CN1119665C - Miniature protable microwave high power meter - Google Patents
Miniature protable microwave high power meter Download PDFInfo
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- CN1119665C CN1119665C CN 00112613 CN00112613A CN1119665C CN 1119665 C CN1119665 C CN 1119665C CN 00112613 CN00112613 CN 00112613 CN 00112613 A CN00112613 A CN 00112613A CN 1119665 C CN1119665 C CN 1119665C
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Abstract
The present invention discloses a portable miniaturized high-power microwave meter which comprises high-power sampling-type measuring head, high-stability wave detector and a single chip computer for automatic conversion and indication, which are electrically connected with each other. The sampling-type measuring head is formed by that a sampling and coupling mechanism and a water load are directly combined on the same element, wherein a series of in-line water pipes which are arrayed according to a certain law are used as water loads, and thus, the volume and the weight of water loads are largely reduced; a coupling probe and a coupling ring or a small hole is used as the sampling and coupling mechanism. By the combination of the water loads and the coupling mechanism, the high-power microwave meter realizes miniaturization and portability.
Description
Technical field
The invention belongs to microwave technical field, particularly microwave measuring instrument.
Background technology
Power is one of most important parameter of microwave oscillation, thereby the measurement of microwave power is requisite a kind of measurement in any microwave measurement, and microwave power meter also becomes one of most important instrument in the microwave measurement.The microwave high power meter that the present invention relates to is meant that the average power magnitude is from several watts to tens of kilowatts microwave power measurement instrument.Under such power level, all be to utilize the absorber of water as microwave, with water load as measuring head, by to the flow of water and the measurement of the temperature rise after absorbing microwave just can calculate the size of microwave power.That is to say that at this moment the water load in the measuring head should be undertaken the function of the microwave that absorbs big average power, also play a part to measure this watt level simultaneously.In existing actual microwave high power meter, instable influence for fear of discharge, improve measuring accuracy, on the one hand substitute measurement to discharge by measurement to the calibrated resistance heating power, when the temperature rise that causes behind the temperature rise of the water that calibrated resistance heating is caused and the water absorption microwave was consistent, the heating power size of resistance was exactly the microwave power size; On the other hand, also adopted circulation, made current not influenced by the peripheral hardware public water facilities.Just because of this, existing microwave high power meter also all includes calibrated resistance and adjustable heating power supply thereof except measuring head, the thermocouple heap of the temperature rise of measurement water and amplification thereof, indication mechanism, and water pump and water circulation systems such as power supply, water tank even heating radiator thereof, as shown in Figure 1.Thereby make the bulky of high power meter, the structure bulky complex is used inconvenience, the also corresponding raising of cost.For example: the GLCD-2 type high power meter of measurement 5W～2KW range of microwave power that China northern Suzhou Electronic Instruments Plant produces, together with the heavy altogether 60KG (weight that does not comprise water) of heating radiator, volume is 635 * 410 * 390mm
3+ 427 * 296 * 294mm
3The GD-9 high power meter of measurement 500W～10KW range of microwave power that this factory produces, general assembly (TW) reaches 185KG (weight that does not comprise water), and volume reaches 620 * 580 * 990mm
3+ 800 * 140 * 240mm
3Because the intensification in the existing microwave high power meter behind the water load absorption microwave has a thermal equilibrium process, and the measured value of microwave power always need be lagged behind the actual value quite a while, can't measure the real power in the system under test (SUT) in real time.
The books that some are relevant with microwave measurement as asking a work " Microwave Measurement Technique " week, were mentioned the measuring method of another kind of big average power microwave in the Dong Shuyi work " microwave measurement ", promptly so-called expansion miniwatt metering journey method.This method utilizes the directional coupler sub-fraction microwave power that is coupled from the microwave main road to come out, measure the size of this power with miniwatt, converse power in the main road according to the degree of coupling of directional coupler again, most microwave powers in the main road then absorb with water load in addition, as shown in Figure 2.In this method; water load is no longer undertaken the function of power measurement; and only work to absorb microwave; thereby the measurement of calibrated resistance and heating power thereof at this moment; the measurement and a whole set of water circulation system of thermocouple heap and temperature rise thereof can no longer need; but because water load and directional coupler are two elements independently separately; but also need to use the miniwatt meter and do not damaged the attenuator that is provided with for the measuring head of protection miniwatt meter by excessive power; make the volume of this measuring system; weight and cost are still quite big; use also very inconvenient; thereby this method only has a small amount of use at present in the laboratory; be difficult to be combined into the HIGH-POWERED MICROWAVES surveying instrument of independent completion; therefore it is a kind of measuring method, rather than surveying instrument. in fact do not seen such microwave high power meter so far really yet.
