CN2694286Y - Probe used for constant-speed rotating upside-down mounting type electric field instrument - Google Patents
Probe used for constant-speed rotating upside-down mounting type electric field instrument Download PDFInfo
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- CN2694286Y CN2694286Y CN 03249080 CN03249080U CN2694286Y CN 2694286 Y CN2694286 Y CN 2694286Y CN 03249080 CN03249080 CN 03249080 CN 03249080 U CN03249080 U CN 03249080U CN 2694286 Y CN2694286 Y CN 2694286Y
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Abstract
The utility model relates to a probe used for a constant-speed rotating upside-down mounting type electric field instrument, suitable for being used for the detection of the thunder electricity and near ground atmosphere electricity environments. The utility model comprises an upside-down arranging type L-shaped support frame in which cables provided with a plug is penetrated. The bottom end of the support frame is fixed on a base, and the other end port of the support frame is communicated with the convex opening of the external housing. The inner wall of the support frame fixed with a socket is electrically connected with the internal connecting wire of the probe. A motor support base is provided with a motor whose shaft penetrates into an insulated post on a fixed frame and tightly matches with the insulated post. The outside of the insulated post is provided with a small blade, and the outside wall of the back end of the insulated post is tightly sheathed with a rotor fixing sleeve on which a rotor is fixed. The fixing cover passes through a component mounting base and the central hole of the stator which is fixed on the component mounting base. A preamplifier, a rotating speed and synchronous signal detection circuit board and an electric brush are fixed on a support base. The electric brush is contacted with the rotor fixing sleeve in a frictional contact way, and the rotating speed and synchronous signal detection circuit board is provided with a groove type photoelectric switch, so as to make the small blade 7 exactly be arranged at the central line position of the groove of the photoelectric switch. The detection data of the electric field instrument has high stability and reliability.
Description
Technical field
The utility model relates to a kind of constant speed and revolves rotary electric field instrument, particularly relates to a kind of thunder and lightning and electrostatic monitoring and early warning, the environmental monitoring of near-earth atmospheric electricity rotate the flip-over type electric field instrument with constant speed probe that is adapted to.
Background technology
At present, the common method of measurement atmospheric electric field mainly contains two classes (survey dark high aerial faint electric field and also have the electron drift method): first kind method is a potential differentiation.Promptly measure the potential difference (PD) of space point-to-point transmission, potential differentiation divides single probe (adopting single level balancer) and two probe (adopting two level balancers) mensuration again, the former generally is used for ground, measure some potential difference (PD) of face over the ground of hemisphere, at the radioactivity pot of the mid-1970s development just based on this principle, its advantage is simple, but is subject to the influence of environmental baseline (especially temperature), and radioactive contamination is arranged; The latter is used for the distance acquisition electric field of the potential difference (PD) of any point-to-point transmission of measurement space divided by point-to-point transmission, and two level balancers are made with conductor, and are installed in the end that is fixed on two booms in the flight respectively, and carry out electrical isolation with boom.As long as boom length is enough to avoid the plasma sheath that aircraft produces, can measure the electric field of mV/m magnitude, its advantage is highly sensitive, but the boom technical sophistication.Second class is the induced charge method, promptly utilize conductor induced charge principle in electric field to measure electric field, low baking temperature arrow electric field instrument, the ball of our development carries two ball electric field instruments, KDY-I, II, the rotary electric field instrument of III type, what adopt all is this method, its advantage measurement range is big, be convenient to Theoretical Calculation and to the demarcation of instrument, but the credibility of measuring accuracy and electric field data is influenced greatly by rotational speed, long-time stability is also poor.Also have a kind of ZL96250898.5 disclosed: a kind of inversion type electric field instrument, contain housing, motor, brush, stator, moving plate, signal lead and wiring board etc., on housing, be associated with reference seat, on positioning seat, following both sides are associated with motor frame and stator respectively, with the parallel moving plate that is associated on the motor shaft that is equipped with over against the position of stator, with the parallel simple Identification plate that is associated in lower cover that is equipped with over against the position of moving plate, on motor shaft, also be equipped with and the similar parallel vanelets of moving plate in addition, vanelets places in the breach of photoswitch, is inserted together in the electric field measurement signal processing circuit by the electric signal of optoelectronic switch output and the electric signal of the output of the signal lead on the stator.As document 1: the rotary electric field instrument of .KDY types such as Luo Fushan. electrical