CN107561355A - A kind of temperature compensation system and method for peak power probe - Google Patents
A kind of temperature compensation system and method for peak power probe Download PDFInfo
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- CN107561355A CN107561355A CN201710741896.2A CN201710741896A CN107561355A CN 107561355 A CN107561355 A CN 107561355A CN 201710741896 A CN201710741896 A CN 201710741896A CN 107561355 A CN107561355 A CN 107561355A
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Abstract
The invention discloses the temperature compensation system and method for a kind of peak power probe, including：Some compensation probes are placed in high-low temperature test chamber, the input connecting signal source of power splitter, one output end of power splitter is connected respectively by program control variable connector with the peak power probe that some needs in high-low temperature test chamber compensate, another output end connection reference power meter of power splitter；Compensation power meter is connected respectively by multicore cable with some compensation probes；Computer is communicated by GPIB with compensation power meter.Beneficial effect of the present invention：Measurement efficiency is high：It is automatically performed by the DSP of main frame, without manual intervention；The temperature-compensating time is short：10ms or so.
Description
Technical field
The present invention relates to peak power probe temperature compensation technique field, more particularly to a kind of temperature of peak power probe
Compensation system and method.
Background technology
Because the logafier after the detecting circuit of peak value probe and detection is all temperature sensor, so as to cause
ADC (Analog to Digital Converter) value deviation that identical input power measures at different temperatures is very big.For
Solution this deviation, must just temperature-compensating be carried out to probe.
Because the peak power probe of Most current is no temperature-compensating, their temperature characterisitic passes through external school
Quasi- source ensures, i.e., external calibration source be by temperature-compensating, as long as therefore temperature change more than 5 DEG C, main frame will prompt to use
Probe is connected on calibration source and recalibrated by family.At this time, it may be necessary to artificial popping one's head in moves on to calibration source output terminal from tested end and entered
Row calibration, then re-establishes correction card, carries out temperature-compensating, and the time needs 2 minutes or so, and whole process wastes time and energy,
Efficiency, the continuity of measurement are had a strong impact on.
It is relatively frequently and accurate to measurement in real time for temperature fluctuation so as to cause due to that can not be calibrated in real time
Degree requires higher system and equipment, and above-mentioned calibration program can not be met.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, it is proposed that a kind of temperature compensation system of peak power probe
And method, the temperature ADC value once popped one's head in is read at regular intervals, and according to current temperature ADC value, using temperature-compensating
Algorithm is modified to original calibrated form, establishes the accurate corresponding relation of ADC values and performance number under Current Temperatures；It can protect
Demonstrate,prove real-time and the degree of accuracy of the user in whole peak power measurement.
To achieve these goals, the present invention adopts the following technical scheme that：
The invention discloses a kind of temperature compensation system of peak power probe, including：Some its peak works for needing to compensate
Rate probe, high-low temperature test chamber, program control variable connector, power splitter, compensation power meter, reference power meter, signal source and computer；
Some compensation probes are placed in high-low temperature test chamber, and the input connecting signal source of the power splitter is described
The peak power that one output end of power splitter is compensated by some needs in program control variable connector and high-low temperature test chamber is visited
Head connects respectively, another output end connection reference power meter of the power splitter；The compensation power meter passes through multicore cable
It is connected respectively with some compensation probes；The computer is communicated by GPIB with compensation power meter.
Further, the computer is connected by RS232 serial ports with high-low temperature test chamber, automatically controls thermocycling
Case carries out temperature change, without manual intervention.
Further, temperature ADC value and voltage ADC value of each compensation power points under different temperature points are obtained first, so
Computer obtains the temperature multinomial coefficient of all sampled power points by curve fitting algorithm afterwards, and temperature coefficient table is made
Lattice, last computer program-control compensation power meter pop one's head in temperature coefficient form write-in peak power.
Further, the input power value of the reference power meter is equal with the input power value of compensation power meter；Pass through
Computer program-control signal source, the performance number size for setting it to export repeatedly, and the performance number of reference power meter is read, when reading
When the performance number of reference power meter is equal to power points to be compensated, the input value for now compensating power meter is also power points to be compensated.
The invention also discloses a kind of temperature compensation of peak power probe, comprise the following steps：
(1) path is measured respectively and calibrates the data acquisition that path is affected by temperature；
(2) after data acquisition terminates, the temperature multinomial coefficient of all sampled power points is obtained by curve fitting algorithm；
The multinomial coefficient of obtained sampled power point is made in the EEPROM of temperature coefficient form write-in peak power probe；
(3) temperature compensation coefficient under each power points of original calibrated form is calculated；
(4) temperature compensation coefficient in original calibrated form under each power points is multiplied by the ADC values under corresponding power point respectively,
Obtain the correction card of corresponding Current Temperatures.