No matter be in the measuring head of existing microwave high power meter, still in expansion miniwatt meter mensuration, what all use is traditional water load.This load total length is longer, and for example the length of the water load of GLCD-2 power meter reaches more than 400 millimeter, and the water load of GD-9 power meter then length reaches 800 millimeters, therefore, has the bulky, heavy of microwave high power meter now, the cost height.
Summary of the invention
The purpose of this invention is to provide a kind of little, the lightweight miniature protable microwave high power meter of microwave real power, volume that can measure in real time in the system under test (SUT).
A kind of miniature protable microwave high power meter of the present invention, it is characterized in that: it comprises HIGH-POWERED MICROWAVES sampling formula measuring head, high stable wave detector, the single-chip microcomputer automated power converts and indication, be electrical connection between them, described HIGH-POWERED MICROWAVES sampling formula measuring head is combined with the sampling coupling mechanism that carries out power measurement by the water load that absorbs big average power microwave to be formed.
Sampling coupling mechanism in the HIGH-POWERED MICROWAVES sampling formula measuring head recited above is made up of coupling probe, also can be made up of coupling ring, also can be made up of the coupling aperture.The sampling coupling mechanism can directly be made on the water load.Water load in the described HIGH-POWERED MICROWAVES sampling formula measuring head is made up of a series of direct insertion water pipes perpendicular to wave guide wall, the arrangement of water pipe can be the notch cuttype linear array, it also can be curved arrangement according to certain rules, spacing between the water pipe can be uniformly, also can be heterogeneous.
Need to prove that at the port of described HIGH-POWERED MICROWAVES sampling formula measuring head an allotment mechanism is set, allotment mechanism is made up of the allotment screw, also can be made up of matching window.
The object of the present invention is achieved like this: utilize a kind of small-sized high-power Microwave Sampling formula measuring head, high stable wave detector, single-chip microcomputer automated power to convert and indication, be electrical connection between them, thereby realize the power measurement to big average power microwave.Small-sized high-power Microwave Sampling formula measuring head is made up of miniaturization water load and coupling mechanism, wherein water load is made up of a series of direct insertion water pipes perpendicular to wave guide wall of arranging according to certain rules, its total length is shortened greatly than traditional water load, it will absorb most tested microwave powers, convert heat to and be taken away by water; The sampling coupling mechanism is probe, coupling ring or an aperture more than the much smaller coaxial output of directional coupler, and the sampling coupling mechanism directly is made on the water load, and its very little a part of microwave power that is coupled from tested microwave system comes out to deliver to wave detector and carries out detection; The high stable wave detector microwave miniwatt that coupling mechanism is coupled out of will taking a sample is carried out detection, detection goes out low frequency or DC current, and monolithic processor controlled signal processing circuit will be converted into the microwave power size in the system under test (SUT) to electric current automatically according to the detection characteristic of the degree of coupling of the coupling mechanism of prior demarcation and wave detector and indicate.As shown in Figure 3.