measurement and instrument, 1993,30 (4): 17-21.; No matter with regard to above-mentioned said most of electric field instrument positively fixed types or inversion type, its shortcoming is: 1, the general employing of the drive motor of electric field instrument has the brush direct current generator, its nominal operation time (as the aviation direct current generator) is 500 hours, be applied to lightning monitoring and early warning and the environmental monitoring of near-earth atmospheric electricity, this continuity work is unconformable.2, even the drive motor employing is general brshless DC motor and general circuit of motor speed regulation control based, shake is arranged, background is made an uproar greatly, rotating speed is big with supply voltage and load, variation of ambient temperature, and the drive motor change in rotational speed not only influences the measurement of electric field amplitude, also will influence the polarity of electric field.Simultaneously the shell of this motor is generally all used aluminium, can not shield electric machine in magnetic force to the influence of sensor, be unfavorable for improving instrumental sensitivity.3, the housing of instrument is an aluminium, and the sensitive surface of sensing instrument also generally adopts copper or aluminium, as only doing, handle, and environmental pollution more terrible area or salt fog area (using) as the coastland, easy oxidation and rusting, and outward appearance is also plain.4, water resistance is poor, and attachment plug, socket expose, and meeting the rainwater face has rigging screw.5, measurement point height overhead can not keep certain or sensor cover distance overhead too near because the measurement numerical value of electric field is overhead highly relevant with the set-point of instrument; As overhead too near, dabbling of ground also can influence the measurement of instrument simultaneously.6, complex structure, design drawing is many, the process and assemble trouble; Each small pieces of sensor and guard electrode all are dispersion processing assemblings, between being difficult to the maintenance group and organizing, the consistance of platform and interstation.7, adopt single brush, the signal transmission has shake, and the prime amplifier that measuring-signal is played crucial detection effect directly is contained in the probe, is subject to the measurement environment influence.8, for being that electric field signal and synchronizing signal are in same phase place, adopt the mechanical means phase modulation, very trouble, and difficult the adjustment.
Summary of the invention
The purpose of this utility model is to overcome the defective of existing rotating electric field instrument: for stability and reliability and the long-time continuous behavior in service that improves the rotating electric field instrument, thereby provide a kind of cable, plug and socket be installed in the bracing frame simple in structure, debugging is convenient, by stator and counter electrode be made of one form stator be suitable for thunder and lightning and the environmental monitoring of near-earth atmospheric electricity is rotated the flip-over type electric field instrument with constant speed.
The purpose of this utility model is realized by following technical scheme:
A kind of probe that is used for constant speed rotation flip-over type electric field instrument that the utility model provides comprises: shell 12, rotor 2, stator A, counter electrode B3, parts erection support 4, ground brush 5, vanelets 7, motor bearing 11, motor 13, probe internal wiring 16, cable 19, base 24, probe 36; It is characterized in that: also comprise: rotating speed and synchronization signal detection circuit plate 21; Groove (recessed) type optoelectronic switch 22; Motor speed controller 14; Prime amplifier 10, electrical isolation post 8; Brush carriage 6; Described stator A and counter electrode B3 are integral; Described bracing frame 20 is one to be inversion type L type metal tube, the bottom is fixed on the base 24, the another port is communicated with fixing with the tang suit that an end face has the cylindrical case 12 of tang, on its junction surface inwall, fix a cable socket 17, penetrate cable 19 in the pipe of bracing frame 20, and is connected with socket 17 by plug 18, cable socket 17 36 is electrically connected with popping one's head in by the internal wiring 16 of popping one's head in; The chamber internal fixation one motor bearing 11 of this cylindrical case 12 is installed dc brushless motor 13 on it, fix a motor speed control circuit 14 on this motor, and motor shaft 9 pierces in the insulated column 8, and with its wringing fit; Insulated column 8 outer walls are with the vanelets 7 (or appellation " rotating speed and synchronization signal generation apparatus ") of a generation synchronizing signal identical with 2 numbers of rotor, on insulated column 8 terminal outer walls, closely be with a rotor fixed cover 1, rotor is fixed on the rotor fixed cover, the center pit that the rotor fixed cover passes parts mount pad 4 and fixes the stator 3 on it also is equipped with prime amplifier 10 on parts erection support 4; Rotating speed and synchronization signal detection circuit plate 21 by circuit board fixing rack 23, are fixed on ground brush 5 and rotor fixed cover rubbing contact on the parts erection support 4, make rotor be in earth potential all the time; Be equipped with groove (recessed) type optoelectronic switch 22 on rotating speed and the synchronization signal detection circuit plate 21, make vanelets 7 just in time be in the midline position of the interior recess of groove of optoelectronic switch.
