​measured at different temperatures for the same input power will have large deviations. In order to solve this deviation, the microwave power probe must be temperature compensated.

[0004] The existing microwave power sensor temperature compensation system adopts the power division method. For example, in Chinese patent CN107561355A, it is disclosed that a temperature compensation system is established by means of a computer, a signal source, a power divider, a standard power meter and a programmable multi-way switch, and the power value output to the multi-way switch is ensured to remain unchanged by the standard power meter.

[0005] However, due to the differences in the various paths of the multi-way switch, the power values ​​entering the microwave power probe through the various paths of the multi-way switch will be inconsistent, that is, the power value entering the microwave power probe will be affected by the differences in the various paths of the multi-way switch. The power division method does not compensate for this difference, resulting in a maximum difference of nearly 1.5dB, which leads to a certain error in the temperature compensation data, thereby affecting the measurement accuracy of the temperature response of the microwave power meter. The accuracy is poor, and the power measurement accuracy in the full temperature range is ±0.2dB.

[0006] Furthermore, when collecting data at each standard power point at the temperature point, a standard power meter is required for real-time approximation, which takes a long time to compensate and has low efficiency. When compensating 10 probes at a time, the data collection time is about 4 hours. Summary of the invention

[0007] In order to solve the above problems, the present invention proposes a method and system for improving the temperature compensation measurement accuracy of a microwave power meter, calibrates each path, and adjusts the output power of the signal source to ensure that the power value entering the microwave power meter is accurate, and eliminates the errors introduced by the differences in each switch path, thereby improving the temperature compensation measurement accuracy of the microwave power meter and improving the compensation efficiency.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a method for improving the temperature compensation measurement accuracy of a microwave power meter, characterized in that the microwave power meter is connected to a multi-way switch, and the output power of a signal source is transmitted to the microwave power meter via the multi-way switch to obtain a temperature compensation calibration value; the obtaining of the temperature compensation calibration value comprises:

[0010] Under each path of the multi-way switch, the standard power of the pre-selected temperature compensation power point is obtained, and a calibration rule is constructed according to the corresponding relationship between the standard power and the output power of the signal source;

[0011] According to the path where the probe of the microwave power meter to be compensated is located, the signal source output power is adjusted using the calibration rule of the corresponding path, and the compensation calibration value of the microwave power meter to be compensated at the current temperature is obtained according to the adjusted signal source output power.

[0012] As an optional implementation, according to the one-to-one correspondence between the standard power of the pre-selected temperature compensation power point and the signal source output power of the corresponding path, the magnitude of the signal source output power value under the standard power is determined to construct a calibration rule.

[0013] As an optional implementation, the process of compensating the output power of the signal source using the calibration rules of the corresponding path includes connecting a standard power meter to the output end of the multi-way switch based on the calibration rules, adjusting the output of the signal source according to the size of the temperature compensation power point under the standard power meter, and ensuring that the output power of the multi-way switch is consistent with the standard power value to ensure the accuracy of the power value at the temperature compensation power point.

[0014] As an optional implementation, the process of obtaining the standard power of a pre-selected temperature compensated power point includes connecting each path of the multi-way switch to a standard power meter, and obtaining the standard power value of the pre-selected temperature compensated power point through the standard power meter under each path of the multi-way switch.

[0015] As an optional implementation, after the compensation calibration values ​​of the current temperature of the probe of the microwave power meter to be compensated are sampled, a temperature compensation calibration table of the microwave power meter to be compensated corresponding to each path is constructed, and the temperature compensation calibration table is downloaded to the corresponding microwave power meter to be compensated.

[0016] In a second aspect, the present invention provides a system for improving the temperature compensation measurement accuracy of a microwave power meter, comprising: a microwave power meter to be compensated, a standard power meter, a multi-way switch and a signal source;

[0017] The standard power meter is connected to the multi-way switch, and the standard power meter obtains the standard power of the temperature compensation power point under each path of the multi-way switch to construct a calibration rule according to the standard power and the output power of the signal source;

[0018] The output end of the signal source is connected to the probe of the microwave power meter to be compensated through a multi-way switch, and the output power of the signal source is adjusted according to the calibration rule and transmitted to the microwave power meter.

[0019] As an optional embodiment, the system also includes a high and low temperature test chamber, in which the probe of the microwave power meter to be compensated is placed, and the high and low temperature test chamber is used to ensure that the probe of the microwave power meter obtains the temperature environment of the required compensation temperature point.

[0020] As an optional implementation, the system further comprises a compensation power meter, and the compensation power meter is respectively connected to the probe of the microwave power meter to be compensated through a multi-core cable.

[0021] As an optional embodiment, the system further comprises a computer and a compensation power meter, and the computer communicates with the compensation power meter via GPIB.

