CN204165669U - A kind of temperature voltage conversion equipment for rf power measurement - Google Patents
A kind of temperature voltage conversion equipment for rf power measurement Download PDFInfo
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- CN204165669U CN204165669U CN201420472007.9U CN201420472007U CN204165669U CN 204165669 U CN204165669 U CN 204165669U CN 201420472007 U CN201420472007 U CN 201420472007U CN 204165669 U CN204165669 U CN 204165669U
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Abstract
The utility model discloses a kind of temperature voltage conversion equipment for rf power measurement, this device comprises operating load interface, reference load interface, the first thermistor be arranged on operating load interface, the first power-balance bridge modules comprising the first thermistor, the first differential amplifier module, the second thermistor be arranged on reference load interface, for reflecting reference load temperature conditions, the second power-balance bridge modules comprising the second thermistor, the second differential amplifier module and operational amplifier by resistance both end voltage.Technical scheme described in the utility model can meet the requirement of rf power measurement standard, has good applicability, ensure that high sensitivity and the long-time stability of radio frequency power measurement, and then has ensured the accurate and reliable of radio-frequency power transmission of quantity value.
Description
Technical field
The utility model relates to a kind of voltage conversion device, particularly relates to a kind of temperature voltage conversion equipment for rf power measurement.
Background technology
Temperature voltage conversion equipment utilizes the resistance of thermistor, with the characteristic of temperature change, temperature variation is converted to change in voltage, convert through DC-isolation again, obtain the direct voltage output corresponding to measured point temperature, temperature signal is converted to d. c. voltage signal and is transferred to Displaying Meter after AD conversion, realize the accurate measurement of temperature and control, can be widely used in machinery, electrically, telecommunications, electric power, oil, chemical industry, the field such as wastewater treatment and building construction the industry measurement and control system such as data acquisition, Signal transmissions conversion, PLC.
At present, the microwave power measurement standard majority that various countries set up adopts calorimetric mode, this theory application is very ripe, very high accuracy of measurement can be obtained, some external research on standard mechanisms are as America NI ST, Britain NPL, Japanese NMIJ, German PTB etc. the corresponding Low Power Standard started lower than 10MHz that all adopts calorimeter to establish frequency, and the principle of work of standard uses the principle of pair load type calorimeter structure substantially.Domestic frequency of also not setting up is lower than the shaft power source benchmark of 10MHz and transmission of quantity value standard, along with microwave power metering technology is gradually towards being applicable to the low power development and requirement of low-frequency range, in the realization of low-frequency range miniwatt radio frequency calorimeter and calibration, the precision and stability of power measurement is had higher requirement.In two load radio frequency calorimeter structure, by absorbing the calorimetric body of radio-frequency (RF) energy and the thermistor on reference quantity hot body surface power up to being close to, by temperature voltage conversion equipment, the temperature difference between two calorimetric bodies is transformed into electric potential difference, and then the size of radio-frequency power added by radio frequency calorimeter can be obtained by measuring electric potential difference.But there is certain defect for during rf power measurement in existing temperature voltage conversion equipment, as: the measurement sensistivity 1) for miniwatt radiofrequency signal is low; 2) Measurement sensibility is poor, can not meet the needs of rf power measurement completely.
Therefore, need to provide a kind of temperature voltage conversion equipment, to meet the requirement to measurement sensistivity and stability in rf power measurement process.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of temperature voltage conversion equipment for rf power measurement, to solve the problem of the low and poor stability of rf power measurement flexibility ratio in prior art.
For solving the problems of the technologies described above, the utility model adopts following technical proposals.
For a temperature voltage conversion equipment for rf power measurement, this device comprises
Operating load interface and reference load interface;
Be arranged on the first thermistor on operating load interface, for reflecting operating load temperature variations in real time by resistance both end voltage situation of change;
Comprise the first power-balance bridge modules of the first thermistor, for according to the first thermistor both end voltage with operating load temperature variations, again to electric bridge equilibrium establishment;
First differential amplifier module, according to the equilibrium state that the first power-balance bridge modules re-establishes, exports current voltage;
Be arranged on the second thermistor on reference load interface, for reflecting reference load temperature conditions by resistance both end voltage;
Comprise the second power-balance bridge modules of the second thermistor, for according to the second thermistor both end voltage, keep the equilibrium state of current electric bridge;
Second differential amplifier module, for the equilibrium state according to the second power-balance bridge modules, exports constant voltage;
Operational amplifier, for the output voltage voltage difference according to the first differential amplifier module and the second differential amplifier module, thus obtains the relation of output voltage and temperature variation.