Described shell, overcoat and bracing frame are the stainless steel material making.
Described stator 3 is integral by (fan-shaped) shape identical stator A1 and counter electrode B2; counter electrode B (guard electrode; reduce electric field distortion) similar with the shape of stator (electric field induction electrode); and be integral with the mutual obforms cross arrangement of stator, its substrate surface plates a gold medal layer and the center has center pit.
Described prime amplifier is a low-noise preamplifier, comprising: I/V transducer 25, follower 26, voltage amplifier 27, Chief Signal Boatswain cable driver 28; Wherein the induced charge that is produced by stator (induction electrode) flows into the I/V transducer 25 of low-noise preamplifier, marking current is transformed into signal voltage is input to follower 26, follower be to the I/V transducer of prime and the back one-level voltage amplifier 27 between play buffer action, to reduce influencing each other between I/V transducer and the voltage amplifier, signal is input to signal cable driver 28 again after voltage amplifier amplifies, the effect of this grade provides the enough signal powers of long cable and reduces the influence of cable to pre-amplification circuit.
Described rotating speed and circuit for generating synchronous signals, it comprises vanelets 7, optoelectronic switch 22, pulse signal amplifier 29 and follower 30.When vanelets 7 rotations, phototriode in the Shi Errang optoelectronic switch 23 receives the light that sends from light emitting diode, the time and stop phototriode to receive the light of light emitting diode, go round and begin again like this and produce the small-pulse effect string, be input to the pulse that obtains enough amplitudes after pulse amplifier 29 amplifies, the main frame of sending into electric field instrument by cable through one of the electric field signal of follower 30 and low noise pre-amplification circuit carries out signal Processing.
Constant speed electric field instrument motor speed control of the present utility model adopts phaselock technique to carry out, it is described motor speed control circuit, the pulse signal that produces a standard frequency by crystal oscillator 31 with in phase comparator 32, carry out bit comparison mutually by rotating speed with the pulse signal of circuit for generating synchronous signals generation, if it is asynchronous, phase differential is just arranged, phase signal is through low-pass filter 33, obtain a direct current level increment or a decrement, the driving voltage that goes to control motor driver 34 with it makes it correspondingly to increase or reduce, thereby impels motor speed to increase or minimizing.When the frequency of motor 13 rotational speed pulse signals and phase place were identical with the standard frequency pulse signal that is produced by crystal oscillator fully, phase comparator is just thought did not have error signal to export, and motor driver is with the constant voltage level drive motor.
Advantage of the present utility model:
1. the motor A. of the constant speed rotation flip-over type electric field instrument that provides of utility model adopts long-life (more than 50,000 hours), no-spark, the special-purpose low-voltage direct brushless electric machine of low noise, magnetic force improves and measures sensitivity the influence of sensor motor housing in the motor to reduce with anti-magnetic material; B, employing has the alignment circuit of good decompression characteristic to torque, promptly use crystal frequency stabilization and phaselock technique brushless electric machine is realized stepless speed regulation, guarantee rotating speed under all weather operations environment constant-speed operation (at-30 ℃～+ 50 ℃, rotation speed change is about 0.6%), therefore improve the stability and the reliability of detection data greatly.
2. described motor 13 rotating speeds control adopts phaselock technique to carry out, and motor driver is realized the rotation of motor constant speed with the constant voltage level drive motor.
3. probe and installation support bar adopt stainless steel material, and make one-piece construction with erection support, make the distance on sensing point and ground remain at 1 meter, 1. in environmental pollution more terrible area or salt fog area (as the area, seashore), probe and installation support bar are difficult for oxidation and rusting, and outward appearance is also good-looking; 2. avoided because of Instrument sensor face present position dabbling of the different and ground of height overhead to the influence of measured value.
4 probe upstream face settings do not expose rigging screw but have, and probe is installed in the stainless steel support bar with the attachment plug socket of main frame, have avoided rainwater to infiltrate the operate as normal that probe influences instrument.