Principle of the present invention is: utilize a kind of small microwave sampling formula measuring head, it is combined with the sampling coupling mechanism that carries out power measurement by the water load that absorbs big average power microwave forms, thereby the function of water load absorption microwave in the existing microwave high power meter and the function of microwave power measurement are separated.Because at this moment water load only need be born the function that absorbs microwave power, need not to carry out the size that any direct or alternative measurement obtains microwave power by flow and temperature rise to water, thereby calibrated resistance and heating power supply thereof, thermocouple heap and amplify indicating circuit etc. and no longer need; In addition, the size of current and self temperature in the water load, water are all no longer relevant with power measurement to whether stablizing of the factors such as absorptive character of microwave, thereby the circulation system of water is equally no longer necessary, can directly utilize the water source of the water system of public water facilities or any other form as water load easily; Water load in the measuring head is with traditional oblique cutting waterpipe type or tiltedly split the hydroecium formula or tapered bubble form changes according to certain rules some straight cutting water pipes of arranging into, thereby single high capacity water absorbent is changed into the combination of plurality of small-capacity water pipe absorber, the total length of water load can be shortened greatly, realize miniaturization, its length can be controlled at below 200 millimeters; Simultaneously, in the water pipe circulation of current very abundant, the dead band of having eliminated current in the measuring head water load of existing microwave high power meter is improved the absorption efficiency of the microwave power of water, thereby the water load volume is reduced; Sampling coupling mechanism in the measuring head is made of the coupling probe with coaxial output or coupling ring or coupling aperture since they directly and water load combine, account for independent volume hardly, thereby independent directional coupler and attenuator need no longer; And the miniwatt that is coupled out by a certain percentage via this sampling coupling mechanism, also no longer need to measure with the miniwatt meter this moment, but directly utilize the detector via detection of high stability to convert low frequency or DC current to, and input single-chip microcomputer, the detection characteristic of the sampling degree of coupling of coupling mechanism and wave detector deposits data in single-chip microcomputer in advance after demarcating, thereby utilizes monolithic processor controlled signal Processing and indicating circuit that demodulation current directly is converted into the microwave power size in the system under test (SUT) automatically and indicate.As shown in Figure 3.
Like this, owing to cancelled calibrated resistance and heating power supply, thermocouple heap and water circulation systems such as interlock circuit, water pump, water tank and heating radiator thereof, realized the miniaturization of water load with the integrated and water load of sampling coupling mechanism itself, directional coupler, attenuator and miniwatt meter are also no longer needed, thereby microwave high power meter proposed by the invention reduces greatly than volume, the weight of existing high power meter, and cost descends at double.The 5KW magnitude microwave high power meter weight that the present invention proposes is no more than 10KG, and volume has only 300 * 200 * 180mm
3, also lighter and little than a measuring head of existing high power meter, thus make microwave high power meter realize miniaturization, portable.In addition, with from the Narrow Wall of Waveguide limit or the vertical some water pipes that insert of broadside have very big dirigibility as the absorbing load of microwave, size and water system situation according to required absorption microwave power, the quantity of water pipe and arrangement regulation can be adjusted when the design water load, water pipe can be the notch cuttype linear array, also curved arrangement according to certain rules, spacing between the water pipe can be uniform, also can be uneven, the water supply of each water pipe also can be carried out the series and parallel combination easily.In order to improve or adjust the matching performance of measuring head, can near the input port of measuring head, allotment mechanism be set, as allotment screw or matching window etc., as Fig. 4, shown in Figure 5.Because the detection of wave detector, the conversion of single-chip microcomputer, indication can be finished in moment, thereby the present invention can measure the size of the power that transmits in the system under test (SUT) in real time, having overcome heats up after water load absorbs microwave in existing microwave high power meter a thermal equilibrium process, the performance number of measuring by the measurement temperature rise is lagged behind the actual value quite a while always, can't measure the shortcoming of real power in real time.The high stable wave detector can be a transistor detector, also can be transrectifier.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is existing microwave high power meter fundamental diagram,
Wherein: the 1st, the indication of calibrated resistance heating power, the 2nd, calibrated resistance, the 3rd, tested microwave power indication, the 4th, thermocouple heap, the 5th, water tank, the 6th, cooling fan, the 7th, Draw off valve, the 8th, water pump, the 9th, measuring head;
In Fig. 1, measuring head 9 is exactly a water load.
Fig. 2 is the systematic schematic diagram that expansion miniwatt metering journey method is measured microwave high power,
Wherein: the 10th, microwave power source, the 11st, directional coupler, the 12nd, attenuator, the 13rd, microwave miniwatt meter, the 14th, water load;
Fig. 3 is a miniature protable microwave high power meter fundamental diagram of the present invention,
Wherein: the 15th, sampling formula measuring head, the 16th, wave detector, the 17th, monolithic processor controlled signal processing circuit, the 18th, power indication;
Fig. 4 is the sampling formula measuring head synoptic diagram among the embodiment 1,
Wherein: the 19th, coaxial out splice going splice, the 20th, waveguide, the 21st, water pipe, the 22nd, coupling probe, the 23rd, allotment screw;
Fig. 5 is the sampling formula measuring head synoptic diagram among the embodiment 2,
Wherein: the 19th, coaxial out splice going splice, the 20th, waveguide, the 21st, water pipe, the 24th, coupling ring, the 25th, matching window.