[0022] As an optional implementation, the system further includes a computer and a high and low temperature test chamber, wherein the computer is connected to the high and low temperature test chamber via an RS232 serial port to automatically control the high and low temperature test chamber to change temperature.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a method and system for improving the temperature compensation measurement accuracy of a microwave power meter, which improves the temperature compensation measurement accuracy of the microwave power meter, eliminates the measurement accuracy affected by temperature compensation data errors, and improves compensation efficiency.

[0025] In a method and system for improving the temperature compensation measurement accuracy of a microwave power meter of the present invention, a calibration method is used to calibrate each path to ensure that the power value entering the microwave power meter is accurate and eliminate the error introduced by the differences in each switch path. The measurement accuracy in the full temperature range is higher, approximately ±0.1dB.

[0026] In a method and system for improving the temperature compensation measurement accuracy of a microwave power meter of the present invention, a calibration method is adopted, and calibration only needs to be performed once before temperature compensation and stored in a table. Data collection at each subsequent temperature point only needs to call the table, and there is no need to use a standard power meter every time. This shortens the time wasted due to the need for real-time approximation at each temperature point in a power division method. When 10 probes are compensated at one time, the data collection time is about 2 hours. Compared with the power division method, the temperature compensation process is more efficient.

[0027] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 It is a schematic diagram of an existing temperature compensation system based on the power division method;

[0030] Figure 2 A schematic diagram of a system for improving the temperature compensation measurement accuracy of a microwave power meter provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0035] Example 1

[0036] According to the background technology, the existing microwave power sensor temperature compensation system adopts the power division method, such as Figure 1 As shown, the temperature compensation system includes: a number of peak power probes that need to be compensated, a high and low temperature test chamber, a programmable multi-way switch, a power divider, a compensation power meter, a standard power meter, a signal source and a computer; the number of compensation probes are placed in the high and low temperature test chamber, the input end of the power divider is connected to the signal source, one output end of the power divider is respectively connected to the number of peak power probes that need to be compensated in the high and low temperature test chamber through the programmable multi-way switch, and the other output end of the power divider is connected to the standard power meter; the compensation power meter is respectively connected to the number of compensation probes through a multi-core cable; the computer communicates with the compensation power meter through GPIB.

[0037] The temperature compensation method is as follows: after the output power of the signal source passes through the power divider, the input power of the standard power meter and the compensation power meter are equal, the output of the signal source is adjusted, and the compensation power point is approached by reading the value of the standard power meter, and the output value of the signal source is finally determined. At this time, the input value of the compensation power meter is the compensation power point; when the output of the signal source and the measurement of the compensation power meter are stable, the computer communicates with the compensation power meter using GPIB to read the current temperature ADC value and the sampling ADC value of the current power point. That is, the power value output by the signal source to the multi-way switch is guaranteed to remain unchanged through the standard power meter.

[0038] However, due to the differences in the paths of the multi-way switch, the power values ​​entering the microwave power sensor through the paths of the multi-way switch will be inconsistent, that is, the power value entering the microwave power sensor will be affected by the differences in the paths of the multi-way switch, and the above power division method does not compensate for the difference. Moreover, for each temperature point, each data collection requires real-time approximation by a standard power meter, and the compensation time is long.

[0039] In view of the above technical problems, this embodiment provides a method for improving the temperature compensation measurement accuracy of a microwave power meter, wherein the microwave power meter is connected to a multi-way switch, and the output power of a signal source is transmitted to the microwave power meter via the multi-way switch to obtain a temperature compensation calibration value; the method of obtaining the temperature compensation calibration value includes:

[0040] Under each path of the multi-way switch, the standard power of the pre-selected temperature compensation power point is obtained, and a calibration rule is constructed according to the corresponding relationship between the standard power and the output power of the signal source;

[0041] According to the path where the probe of the microwave power meter to be compensated is located, the signal source output power is adjusted using the calibration rule of the corresponding path, and the compensation calibration value of the microwave power meter to be compensated at the current temperature is obtained according to the adjusted signal source output power.

[0042] In this embodiment, the probes of several microwave power meters are connected to a programmable multi-way switch, each path of the programmable multi-way switch is connected to a standard power meter, and under each path, a preset temperature compensation power point is selected, and the standard power value of the temperature compensation power point is obtained through the standard power meter;

[0043] At the same time, the power value of each path input of the programmable multi-way switch, that is, the output power value of the signal source, is obtained, and a one-to-one correspondence between the standard power value of the temperature compensation power point and the output power value of the signal source is established to obtain the calibration rule.

[0044] In this embodiment, the temperature point to be compensated is determined according to the probe of the microwave power meter to be compensated. After the equilibrium time is reached, the calibration rule of the corresponding path is used to adjust the output power of the signal source, so that under the adjusted output power of the signal source, the standard sampling values ​​collected by the probe of the microwave power meter to be compensated under each path are obtained in turn.

