CN105572482A - Enclosed space electric field measurement device - Google Patents

Abstract

The invention discloses an electric field measuring device in a confined space, which comprises a single chip controller for signal analysis, a signal preamplifier, a communication interface, a debugging interface, a data forwarding power amplifier, a radio frequency filter, a power supply circuit and a color liquid crystal display. The preamplifier includes an inductance sensor and a dual op-amp circuit, and the signal analysis single-chip controller is respectively connected to a communication interface, a debugging interface, a data forwarding power amplifier, a color liquid crystal display and a dual op-amp circuit, and the dual op-amp circuit is also connected to an inductance sensor. The electric field measurement device for a confined space of the present invention can perform waveform recording and time domain and frequency domain analysis on electromagnetic waves in a confined space, and then perform cable fault location determination and analysis in a confined space. The invention of the electric field measurement device for a confined space of the present invention will provide The judgment and location of faults in the cable trench have an accuracy and real-time performance that cannot be compared with other technical means.

Description

A device for measuring electric field in a confined space

technical field

The invention relates to a measuring device, in particular to an electric field measuring device in a closed space.

Background technique

At present, the electromagnetic wave energy field detection technology does not have the ability to accurately locate and identify in a confined space. It can only detect the strength of the electromagnetic wave energy field, and cannot perform electromagnetic wave waveform recording and time domain and frequency domain analysis. The characteristics of the confined space can be used to determine and analyze relevant faults; the electric field measuring device in a confined space of the present invention can perform waveform recording and time domain and frequency domain analysis of electromagnetic waves in a confined space, and then perform cable fault location determination and analysis in a confined space. The closed space of the present invention The invention of the space electric field measuring equipment will have an unmatched accuracy and real-time performance in the judgment and location of faults in the cable trench.

Contents of the invention

The object of the present invention is to provide an electric field measuring device in a confined space to solve the problems raised in the background art above.

To achieve the above object, the present invention provides the following technical solutions:

An electric field measurement device in a confined space, comprising a signal analysis single-chip controller, a signal preamplifier, a communication interface, a debugging interface, a data forwarding power amplifier, a radio frequency filter, a power supply circuit and a color liquid crystal display, and the signal preamplifier includes an inductor sensor and dual operational amplifier circuit, the signal analysis single chip controller is respectively connected to communication interface, debugging interface, data forwarding power amplifier, color liquid crystal display and dual operational amplifier circuit, dual operational amplifier circuit is also connected to inductance sensor, and said data forwarding power amplifier A radio frequency filter is also connected, and the radio frequency filter is also connected to a radio frequency antenna, and the power supply circuit supplies power to the signal preamplifier, signal analysis single-chip controller and data forwarding power amplifier respectively.

As a further solution of the present invention: the power supply circuit adopts a 3.3V integrated voltage regulator.

As a further solution of the present invention: the signal analysis single-chip controller is connected to a color liquid crystal display through a display interface.

Compared with the prior art, the beneficial effect of the present invention is that the electric field measuring equipment in a confined space of the present invention can perform waveform recording and time-domain and frequency-domain analysis of electromagnetic waves in a confined space, and then perform cable fault location judgment in a confined space Analysis, the invention of the electric field measuring equipment in a confined space of the present invention will provide accuracy and real-time performance that other technical means cannot match for the judgment and location of faults in cable channels.

Description of drawings

Figure 1 is a circuit diagram of an electric field measurement device in a confined space.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, in the embodiment of the present invention, a kind of electric field measurement equipment of confined space, comprises signal analysis single-chip controller, signal preamplifier, communication interface, debugging interface, data forwarding power amplifier, radio frequency filter, power supply circuit and color The liquid crystal display, the signal preamplifier includes an inductance sensor and a dual operational amplifier circuit, and the signal analysis single-chip controller is respectively connected to a communication interface, a debugging interface, a data forwarding power amplifier, a color liquid crystal display and a dual operational amplifier circuit, and the dual operational amplifier The circuit is also connected to the inductance sensor, the data forwarding power amplifier is also connected to the radio frequency filter, and the radio frequency filter is also connected to the radio frequency antenna, and the power supply circuit supplies power to the signal preamplifier, the signal analysis single-chip controller and the data forwarding power amplifier respectively; The power supply circuit adopts a 3.3V integrated voltage stabilizer; the signal analysis single-chip controller is connected with a color liquid crystal display through a display interface.