Further, in the step (2), the data acquisition that the measurement path is affected by temperature is specially：
The output in Regulate signal source, compensation power points is approached by reading the size of reference power meter, it is final to determine letter
The output valve in number source, the input value for now compensating power meter are to compensate power points；Treat signal source output and compensation power measurement
Amount is stable, and computer is communicated with GPIB with compensation power meter, reads the sampling of current temperature ADC and current power point
ADC；
The data acquisition that is affected by temperature of calibration path is specially：
Computer sets probe D/A outputting standard power points by the program control compensation power meters of GPIB, and is read by GPIB
The temperature ADC of current probe and the sampling ADC of Current standards power points.
Further, in the step (2), the method for making original calibrated form is specially：
At normal temperatures, using scaled signal source as output, since maximum power point, letter is set gradually to set step-length
Number source, and untill being calibrated to lower power always according to the type of probe；
Multiple ADC samplings are carried out to each power points and are averaged；
Corresponding relation deposit form by the performance number of all calibration power points and ADC values is original calibrated form.
Further, in the step (3), the method for the temperature compensation coefficient under calculating each power points of original calibrated form
Specially：
If power P adjacent power points (P of any two in measured power pointm,Pm+1) between, and corresponding to it
Temperature coefficient is respectively (TCm,TCm+1), then：
Further, in the step (3), the method for the temperature compensation coefficient under calculating each power points of original calibrated form
Specially：
If the value of power P is on maximum measured power point, the temperature system corresponding to directly with maximum sampled power point
Number；I.e.：
TC=TCn-1。
Further, in the step (3), the method for the temperature compensation coefficient under calculating each power points of original calibrated form
Specially：
If the value of power P is under minimum measured power point, directly with two minimum sampled power point (P0,P1) carry out
Interpolation extends downwards, and corresponding temperature coefficient is respectively (TC0,TC1), then：
Beneficial effect of the present invention：
Relative to traditional temperature-compensating mode, the invention has the advantages that：
1) measurement efficiency is high：It is automatically performed by the DSP of main frame, without manual intervention；
2) the temperature-compensating time is short：10ms or so；
3) accuracy, stability are good：Temperature change is caught in real time, is carried out temperature-compensating, is compared suitable for temperature fluctuation
Frequently and to real-time measuring accuracy require higher system and equipment.
Brief description of the drawings
Fig. 1 is the temperature compensation system structural representation of peak power of the present invention probe.
Embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
The invention discloses a kind of temperature compensation system of peak power probe, as shown in figure 1, including：It is some to need to mend
Peak power probe, high-low temperature test chamber, program control variable connector, power splitter, compensation power meter, reference power meter, the signal repaid
Source and computer；
Some peak power probes for needing to compensate are placed in high-low temperature test chamber, the input connection signal of power splitter
Source, an output end of power splitter pass through the peak power that program control variable connector compensates with some needs in high-low temperature test chamber
Probe connects respectively, another output end connection reference power meter of power splitter；Compensate power meter by multicore cable with it is some
The peak power for needing to compensate is popped one's head in and connected respectively；Computer passes through GPIB (General-Purpose Interface Bus)
Communicated with compensation power meter.
Wherein,
Computer-be used for programme-controlled signal source, reference power meter, compensation power meter, variable connector, high-low temperature test chamber, from
The dynamic temperature compensation procedure for completing peak power probe；
Signal source-signal source output is continuous wave power value (output size is determined by reference power meter).
The performance number of reference power meter-compensation power points needed for the output of guarantee signal source；
Compensate each compensation power points of power meter-reading peak power probe temperature ADC value at different temperatures and electricity
Press ADC values；
Variable connector-be used for the output which peak power probe access power splitter timesharing selects；
Power splitter-performance number for signal source to be exported is divided into two-way and is respectively fed to reference power meter and compensation power
Meter；
The temperature environment of high-low temperature test chamber-compensation temperature point needed for the probe acquisition of guarantee peak power.
Because peak power probe is carrying out needing the data for gathering 7 different temperature points during temperature-compensating, and setting
Balance is required for after complete each temperature spot 30 minutes, in order to improve efficiency, when shortening the temperature-compensating of all peak power probes
Between, we can once compensate multiple peak power probes, and carrying out timesharing by variable connector selects which to access power splitter,
Carry out the collection of data.
The operation principle of whole system：
Obtain first it is each compensation power points popped one's head in by peak power after, temperature ADC value and electricity under different temperature points
ADC values are pressed, then computer obtains the temperature multinomial coefficient of all sampled power points by curve fitting algorithm, and temperature is made
Coefficient form is spent, last computer program-control compensation power meter pops one's head in temperature coefficient form write-in peak power.