Preferably, described first thermistor and the second thermistor adopt film class Pt100 or film class Pt1000 as temperature-sensing element.
Preferably, this device comprises the constant current source module be connected in series with the first hot side resistance and the second thermistor further.
Preferably, described constant current source module comprises differential amplifier, operational amplifier, reference voltage source and precision metallic sheet resistance.
Preferably, the precision of described constant current source module is 1mA.
Preferably, this device comprises the Displaying Meter module being connected to operational amplifier module output terminal further.
Preferably, this device comprises the analog to digital conversion module be connected between operation amplifier module and Displaying Meter module further.
Preferably, two current feeds of described thermistor and constant current source model calling, another two lead-in wire access power balanced bridges, form four-line measurement method.
The beneficial effects of the utility model are as follows:
Technical scheme described in the utility model can meet the requirement of rf power measurement standard, has good applicability, ensure that high sensitivity and the long-time stability of radio frequency power measurement, and then has ensured the accurate and reliable of radio-frequency power transmission of quantity value.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail;
Fig. 1 illustrates the schematic diagram of a kind of temperature voltage conversion equipment for rf power measurement described in the utility model.
Embodiment
Below in conjunction with one group of embodiment and accompanying drawing, the utility model is described further.
The utility model discloses a kind of temperature voltage conversion equipment for rf power measurement, this device comprises constant current source module 1, operating load interface 2, reference load interface 3, first thermistor 4, second thermistor 5, first power-balance bridge modules 6, second power-balance bridge modules 7, first differential amplifier module 8, second differential amplifier module 9, operational amplifier module 10, analog to digital conversion module 11 and Displaying Meter module 12.Constant current source module 1 is connected with the first thermistor 4 and the second thermistor 5, for the first thermistor 4 and the second thermistor 5 provide steady current.First thermistor 4 is arranged on operating load interface 2, the first power-balance bridge modules 6 is accessed from its double-end two wires, as a brachium pontis of the first power-balance bridge modules 6, the positive input terminal of the first differential amplifier module 8 and negative input end are connected into the first power-balance bridge modules 6, export the voltage variety of the first power-balance bridge modules 6; Second thermistor 5 is arranged on reference load interface 3, the second power-balance bridge modules 7 is accessed from its double-end two wires, as a brachium pontis of the second power-balance bridge modules 7, the positive input terminal of the second differential amplifier module 9 and negative input end are connected into the second power-balance bridge modules 7, export the voltage variety of the second power-balance bridge modules 7; Utilize operational amplifier module 10 by poor for the voltage variety of the voltage variety of the first power-balance bridge modules 7 and the second power-balance bridge modules 9, obtain the relation of voltage and temperature variation.The voltage exported, by after analog to digital conversion module 11, is input to Displaying Meter module 12.The utility model utilizes the resistance of thermistor with the characteristic of temperature change, temperature variation to be converted to the principle of change in voltage, adopts the power measurement electric bridge of two thermistor structure composition to realize.The utility model by the resistance of thermistor with centered by the characteristic of temperature change, the high precision of high precise current source output current and high stability is utilized to power for the thermistor of four-wire system connection, simultaneously, in order to ensure the stability of measurement result, by power-balance electric bridge, temperature variation is converted to the change of DC voltage, to reduce the impact of platinum resistive element generates its own heat on temperature-measuring results.The temperature voltage conversion equipment that this device realizes can measure microwatt level radio frequency miniwatt, and measurement sensistivity is high, good stability and little by the impact of ambient temperature.
