Constant speed rotary flip-chip electric field gage suitable for thunderstom electricity and near ground atmosphere electric enviroment detection

Abstract

The invention relates to a constant-speed rotary up-side-down mounted electric field apparatus suitable for monitoring thunderstorm electricity and near-ground electric environment. It includes an inverted L-shaped supporting frame, a cable with plug is inserted into its interior, its bottom end is fixed on the base, another end is communicated with projected opening of the external shell, on its inner side a socker is fixed, and is electrically connected with internal connecting wire of probe, a motor is mounted on the motor support seat, and the motor shaft is inserted into the insulating column on the fixing frame and is tightly fit with it; the exterior of the insulating column is equipped with small blade, and on the external wall of its tail end a rotor fixing cover is covered tightly, the rotor is fixed on the rotor fixing cover, Besides, it also has the components of pre-amplifier, rotaling speed and synchronous signal detection circuit board, electric brush and photoelectric switch, etc. Its detection data is high in stability and releability.

Description

technical field [0001] The invention relates to a constant-speed rotating electric field meter, in particular to a constant-speed rotating flip-chip electric field meter suitable for lightning and static electricity monitoring and early warning, and near-earth atmospheric and electrical environment monitoring. Background technique [0002] At present, there are two common methods for measuring the atmospheric electric field (detecting the weak electric field in deep and high altitudes and the electron drift method): the first method is the potential difference method. That is to measure the potential difference between two points in space. The potential difference method is divided into single probe (using a single potential balancer) and double probe (using two potential balancers) measurement methods. The former is generally used on the ground to measure the ground. The potential difference between a certain point in the sky and the ground. The radioactive potentiometer de...

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Problems solved by technology

As long as the extension rod is long enough to avoid the plasma sheath generated by the aircraft, the electric field in the order of mV / m can be measured. It has the advantage of high sensitivity, but the extension rod technology is complicated

The second type is the induced charge method, that is, to measure the electric field by using the principle of the conductor inducing the charge in the electric field. The micro-rocket electric field meter, the ball-borne double-ball electric field meter, and the KDY-I, II, and III rotary electric field meters developed by us use Both of these methods have the advantages of a large measurement range, which is convenient for theoretical calculation and instrument calibration, but the measurement accuracy and the reliability of the electric field data are greatly affected by the rotation speed, and the long-term stability is also poor.

Such as document 1: Luo Fushan et al. KDY type rotary electric field meter. Electric measurement and instrumentation, 1993, 30 (4): 17-21.; As far as most of the electric field meters mentioned above are upright or inverted, their shortcomings As follows: 1. The driving motor of the electric field meter generally adopts a brushed DC motor, and its rated working time (such as an aviation DC motor) is 500 hours. is not suitable

2. Even if the drive motor adopts a general brushless DC motor and a general motor speed control circuit, there is jitter, background noise, and the speed changes greatly with the power supply voltage, load, and ambient temperature. The change of the drive motor speed not only affects the electric field amplitude measurement, but also affect the polarity of the electric field

At the same time, the shell of this motor is generally made of aluminum, which cannot shield the influence of the magnetic force inside the motor on the sensor, which is not conducive to improving the sensitivity of the instrument.

3. The shell of the instrument is made of aluminum, and the sensing surface of the sensor is generally made of copper or aluminum. If it is only used for general treatment, it will be easily oxidized in areas with severe environmental pollution or salt spray areas (such as coastal areas). Rusty and ugly

4. The waterproof performance is poor, the connecting plug and socket are exposed, and there are assembly screws on the surface facing the rain

5. The height of the measurement point from the ground cannot be kept constant or the distance between the sensor surface and the ground is too close, because the measured value of the electric field is related to the height of the instrument’s placement point from the ground; at the same time, if it is too close to the ground, the splashing water on the ground will also affect instrument measurement

6. The structure is complex, there are many design drawings, and the processing and assembly are troublesome; the small pieces of the sensor and the protective electrode are processed and assembled separately, and it is difficult to maintain the consistency between groups and between stations.

7. Using a single brush, the signal transmission has jitter, and the preamplifier that plays a key role in the detection of the measurement signal is directly installed in the probe, which is easily affected by the measurement environment

8. In order to ensure that the electric field signal and the synchronous signal are in the same phase, it is very troublesome to adjust the phase by mechanical means, and it is not easy to adjust

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