The invention also discloses a kind of temperature compensation of peak power probe, including：
(1) measure path and calibrate the data acquisition that path is affected by temperature；
The output to signal source is carried out program control as shown in Figure 1, and the peak power probe for needing to compensate is placed in into temperature control box
It is interior, during temperature change, there is sufficiently long equilibration time (about 30 minutes).
1) data acquisition that measurement path is affected by temperature
Measurement path is detector diode, speed-sensitive switch, logafier, the line that input signal is popped one's head in by peak power
The path of the ingoing power meter main frame analog-digital converters such as property amplifier.
Ensure that reference power meter is equal with compensation power meter input power with power splitter, the output in Regulate signal source, pass through
The size for reading reference power meter approaches compensation power points, the final output valve for determining signal source, now compensates power meter
Input value is to compensate power points；Treat that signal source output and compensation power meter measurement are stable, computer GPIB and compensation power
Meter is communicated, and reads current temperature ADC value and the sampling ADC value of current power point.
As shown in figure 1, the input of the output connection power splitter of signal source, the two-way output of power splitter are respectively connected to compensate work(
Rate meter and reference power meter, due to being decile, the input power value of reference power meter and the input power value of compensation power meter are
Equal.Therefore, we are by computer program-control signal source, the performance number size for setting it to export repeatedly, and read standard work(
The performance number of rate meter, when the performance number of the reference power meter of reading is equal to power points to be compensated, now compensate the defeated of power meter
Enter value and power points to be compensated.
2) data acquisition that calibration path is affected by temperature
Calibration path be the probe internally provided calibration source of peak power output voltage values by speed-sensitive switch, logafier,
The path of the ingoing power meter main frame analog-digital converter such as linear amplifier.
Computer sets probe D/A outputting standard power points by the program control compensation power meters of GPIB, and is read by GPIB
The temperature ADC value of current probe and the sampling ADC value of Current standards power points.
After data acquisition terminates, the temperature that all these sampled power points are obtained with Chebyshev's curve fitting algorithm is more
Binomial coefficient.Finally the multinomial coefficient of these sampled power points is made in the EEPROM of temperature coefficient form write-in probe.
Wherein, original calibrated form：Under normal temperature (23 DEG C or so), using scaled signal source as output, from maximum work
Rate point 20dBm starts, and sets gradually signal source by stepping of 1dB, and be calibrated to lower power always according to the type of probe and be
Only, and multiple ADC samplings will be carried out to each power points and be averaged.Finally, by it is all calibration power points performance numbers and
The corresponding relation deposit form of ADC values is original calibrated form.
(2) measure path and calibrate asking for for passage temperature penalty coefficient；
It is terrible due to when temperature-compensating is carried out, the collection and processing of data have only been carried out to certain power point
The temperature coefficient of all power points into original calibrated form, we are handled using following three kinds of situations：
1st, asked between the power points being sampled using interpolation algorithm.
If power P is between the adjacent power points (P of above-mentioned measured power point any twom,Pm+1) between, and it is corresponding
Temperature coefficient be respectively (TCm,TCm+1), then：
2nd, on maximum sampled power point, the temperature coefficient corresponding to directly with maximum sampled power point.I.e.：
TC=TCn-1
3rd, under minimum sampled power point, if power P is less than minimum sampled power point, we are directly with two minimums
Sampled power point (P0,P1) enter row interpolation and extend downwards, corresponding temperature coefficient is respectively (TC0,TC1), then：
So far, we can be in the hope of the temperature coefficient corresponding to each power points in original calibrated form.Finally, successively
It is multiplied by corresponding ADC values, you can the correction card for adapting to Current Temperatures is tried to achieve, so as to ensure that power under Current Temperatures
The accuracy of measurement.
(3) based on measurement path and calibration passage temperature penalty coefficient to the amendment of original calibrated form and benefit in probe
Repay.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
- A kind of 1. temperature compensation system of peak power probe, it is characterised in that including：Some peak powers for needing to compensate are visited Head, high-low temperature test chamber, program control variable connector, power splitter, compensation power meter, reference power meter, signal source and computer；Some compensation probes are placed in high-low temperature test chamber, the input connecting signal source of the power splitter, the work(point The peak power probe point that one output end of device is compensated by some needs in program control variable connector and high-low temperature test chamber Do not connect, another output end connection reference power meter of the power splitter；If it is described compensation power meter by multicore cable with Dry compensation probe connects respectively；The computer is communicated by GPIB with compensation power meter.
- 2. the temperature compensation system of a kind of peak power probe as claimed in claim 1, it is characterised in that the computer leads to Cross RS232 serial ports to be connected with high-low temperature test chamber, automatically control high-low temperature test chamber and carry out temperature change, without manual intervention.