[0045] Preferably, the use of the calibration rule of the corresponding path to adjust the output power of the signal source specifically includes: since each path of the multi-way switch has different differences, if the input power value of the multi-way switch is 0dBm, then after passing through the first path, the second path, etc. in sequence, the power value will be attenuated, and due to the differences between the paths, the attenuation rate will be different, which will also cause the power value of the temperature compensation power point to be inaccurate;

[0046] Then, this embodiment first obtains the standard power value of the pre-selected temperature compensation power point and the signal source output power value of the corresponding path, and determines the magnitude of the signal source output power value under the standard power value according to the one-to-one correspondence; for example, if the temperature compensation point is to output a power value of 2dBm, then this power value is accurate, and the magnitude of the corresponding signal source output power value can be deduced from this, so that the power value of the temperature compensation power point can be guaranteed to be accurate;

[0047] If the attenuation rate of the first path is 2dB and the attenuation rate of the second path is 3dB, then the signal source output power value corresponding to the first path should be 0dBm, and the signal source output power value corresponding to the second path should be -1dBm; in subsequent measurements, the input power of the multi-way switch is adjusted directly according to the size of the signal source output power value corresponding to the standard power value, so as to obtain the accurate power value of the temperature compensation point, thus solving the problem of differences between the paths.

[0048] Preferably, by adopting the above-mentioned method, after establishing a corresponding relationship between the standard power value and the corresponding signal source output power value, only an initial calibration is required, and the rule can be called for subsequent adjustments.

[0049] Preferably, if the temperature compensation power point is to be changed, or if the standard power value of the temperature compensation power point is to be changed, recalibration is required.

[0050] Preferably, the corresponding accurate signal source output power value can be deduced based on the difference between the standard power value at the temperature compensation power point and the initial signal source output power value.

[0051] Preferably, the balancing time is set to 30 minutes in this embodiment, because the microwave power meter needs to collect data from multiple (such as 7) different temperature points when performing temperature compensation, and needs to balance for 30 minutes after setting each temperature point.

[0052] Preferably, in order to improve efficiency and shorten the temperature compensation time of all microwave power meters, the present embodiment can compensate the probes of multiple microwave power meters at one time, and select which access signal source to collect data in a time-sharing manner through a programmable multi-way switch.

[0053] In this embodiment, after sampling of the probes of all microwave power meters to be compensated is completed, a temperature compensation calibration table corresponding to the microwave power meter under each path is generated, and the table is downloaded to the EEPROM of the corresponding microwave power meter.

[0054] This embodiment adopts a calibration method to calibrate each path to ensure that the power value entering the microwave power meter is accurate and eliminate the error introduced by the differences in each switch path. The method of this embodiment has a higher measurement accuracy in the full temperature range, approximately ±0.1dB.

[0055] At the same time, the present embodiment adopts a calibration method, which only needs to be calibrated once before temperature compensation and stored in a table. The subsequent data collection at each temperature point only needs to call the table, and there is no need to use a standard power meter every time. This shortens the time wasted due to the need for real-time approximation at each temperature point by the power division method. When the method of the present embodiment compensates 10 probes at a time, the data collection time is about 2 hours. Compared with the power division method, the temperature compensation process is more efficient.

[0056] Example 2

[0057] like Figure 2 As shown, this embodiment provides a system for improving the temperature compensation measurement accuracy of a microwave power meter, comprising: a plurality of probes of microwave power meters to be compensated, a high and low temperature test chamber, a programmable multi-way switch, a compensation power meter, a standard power meter, a signal source and a computer;

[0058] The probes of the microwave power meters to be compensated are placed in a high and low temperature test box, the output end of the signal source is respectively connected to the probes of the microwave power meters to be compensated in the high and low temperature test box through a programmable multi-way switch, the standard power meter is connected to the programmable multi-way switch, and the standard power value of the temperature compensation power point under each path of the programmable multi-way switch is obtained; the compensation power meter is respectively connected to the probes of the microwave power meters to be compensated through a multi-core cable; the computer communicates with the compensation power meter through GPIB.

[0059] In this embodiment, the computer is connected to the high and low temperature test box via an RS232 serial port, and automatically controls the high and low temperature test box to change temperature without manual intervention.

[0060] Among them, the computer is used to program the signal source, standard power meter, compensation power meter, multi-way switch, high and low temperature test chamber to automatically complete the temperature compensation process of the microwave power meter;

[0061] The output of the signal source is a continuous wave power value, and its output size is determined by a standard power meter;

[0062] The standard power meter is used to ensure that the signal source outputs the power value of the required compensation power point;

[0063] The compensation power meter is used to read the temperature ADC value and the voltage ADC value of each compensation power point of the probe of the microwave power meter at different temperatures;

[0064] The program-controlled multi-way switch is used to select which microwave power meter probe is connected to the output of the signal source in a time-sharing manner;

[0065] The high and low temperature test chamber is used to ensure that the probe of the microwave power meter obtains the temperature environment of the required compensation temperature point.