Embodiment embodiment 1: in Fig. 4, four water pipes 21 insert from the narrow limit of microwave waveguide 20 and become stepped linear array, form water load, absorb the most microwave powers that enter in the measuring head; Allotment screw 23 is used for improving or adjusting the matching performance of measuring head; Coupling probe 22 is coupled out the sub-fraction microwave power from microwave waveguide 20 be sample-power, and sample-power is delivered to high stable wave detector 16 among Fig. 3 through coaxial out splice going splice 19.In Fig. 3, this sub-fraction Microwave Sampling power becomes low frequency or dc signal after by high stable wave detector 16, and this electric signal is handled the back by monolithic processor controlled signal processing circuit 17 and indicated in power number word indicator 18.Embodiment 2: in Fig. 5, six roots of sensation water pipe 21 inserts and becomes 90 ° of cosine curves in the scope to arrange from the broadside of microwave waveguide 20, forms water load, absorbs the most microwave powers that enter in the measuring head; Matching window 25 is used for improving or adjusting the matching performance of measuring head; Coupling ring 24 is coupled out the sub-fraction microwave power from microwave waveguide 20 be sample-power, and sample-power is delivered to high stable wave detector 16 among Fig. 3 through coaxial out splice going splice 19.In Fig. 3, this sub-fraction Microwave Sampling power becomes low frequency or dc signal after by high stable wave detector 16, and this electric signal is handled the back by monolithic processor controlled signal processing circuit 17 and indicated in power number word indicator 18.
Claims (4)
1. miniature protable microwave high power meter, it is characterized in that: it comprises HIGH-POWERED MICROWAVES sampling formula measuring head, high stable wave detector, the single-chip microcomputer automated power converts and indication, be electrical connection between them, described HIGH-POWERED MICROWAVES sampling formula measuring head is combined with the sampling coupling mechanism that carries out power measurement by the water load that absorbs big average power microwave to be formed.
2. a kind of miniature protable microwave high power meter according to claim 1 is characterized in that the coupling mechanism in the described HIGH-POWERED MICROWAVES sampling formula measuring head is made up of coupling probe, also can be made up of coupling ring, also can be made up of the coupling aperture.
3. a kind of miniature protable microwave high power meter according to claim 1, it is characterized in that the water load in the described HIGH-POWERED MICROWAVES sampling formula measuring head is made up of a series of direct insertion water pipes perpendicular to wave guide wall, the arrangement of water pipe can be the notch cuttype linear array, it also can be curved arrangement according to certain rules, spacing between the water pipe can be uniformly, also can be heterogeneous.
4. according to claim 1 or the described a kind of miniature protable microwave high power meter of claim 3, it is characterized in that an allotment mechanism being set at the port of described HIGH-POWERED MICROWAVES sampling formula measuring head, allotment mechanism is made up of the allotment screw, also can be made up of matching window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112613 CN1119665C (en) | 2000-01-11 | 2000-01-11 | Miniature protable microwave high power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112613 CN1119665C (en) | 2000-01-11 | 2000-01-11 | Miniature protable microwave high power meter |
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| Publication Number | Publication Date |
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| CN1304044A CN1304044A (en) | 2001-07-18 |
| CN1119665C true CN1119665C (en) | 2003-08-27 |
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| CN 00112613 Expired - Fee Related CN1119665C (en) | 2000-01-11 | 2000-01-11 | Miniature protable microwave high power meter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101566650B (en) * | 2008-04-21 | 2011-01-19 | 东莞市光华实业有限公司 | Heat loss self-compensating terminal type water load microwave high power meter |
| CN101726659B (en) * | 2008-10-28 | 2012-07-04 | 西安恒达微波技术开发公司 | Microwave high power testboard |
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