Please refer to Fig. 1, the electric field measurement equipment in a confined space of the present invention is based on the secondary current signal induced by the electromagnetic wave passing through the inductance coil for voltage conversion, amplified collection, waveform recording and time domain and frequency domain analysis by a single-chip microcomputer, and then completes According to the analysis of the electric field in the confined space, the location of the cable fault.

First, the electromagnetic signal amplifies and screens the weak signal of the inductance sensor through the dual op-amp circuit of the signal preamplifier, and outputs the electromagnetic signal of 10Hz to 20MHz to the signal analysis single-chip controller. The circuit consists of two stages of 100 times amplification, and the output signal can reach 3V. The digital-analog acquisition unit of the signal analysis single-chip controller will collect and analyze the signal in real time, and the electromagnetic signal is digitized in the signal analysis single-chip controller. Smoothing and filtering, after packaging, the data is transmitted through the power amplifier and RF filter, and finally transmitted to the RF antenna for analysis by the supporting data analysis system.

Here, after packaging, the digitized signal will provide a data source for the local device through the USB of the communication interface. At the same time, through the signal analysis, the single-chip controller is connected with the color liquid crystal display through the display interface to analyze the electric field in the confined space and display the location information of the cable fault.

The entire system downloads and debugs programs through the debugging interface, which is convenient for equipment upgrades and error corrections.

The power circuit is implemented by a 3.3V integrated voltage regulator, which is responsible for providing stable and reliable high-precision working power for the signal preamplifier, signal analysis single-chip controller and data forwarding power amplifier.

The working principle of the present invention is the electromagnetic wave induction receiving principle. Electromagnetic wave is also a kind of magnetic field. According to Maxwell's electromagnetic field theory, a changing electric field will generate a changing magnetic field in its surrounding space, and a changing magnetic field will generate a changing electric field. In this way, the changing electric field and changing magnetic field depend on each other, excite each other, generate alternately, and spread out in space from near to far at a certain speed.

In the present invention, an inductance sensor is used as an antenna to convert magnetism to electricity, and inductance is a property of a closed loop and a physical quantity. When the coil passes current, a magnetic field induction is formed in the coil, and the induced magnetic field will generate an induced current to resist the current passing through the coil. This current passes through the resistance to obtain a voltage according to the formula of Ohm's law. The voltage is very weak and directly digitized will cause large distortion. Therefore, a dual op amp circuit is used here for voltage amplification, and the dual op amp circuit respectively constitutes a 100 times forward voltage amplifier and a 100 times forward filter amplifier to filter and shape the voltage signal through diodes, so that the sensitivity of the entire system is 0.5 microwatts.

The amplified electromagnetic wave signal enters the signal analysis single-chip controller, and the signal is quantized by the internal 12-bit resolution analog-to-digital converter. The acquisition rate reaches 20MHz. The quantized electromagnetic wave signal is limited by the signal analysis single-chip controller. The average filter algorithm and the Kalman filter algorithm are used for signal processing. The former limited average filter algorithm is used for signal preprocessing to remove interference factors. The latter Kalman filter algorithm is mostly used in military radar systems and missile tracking. In recent years, it has been more used in Computer image processing, such as head and face recognition, image segmentation, image edge detection, etc. The invention uses a Kalman filter algorithm to analyze data, compares the result with a model library, and obtains a fault analysis result.

In the present invention, the electromagnetic wave signal is transmitted to the lower-level system through the means of communication interface, wireless signal and other means through the double op-amp circuit, signal analysis single-chip controller, and filtering algorithm analysis, and is fed back to the operator through the liquid crystal.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (3)

1. A closed space electric field measuring device, comprising a single chip controller for signal analysis, a signal preamplifier, a communication interface, a debugging interface, a data forwarding power amplifier, a radio frequency filter, a power supply circuit and a color liquid crystal display, is characterized in that the The signal preamplifier includes an inductance sensor and a dual operational amplifier circuit. The signal analysis single-chip controller is respectively connected to a communication interface, a debugging interface, a data forwarding power amplifier, a color liquid crystal display and a dual operational amplifier circuit, and the dual operational amplifier circuit is also connected to an inductive sensor. , the data forwarding power amplifier is also connected to a radio frequency filter, and the radio frequency filter is also connected to a radio frequency antenna, and the power supply circuit supplies power to the signal preamplifier, the signal analysis single-chip controller and the data forwarding power amplifier respectively. 2. The electric field measurement device in a confined space according to claim 1, wherein the power supply circuit adopts a 3.3V integrated voltage regulator. 3 . The electric field measurement device in a confined space according to claim 1 , wherein the signal analysis single-chip controller is connected to a color liquid crystal display through a display interface. 4 .