The shape (fan-shaped) of 5 counter electrodes (reducing electric field distortion) and stator (electric field induction electrode) is similar to rotor (electric field shielding electrode), and replacing arrangement with the mutual obforms of stator is formed on the same substrate, simplify processing and linkage editor, avoided the influence of inconsistency to measuring of each fanning strip in processing and the assembling process; And carry out surface gold-plating and handle, improve the homogeneity of work function.
6 adopt double brush ground connection, transfer out with making signal stabilization; Circuit such as preposition amplification are carried out three anti-processing, guarantee the credibility of measuring-signal.
The debugging simple in structure of 7 constant speed rotation flip-over type electric field instruments of the present utility model is convenient; The machine work drawing reduces by half, and under the situation that the machine work expense grows to even greater heights, the machine work expense is lower than the eighties, and sensitivity, linearity, reliability all have raising, have the good ratio of performance to price.
8 these electric field instruments adopt the electronic control phase method, conveniently, easily realize the purpose of accurate phase modulation.
9. this electric field instrument has the linear analogue amount, and the multiple way of output such as broken line analog quantity, digital quantity is selected for the user, in case when having monitored thunderbolt or shock hazard numerical value, send sound automatically, light is reported to the police.
Description of drawings:
Fig. 1 is a constant speed rotation flip-over type electric field instrument sonde configuration synoptic diagram of the present utility model
Fig. 2 is the stator structural representation in the constant speed rotation flip-over type electric field instrument probe of the present utility model
Fig. 3 is the low noise pre-amplification circuit block diagram in the electric field instrument probe of the present utility model
Fig. 4 is the synchronization signal detection circuit block diagram in the electric field instrument probe of the present utility model
Fig. 5 is the motor speed control circuit block diagram in the electric field instrument probe of the present utility model
The drawing explanation:
Rotor fixed mount-1 rotor-2 stator A and counter electrode B-3
Parts erection support-4 ground brush-5 brush carriage-6
Vanelets-7 electrical isolation post-8 motor shaft-9
Prime amplifier-10 motor bearing-11 shell-12
Motor-13 motor speed control panel-14 overcoat-15
Probe internal wiring-16 socket-17 plug-18
Cable-19 bracing frame-20 rotating speed and synchronization signal detection circuit plate-21
Groove (recessed) type optoelectronic switch-22 circuit board fixing rack-23 base-24
I/V transducer-25 follower-26 voltage amplifier-27
Chief Signal Boatswain cable driver-28 pulse signal amplifier-29 follower-30
Crystal oscillator-31 phase comparator-32 frequency divider-33
Low-pass filter-34 control motor driver-35
Embodiment
In conjunction with the accompanying drawings and embodiments the utility model is described in detail:
With reference to Fig. 1, a kind of constant speed inversion type electric field instrument of present embodiment comprises: an end face has the tubular stainless steel casing 12 of tang, one is the bracing frame 20 that inversion type L type stainless-steel tube is done, these bracing frame 20 bottoms are fixed on the base 24, the tang suit of another port and shell 12 is connected and fixed, and be communicated with fixing by a stainless steel outer sleeve 15 (protection be connected and fixed node), on the inwall at bracing frame 20 and stainless steel casing 12 junction surfaces, fix a cable socket 17, penetrate cable 19 in the pipe of bracing frame 20, and be connected with socket 17 by plug 18, cable socket 17 36 is electrically connected with popping one's head in by probe internal wiring 16, and 36 overhead the height of wherein popping one's head in remain on one meter; The chamber internal fixation one motor bearing 11 of this cylindrical case 12 is installed dc brushless motor 13 on it, fix a motor speed control panel 14 on this motor, and motor shaft 9 pierces in the insulated column 8, and with its wringing fit; Insulated column 8 outer walls are with the vanelets 7 (or appellation " rotating speed and synchronization signal generation apparatus ") of a generation synchronizing signal identical with 2 numbers of rotor, on insulated column 8 terminal outer walls, closely be with a rotor fixed cover 1, rotor is fixed on the rotor fixed cover, the center pit that the rotor fixed cover passes parts mount pad 4 and fixes the stator 3 on it also is equipped with prime amplifier 10 on parts erection support 4; Rotating speed and synchronization signal detection circuit plate 21 are fixed on ground brush 5 and rotor fixed cover rubbing contact on the parts erection support 4 (brush bearing) by circuit board fixing rack 23, make rotor be in earth potential all the time; Be equipped with groove (recessed) type optoelectronic switch 22 on rotating speed and the synchronization signal detection circuit plate 21, make vanelets 7 just in time be in the midline position of the interior recess of groove of optoelectronic switch.