The utility model adopts platinum resistance temperature sensor as warming device, this sensor has good reappearance and stability, and temperature range is wide,-200 DEG C ~ 650 DEG C can be reached, be widely used in industrial thermometric and Aero-Space precision temperature fields of measurement, and be made into standard thermometer for metering and calibration.Owing to needing to guarantee that thermistor is heated evenly during rf power measurement, measuring accuracy is high, thus selects film class Pt100 or film class Pt1000 as temperature-sensing element.High-precision four-line measurement technology is adopted in the utility model, by constant current source for platinum resistance two lead-in wires provide steady current, measured the voltage drop at platinum resistance two ends by another two lead-in wires, realize the voltage measurement to platinum resistance two ends by precision instrument amplifier.This method effectively can be eliminated platinum resistance and to go between the measuring error caused, and temperature measurement accuracy reaches less than 0.015 DEG C, and multichannel consistance is better than 0.01 DEG C, meets the requirement of rf power measurement.The high-precision constant flow source circuit that the utility model adopts is made up of differential amplifier, operational amplifier, reference voltage source and precision metallic sheet resistance etc., this constant-current source circuit has the current handling capability of relative broad range, wider range of current can be exported, the Low-bias Current characteristic simultaneously had make it can with high impedance load interface, and obvious offset error can not be introduced, less output noise, the drift of maximum offset voltage, maximum gain drift and temperature drift can be obtained simultaneously.
Temperature voltage conversion equipment described in the utility model and radio frequency calorimetric load seat, and outside good temperature control and heat-proof device, can form the radio frequency calorimeter of high measurement sensitivity and stability, realizing rf power measurement scope is 10uW ~ 50mW, and frequency range is DC ~ 18GHz.Temperature voltage conversion equipment of the present utility model can be widely used in rf power measurement standard at different levels, is indispensable standard device in radio-frequency power metering calibrating and calibration system.
The principle of work of temperature voltage conversion described in the utility model: first two film class Pt100 or film class Pt1000 heat conductive silica gel are attached to respectively the operating load and reference load bottom that absorb heat, four-wire system connection is adopted respectively two of two thermistors current feeds and high precision constant current source module 1 to be together in series, another two voltage lead access power balanced bridges.When operating load absorbs radio-frequency power, temperature can rise, and the first thermistor 4 being attached to its rear end can be risen by the same temperature of heat transfer, causes its resistance to become large.Because high precise current source output current is constant, thus the voltage at the first thermistor 4 two ends can become large, and the first power bridge modules 6 of connection first thermistor 4 can be made to re-establish new balance, causes the output voltage of the first differential amplifier module 8 to become large.Reference load does not absorb radio-frequency power simultaneously, its temperature can not change, second power-balance bridge modules 7 still keeps original equilibrium state, the output of the second differential amplifier module 9 is remained unchanged, the output voltage of final operational amplifier 10 module can become large, makes its output voltage and temperature variation opening relationships.Again after analog to digital conversion module 11, gained output voltage is presented in Displaying Meter module 12.
Implementation step:
A) two film class Pt100 or film class Pt1000 heat conductive silica gel are attached to respectively the operating load absorbing heat and reference load bottom;
B) operating load and reference load are positioned in same encapsulated space, treat that two load temperatures are stablized;
C) add the required radio-frequency power measured by transmission line to operating load, treat that operating load absorbs the rising of radio-frequency power temperature and again arrives stable;
D) after the DC voltage exported power-balance electric bridge through two-stage amplifier is amplified, by AD conversion module, final measured DC voltage numerical value is presented in Displaying Meter;
E) by the relation that output DC voltage and temperature variation are set up, the size of operating load temperature variation can be obtained.
In sum, temperature voltage conversion equipment of the present utility model adopts high-precision constant current source, its precision can reach 0.01% (1mA), both can ensure the measurement sensistivity of temperature voltage conversion equipment to miniwatt radiofrequency signal, the measurement range to miniwatt radiofrequency signal can have been expanded again.Have employed two thermistor temperature detecting structure, can guarantee that measured temperature is subject to the impact of environment temperature little, thermistor is selected has the high and film class Pt100 of the characteristic such as high pressure resistant or film class Pt1000 of positive temperature coefficient (PTC), good stability, accuracy, one of them thermistor is attached at operating load and absorbs heat, another thermistor is attached at reference load and absorbs heat, adopt high-precision four-line measurement technology simultaneously, by constant current source for platinum resistance two lead-in wires provide steady current, measured the electric potential difference at thermistor two ends by another two lead-in wires.What metering circuit adopted is power bridge structure, is connected to by thermistor on one of them brachium pontis, and when thermistor absorbs heat change in resistance, power-balance electric bridge can guarantee Measurement sensibility.Adopt that measurement device described in the utility model is highly sensitive, Measurement sensibility is good, rf power measurement standard can be widely used in, the power measurement to low-frequency range low-power level signal can be realized.