- 3. the temperature compensation system of a kind of peak power probe as claimed in claim 1, it is characterised in that obtain each benefit first Temperature ADC value and voltage ADC value of the power points under different temperature points are repaid, then computer obtains institute by curve fitting algorithm There is the temperature multinomial coefficient of sampled power point, and temperature coefficient form is made, last computer program-control compensates power meter by temperature Spend coefficient form write-in peak power probe.
- A kind of 4. temperature compensation system of peak power probe as claimed in claim 1, it is characterised in that the calibration power The input power value of meter is equal with the input power value of compensation power meter；By computer program-control signal source, set its defeated repeatedly The performance number size gone out, and read the performance number of reference power meter, when the performance number of the reference power meter of reading be equal to it is to be compensated During power points, the input value for now compensating power meter is also power points to be compensated.
- 5. a kind of temperature compensation of peak power probe, it is characterised in that comprise the following steps：(1) path is measured respectively and calibrates the data acquisition that path is affected by temperature；(2) after data acquisition terminates, the temperature multinomial coefficient of all sampled power points is obtained by curve fitting algorithm；Will To sampled power point multinomial coefficient be made temperature coefficient form write-in peak power probe EEPROM in；(3) temperature compensation coefficient under each power points of original calibrated form is calculated；(4) temperature compensation coefficient in original calibrated form under each power points is multiplied by the ADC values under corresponding power point respectively, obtains The correction card of corresponding Current Temperatures.
- A kind of 6. temperature compensation of peak power probe as claimed in claim 5, it is characterised in that the step (2) In, the data acquisition that the measurement path is affected by temperature is specially：The output in Regulate signal source, compensation power points is approached by reading the size of reference power meter, finally determines signal source Output valve, now compensate power meter input value be compensate power points；Treat that signal source output and compensation power meter measurement are steady Fixed, computer is communicated with GPIB with compensation power meter, reads the sampling ADC of current temperature ADC and current power point；The data acquisition that is affected by temperature of calibration path is specially：Computer sets probe D/A outputting standard power points by the program control compensation power meters of GPIB, and is read currently by GPIB The temperature ADC of probe and the sampling ADC of Current standards power points.
- A kind of 7. temperature compensation of peak power probe as claimed in claim 5, it is characterised in that the step (2) In, the method for making original calibrated form is specially：At normal temperatures, using scaled signal source as output, since maximum power point, signal is set gradually to set step-length Source, and untill being calibrated to lower power always according to the type of probe；Multiple ADC samplings are carried out to each power points and are averaged；Corresponding relation deposit form by the performance number of all calibration power points and ADC values is original calibrated form.
- A kind of 8. temperature compensation of peak power probe as claimed in claim 5, it is characterised in that the step (3) In, the method for calculating the temperature compensation coefficient under each power points of original calibrated form is specially：If power P adjacent power points (P of any two in measured power pointm,Pm+1) between, and its corresponding temperature system Number is respectively (TCm,TCm+1), then：<mrow> <mi>T</mi> <mi>C</mi> <mo>=</mo> <msub> <mi>TC</mi> <mi>m</mi> </msub> <mo>+</mo> <mfrac> <mrow> <mi>P</mi> <mo>-</mo> <msub> <mi>P</mi> <mi>m</mi> </msub> </mrow> <mrow> <msub> <mi>P</mi> <mrow> <mi>m</mi> <mo>+</mo> <mn>1</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>P</mi> <mi>m</mi> </msub> </mrow> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>TC</mi> <mrow> <mi>m</mi> <mo>+</mo> <mn>1</mn> </mrow> </msub> <mo>-</mo> <msub> <mi>TC</mi> <mi>m</mi> </msub> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
- A kind of 9. temperature compensation of peak power probe as claimed in claim 5, it is characterised in that the step (3) In, the method for calculating the temperature compensation coefficient under each power points of original calibrated form is specially：If the value of power P is on maximum measured power point, the temperature coefficient corresponding to directly with maximum sampled power point； I.e.：TC=TCn-1。
- A kind of 10. temperature compensation of peak power probe as claimed in claim 5, it is characterised in that the step (3) In, the method for calculating the temperature compensation coefficient under each power points of original calibrated form is specially：If the value of power P is under minimum measured power point, directly with two minimum sampled power point (P0,P1) enter row interpolation Extension downwards, corresponding temperature coefficient are respectively (TC0,TC1), then：<mrow> <mi>T</mi> <mi>C</mi> <mo>=</mo> <msub> <mi>TC</mi> <mn>0</mn> </msub> <mo>+</mo> <mfrac> <mrow> <mi>P</mi> <mo>-</mo> <msub> <mi>P</mi> <mn>0</mn> </msub> </mrow> <mrow> <msub> <mi>P</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>P</mi> <mn>0</mn> </msub> </mrow> </mfrac> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>TC</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>TC</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
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Application publication date: 20180109 |