Referring to Fig. 2; described stator 3 is integral by (fan-shaped) shape identical stator A1 and counter electrode B2; counter electrode B (guard electrode; reduce electric field distortion) similar with the shape of stator (electric field induction electrode); and be integral with the mutual obforms cross arrangement of stator, its substrate surface plates a gold medal layer and the center has center pit.
Referring to Fig. 3, the prime amplifier in the constant speed inversion type electric field instrument of the present utility model is a low-noise preamplifier, comprising: I/V transducer 25, follower 26, voltage amplifier 27, Chief Signal Boatswain cable driver 28.Flow into the I/V transducer 25 of low-noise preamplifier by the induced charge of stator (induction electrode) generation, marking current is transformed into signal voltage is input to follower 26, follower be to the I/V transducer of prime and the back one-level voltage amplifier 27 between play buffer action, to reduce influencing each other between I/V transducer and the voltage amplifier, signal is input to signal cable driver 28 again after voltage amplifier amplifies, the effect of this grade provides the enough signal powers of long cable and reduces the influence of cable to pre-amplification circuit.
Referring to Fig. 4, another circuit of constant speed electric field instrument of the present utility model is rotating speed and circuit for generating synchronous signals, and it comprises vanelets 7, optoelectronic switch 22, pulse signal amplifier 29 and follower 30.When vanelets 7 rotations, phototriode in the Shi Errang optoelectronic switch 23 receives the light that sends from light emitting diode, the time and stop phototriode to receive the light of light emitting diode, go round and begin again like this and produce the small-pulse effect string, be input to the pulse that obtains enough amplitudes after pulse amplifier 29 amplifies, the main frame of sending into electric field instrument by cable through one of the electric field signal of follower 30 and low noise pre-amplification circuit carries out signal Processing.
Referring to Fig. 5, constant speed electric field instrument motor 13 rotating speeds control of the present utility model adopts phaselock technique to carry out, promptly the pulse signal that produces a standard frequency by crystal oscillator 31 with in phase comparator 32, carry out bit comparison mutually by rotating speed with the pulse signal of circuit for generating synchronous signals generation, if it is asynchronous, phase differential is just arranged, phase signal is through low-pass filter 33, obtain a direct current level increment or a decrement, its driving voltage that goes to control motor driver 34 correspondingly increases or reduces, thereby impels motor speed to increase or minimizing.When motor speed pulse signal low frequency and phase place were identical with the standard frequency pulse signal that is produced by crystal oscillator fully, phase comparator did not just have error signal to export, and motor driver is with the constant voltage level drive motor.
Claims (6)
1. a constant speed rotation flip-over type electric field instrument probe comprises: shell (12), rotor (2), stator A, counter electrode B (3), parts erection support (4), ground brush (5), vanelets (7), motor bearing (11), motor (13), probe internal wiring (16), cable (19), base (24), probe (36); It is characterized in that: also comprise: rotating speed and synchronization signal detection circuit plate (21); Groove (recessed) type optoelectronic switch (22); Motor speed control circuit (14); Prime amplifier (10), electrical isolation post (8); Brush carriage (6); Described stator A and counter electrode B (3) are integral; Described bracing frame (20) is one to be inversion type L type metal tube, the bottom is fixed on the base (24), the another port is communicated with fixing with the tang suit that an end face has the cylindrical case (12) of tang, on its junction surface inwall, fix a cable socket (17), penetrate cable (19) in the pipe of bracing frame (20), and is connected with socket (17) by plug (18), cable socket (17) is electrically connected with pop one's head in (36) by the internal wiring (16) of popping one's head in; The chamber internal fixation one motor bearing (11) of this cylindrical case (12) is installed dc brushless motor (13) on it, fix a motor speed control circuit (14) on this motor, and motor shaft (9) pierces in the insulated column (8), and with its wringing fit; Be with the vanelets (7) of a generation synchronizing signal identical with rotor (2) sheet number at described insulated column (8) outer wall, on the terminal outer wall of insulated column (8), closely be with a rotor fixed cover (1), rotor is fixed on the rotor fixed cover, the center pit that the rotor fixed cover passes parts mount pad (4) and fixes the stator (3) on it also is equipped with prime amplifier (10) on parts erection support (4); Rotating speed and synchronization signal detection circuit plate (21) are fixed on ground brush (5) and rotor fixed cover rubbing contact on the parts erection support (4) by circuit board fixing rack (23), make rotor be in earth potential all the time; Be equipped with grooved optoelectronic switch (22) on rotating speed and the synchronization signal detection circuit plate (21), vanelets (7) is in the interior midline position of groove of optoelectronic switch.