Obviously; above-described embodiment of the present utility model is only for the utility model example is clearly described; and be not the restriction to embodiment of the present utility model; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to the technical solution of the utility model the apparent change of extending out or variation be still in the row of protection domain of the present utility model.
Claims (8)
1. for a temperature voltage conversion equipment for rf power measurement, it is characterized in that, this device comprises operating load interface and reference load interface;
Be arranged on the first thermistor on operating load interface, for reflecting operating load temperature variations in real time by resistance both end voltage situation of change;
Comprise the first power-balance bridge modules of the first thermistor, for according to the first thermistor both end voltage with operating load temperature variations, again to electric bridge equilibrium establishment;
First differential amplifier module, according to the equilibrium state that the first power-balance bridge modules re-establishes, exports current voltage;
Be arranged on the second thermistor on reference load interface, for reflecting reference load temperature conditions by resistance both end voltage;
Comprise the second power-balance bridge modules of the second thermistor, for according to the second thermistor both end voltage, keep the equilibrium state of current electric bridge;
Second differential amplifier module, for the equilibrium state according to the second power-balance bridge modules, exports constant voltage;
Operational amplifier, for the output voltage voltage difference according to the first differential amplifier module and the second differential amplifier module, thus obtains the relation of output voltage and temperature variation.
2. temperature voltage conversion equipment according to claim 1, is characterized in that, described first thermistor and the second thermistor adopt film class Pt100 or film class Pt1000 as temperature-sensing element.
3. temperature voltage conversion equipment according to claim 1, is characterized in that, this device comprises the constant current source module be connected in series with the first hot side resistance and the second thermistor further.
4. temperature voltage conversion equipment according to claim 3, is characterized in that, described constant current source module comprises differential amplifier, operational amplifier, reference voltage source and precision metallic sheet resistance.
5. temperature voltage conversion equipment according to claim 3, is characterized in that, the precision of described constant current source module is 1mA.
6. temperature voltage conversion equipment according to claim 1, is characterized in that, this device comprises the Displaying Meter module being connected to operational amplifier module output terminal further.
7. temperature voltage conversion equipment according to claim 6, is characterized in that, this device comprises the analog to digital conversion module be connected between operation amplifier module and Displaying Meter module further.
8. temperature voltage conversion equipment according to claim 3, is characterized in that, two current feeds of described thermistor and constant current source model calling, and another two lead-in wire access power balanced bridges, form four-line measurement method.
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| CN201420472007.9U CN204165669U (en) | 2014-08-20 | 2014-08-20 | A kind of temperature voltage conversion equipment for rf power measurement |
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| CN201420472007.9U CN204165669U (en) | 2014-08-20 | 2014-08-20 | A kind of temperature voltage conversion equipment for rf power measurement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793048A (en) * | 2015-04-14 | 2015-07-22 | 清华大学 | Matcher loss power calculating method and device |
| CN104914298A (en) * | 2014-12-30 | 2015-09-16 | 北京无线电计量测试研究所 | Power measurement device for radio frequency calorimeter |
| CN105068031A (en) * | 2015-08-11 | 2015-11-18 | 工业和信息化部电子工业标准化研究院 | Standard sample wafer for microwave probe calibration |
| CN105388443A (en) * | 2015-12-23 | 2016-03-09 | 北京无线电计量测试研究所 | Linear feedback self-regulation system for calorimetric power meter |
-
2014
- 2014-08-20 CN CN201420472007.9U patent/CN204165669U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914298A (en) * | 2014-12-30 | 2015-09-16 | 北京无线电计量测试研究所 | Power measurement device for radio frequency calorimeter |
| CN104793048A (en) * | 2015-04-14 | 2015-07-22 | 清华大学 | Matcher loss power calculating method and device |
| CN105068031A (en) * | 2015-08-11 | 2015-11-18 | 工业和信息化部电子工业标准化研究院 | Standard sample wafer for microwave probe calibration |
| CN105068031B (en) * | 2015-08-11 | 2018-07-17 | 工业和信息化部电子工业标准化研究院 | A kind of microwave probe calibration standard print |
| CN105388443A (en) * | 2015-12-23 | 2016-03-09 | 北京无线电计量测试研究所 | Linear feedback self-regulation system for calorimetric power meter |
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