[0066] In this embodiment, the signal source is directly connected to the programmable multi-way switch, and the output power of the signal source is adjusted to compensate for the difference between different paths of the programmable multi-way switch.

[0067] In this embodiment, the compensation method for improving the temperature compensation measurement accuracy of the microwave power meter system adopts the method described in Embodiment 1, which will not be described in detail here.

[0068] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for improving the temperature compensation measurement accuracy of a microwave power meter, characterized in that: The microwave power meter is connected to a multi-way switch, and the output power of the signal source is transmitted to the microwave power meter via the multi-way switch to obtain a temperature compensation calibration value; The obtaining of the temperature compensation calibration value comprises: Under each path of the multi-way switch, the standard power of the pre-selected temperature compensation power point is obtained, and a calibration rule is constructed according to the corresponding relationship between the standard power and the output power of the signal source; According to the path where the probe of the microwave power meter to be compensated is located, the output power of the signal source is adjusted using the calibration rule of the corresponding path, and the compensation calibration value of the microwave power meter to be compensated at the current temperature is obtained according to the adjusted output power of the signal source; According to the one-to-one correspondence between the standard power of the pre-selected temperature compensation power point and the signal source output power of the corresponding path, the magnitude of the signal source output power value under the standard power is determined, thereby constructing a calibration rule; By adjusting the input power of the multi-way switch according to the size of the signal source output power value corresponding to the standard power value, the power value of the accurate temperature compensation point can be obtained; after establishing a corresponding relationship between the standard power value and the corresponding signal source output power value, only the initial calibration is required, and the rule can be called for subsequent adjustments.

2. A method for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 1, characterized in that: The process of compensating the output power of the signal source using the calibration rule of the corresponding path includes connecting the standard power meter to the output end of the multi-way switch based on the calibration rule, adjusting the output of the signal source according to the size of the temperature compensation power point under the standard power meter, and ensuring that the output power of the multi-way switch is consistent with the standard power value.

3. A method for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 1, characterized in that: The process of obtaining the standard power of the pre-selected temperature compensation power point includes connecting each path of the multi-way switch to a standard power meter, and obtaining the standard power value of the pre-selected temperature compensation power point through the standard power meter under each path of the multi-way switch.

4. A method for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 1, characterized in that: After the compensation calibration values ​​of the probe of the microwave power meter to be compensated are sampled at the current temperature, a temperature compensation calibration table of the microwave power meter to be compensated corresponding to each path is constructed, and the temperature compensation calibration table is downloaded to the corresponding microwave power meter to be compensated.

5. A system for improving the temperature compensation measurement accuracy of a microwave power meter, characterized in that: include: Microwave power meter to be compensated, standard power meter, multi-way switch and signal source; The standard power meter is connected to the multi-way switch, and the standard power meter obtains the standard power of the temperature compensation power point under each path of the multi-way switch to construct a calibration rule according to the standard power and the output power of the signal source; The output end of the signal source is connected to the probe of the microwave power meter to be compensated through a multi-way switch, and the output power of the signal source is adjusted according to the calibration rule and transmitted to the microwave power meter; According to the one-to-one correspondence between the standard power of the pre-selected temperature compensation power point and the signal source output power of the corresponding path, the magnitude of the signal source output power value under the standard power is determined, thereby constructing a calibration rule; By adjusting the input power of the multi-way switch according to the output power value of the signal source corresponding to the standard power value, the power value of the temperature compensation point can be accurately obtained; After establishing a correspondence between the standard power value and the corresponding signal source output power value, only the initial calibration is required, and the rule can be called for subsequent adjustments.

6. A system for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 5, characterized in that: The system also includes a high and low temperature test box, in which the probe of the microwave power meter to be compensated is placed, and the high and low temperature test box is used to ensure that the probe of the microwave power meter obtains the temperature environment of the required compensation temperature point.

7. A system for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 5, characterized in that: The system also includes a compensation power meter, which is respectively connected to the probe of the microwave power meter to be compensated through a multi-core cable.

8. A system for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 5, characterized in that: The system further comprises a computer and a compensation power meter, wherein the computer communicates with the compensation power meter via GPIB.

9. A system for improving the temperature compensation measurement accuracy of a microwave power meter as claimed in claim 5, characterized in that: The system also includes a computer and a high and low temperature test box. The computer is connected to the high and low temperature test box via an RS232 serial port to automatically control the high and low temperature test box to change temperature.

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