2. by the described constant speed of claim 1 rotation flip-over type electric field instrument probe, it is characterized in that: described shell (12), overcoat (15) and bracing frame (20) are the stainless steel material making.
3. by the described constant speed rotation of claim 1 flip-over type electric field instrument probe, it is characterized in that: described stator (3) is integral by shape identical stator A and the mutual obforms cross arrangement of counter electrode B, and its substrate surface plates a gold medal layer and the center has center pit.
4. by the described constant speed rotation of claim 1 flip-over type electric field instrument probe, it is characterized in that: described low-noise preamplifier comprises: I/V transducer (25), follower (26), voltage amplifier (27), Chief Signal Boatswain cable driver (28); The I/V transducer (25) of the induced charge input low-noise preamplifier that is produced by stator is transformed into signal voltage with marking current and is input to follower (26), and signal is input to signal cable driver (28) again after voltage amplifier amplifies.
5. by the described constant speed rotation of claim 1 flip-over type electric field instrument probe, it is characterized in that: described rotating speed and circuit for generating synchronous signals comprise: vanelets (7), optoelectronic switch (22), pulse signal amplifier (29) and follower (30); When vanelets (7) rotates, phototriode in the Shi Errang optoelectronic switch (23) receives the light that sends from light emitting diode, the time and stop phototriode to receive the light of light emitting diode, the small-pulse effect string that produces, be input to the pulse that obtains enough amplitudes after pulse amplifier (29) amplifies, the main frame of sending into electric field instrument by cable through one of the electric field signal of follower (30) and low noise pre-amplification circuit carries out signal Processing.
6. by the described constant speed rotation of claim 1 flip-over type electric field instrument probe, it is characterized in that: described motor speed control circuit is produced a standard frequency by crystal oscillator (31) pulse signal with in phase comparator (32), carry out bit comparison mutually with the pulse signal of circuit for generating synchronous signals generation by rotating speed, if it is asynchronous, phase differential is just arranged, phase signal is through low-pass filter (33), obtain a direct current level increment or a decrement, the driving voltage that goes to control motor driver (35) with it makes it correspondingly to increase or reduce, thereby impels motor speed to increase or minimizing; When the frequency of motor speed pulse signal and phase place were identical with the standard frequency pulse signal that is produced by crystal oscillator fully, phase comparator did not have error signal output, and motor driver is with the constant voltage level drive motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03249080 CN2694286Y (en) | 2003-09-26 | 2003-09-26 | Probe used for constant-speed rotating upside-down mounting type electric field instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03249080 CN2694286Y (en) | 2003-09-26 | 2003-09-26 | Probe used for constant-speed rotating upside-down mounting type electric field instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2694286Y true CN2694286Y (en) | 2005-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03249080 Expired - Fee Related CN2694286Y (en) | 2003-09-26 | 2003-09-26 | Probe used for constant-speed rotating upside-down mounting type electric field instrument |
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| Country | Link |
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| CN (1) | CN2694286Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519640A (en) * | 2011-11-21 | 2012-06-27 | 西华师范大学 | Tester and testing method for testing pull and rotating speed of motor of minitype unmanned aerial vehicle |
| CN113671267A (en) * | 2021-10-22 | 2021-11-19 | 中国电力科学研究院有限公司 | Measuring device, measuring system and measuring method for space direct current synthetic field intensity |
-
2003
- 2003-09-26 CN CN 03249080 patent/CN2694286Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519640A (en) * | 2011-11-21 | 2012-06-27 | 西华师范大学 | Tester and testing method for testing pull and rotating speed of motor of minitype unmanned aerial vehicle |
| CN113671267A (en) * | 2021-10-22 | 2021-11-19 | 中国电力科学研究院有限公司 | Measuring device, measuring system and measuring method for space direct current synthetic field intensity |
| CN113671267B (en) * | 2021-10-22 | 2022-03-11 | 中国电力科学研究院有限公司 | Measuring device, measuring system and measuring method for space direct current synthetic field intensity |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050420 Termination date: 20120926 |