CN210534239U - Electromagnetic radiation detection device - Google Patents
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- CN210534239U CN210534239U CN201920347681.7U CN201920347681U CN210534239U CN 210534239 U CN210534239 U CN 210534239U CN 201920347681 U CN201920347681 U CN 201920347681U CN 210534239 U CN210534239 U CN 210534239U
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Abstract
The utility model discloses a can be used to carry out electromagnetic radiation detection device that electromagnetic radiation detected to electric automobile in use, include: the magnetic field sensor is used for measuring the magnetic field intensity of the space and outputting a magnetic field measurement signal; the electric field sensor is used for measuring the electric field intensity of a space and outputting an electric field measurement signal; the detection circuit is respectively connected with the magnetic field sensor and the electric field sensor and is used for obtaining an electromagnetic radiation detection result of the space according to the magnetic field measurement signal and the electric field measurement signal; wireless transmitting circuit, with detection circuitry connects, is used for with the electromagnetic radiation testing result sends away through wireless mode, because the utility model discloses use the mode of wireless upload data, can carry out electromagnetic radiation's detection to using electronic passenger car at present.
Description
Technical Field
The utility model relates to an electric motor car detection area especially relates to an electromagnetic radiation detection device that can be used to carry out electromagnetic radiation to using electric automobile to detect.
Background
Compared with the traditional fuel oil power automobile, the electric automobile uses the high-voltage battery pack as an energy storage source and uses the three-phase asynchronous motor or the permanent magnet synchronous motor as a power source, so that an electronic circuit from the energy storage source to the power source is a high-voltage (350-1000V) high-current (1-100A) alternating circuit, and the load of the alternating circuit can be greatly changed in a short time in the driving process of the electric automobile, so that electromagnetic field radiation is influenced (according to the inherent characteristics of the circuit, the electromagnetic field radiation frequency range is 1 Hz-100 KHz). Secondly, when the shielded cable in the entire alternating circuit is subjected to excessive mechanical, weather and moisture, the most affected shielded part is the joint, and the performance will typically drop by an order of magnitude (20dB) after 5 years of use. When the high-voltage battery pack in the alternating circuit is close to the end of the service life, the internal resistance of the battery cell is increased, the output impedance of the battery pack is increased, and the working current is increased during normal running. These factors greatly increase the electromagnetic field radiation in the vehicle, and are likely to affect the public health of the electric passenger vehicle.
The influence of low-frequency electromagnetic radiation (1 Hz-100 KHz) on human health is described in the "guide rule for limiting time-varying electric and magnetic field exposure 2010" set by the International Union on of non-ionizing radiation protection (ICNIRP). China also correspondingly sets an electromagnetic radiation control limit standard GB8702-2014 electromagnetic environment control limit, and the standard has no exemption detection clause for the electromagnetic radiation of the electric passenger car.
However, at present, no method and technology for electromagnetic radiation testing in electric vehicles, which is applicable to motor vehicle inspection and detection mechanisms, exist at home and abroad, and the existing approximate or related measurement methods include:
1) according to the limit value and the measuring method of the electromagnetic field emission intensity of the GB/T18387-2017 electric vehicle, an electric field antenna and a magnetic field antenna are erected outside the vehicle at a certain distance in a shielding room filled with wave-absorbing materials or an open place meeting the GB14023-2011 requirement for measurement, and the measurement target is to know the radio disturbance characteristic of the vehicle, namely whether the external receiver of the vehicle is interfered or not, but not to measure the public electromagnetic radiation exposure value. Meanwhile, the national institution is used for the certification and measurement of new vehicle models in the whole vehicle manufacturing plant on the market, but not in-use vehicle measurement, so the requirement of testing public electromagnetic radiation exposure by a motor vehicle inspection and detection mechanism cannot be met
2) Referring to fig. 1, low-frequency electromagnetic radiation measuring instruments represented by EHP-50 are produced by some domestic and foreign enterprises represented by the german NARDA company, some products are also hand-held, and can be used for testing in small spaces in vehicles mainly aiming at places such as high-voltage transmission lines, transformer substations and the like, but if detection result data and waveform data of the products are uploaded to an upper computer or a supervision platform of a relevant department in real time, wired connection such as optical fibers or USB cables is required. This can bring the potential safety hazard when car annual inspection station in actual use. Because the tested vehicle can run on the chassis dynamometer which is not loaded during actual test, and the driving wheel runs on the roller at the speed of 25-40 kilometers, at this time, if the driving wheel is connected with the low-frequency electromagnetic radiation measuring instrument and external equipment in the carriage through wires, even if only slight force exists on the wires, the dynamic balance during the running of the vehicle can be broken, and further, the vehicle swings left and right to cause safety accidents.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned unable defect that is used for the detection with electronic passenger car of prior art, provide one kind and can be used to carry out the electromagnetic radiation detection device that electromagnetic radiation detected to using electric automobile.
The utility model provides a technical scheme that its technical problem adopted is: an electromagnetic radiation detection apparatus usable for electromagnetic radiation detection of an electric vehicle in use is constructed, comprising:
the magnetic field sensor is used for measuring the magnetic field intensity of the space and outputting a magnetic field measurement signal;
the electric field sensor is used for measuring the electric field intensity of a space and outputting an electric field measurement signal;
the detection circuit is respectively connected with the magnetic field sensor and the electric field sensor and is used for obtaining an electromagnetic radiation detection result of the space according to the magnetic field measurement signal and the electric field measurement signal;
and the wireless transmitting circuit is connected with the detection circuit and used for transmitting the electromagnetic radiation detection result in a wireless mode.
Preferably, the wireless transmitting circuit comprises a low-power wireless data transmission module and a wireless transmitting antenna, the low-power wireless data transmission module is connected with the control circuit, and the wireless transmitting antenna is connected with the low-power wireless data transmission module.
Preferably, the detection device comprises a detection head, a handheld body and a connecting piece for connecting the detection head and the handheld body, the detection head is provided with the magnetic field sensor and the electric field sensor, the handheld body is internally provided with the detection circuit and the wireless transmitting circuit, and a line between the detection circuit and the magnetic field sensor and a line between the electric field sensor are routed through the connecting piece.
Preferably, the wireless transmission circuit is arranged at the end part of the handheld body far away from the probe head.
Preferably, the length of the connecting piece is such that the distance between the detecting head and the wireless transmitting circuit is greater than a preset distance, so as to reduce the interference of the wireless transmitting circuit on the electromagnetic radiation detection.
Preferably, the device is further provided with an OLED display screen arranged on the handheld body and an OLED driving circuit arranged in the handheld body, wherein the OLED driving circuit is connected between the detection circuit and the OLED display screen and used for sending a detection result output by the detection circuit to the OLED display screen for displaying.
Preferably, the magnetic field sensor is a three-axis magnetic field sensor.
Preferably, the number of the magnetic field sensors is three, and the three magnetic field sensors are disposed perpendicular to each other, the number of the electric field sensors is one, and the detection circuit includes:
the signal preprocessing circuit is connected with the three magnetic field sensors and the electric field sensor and is used for respectively carrying out corresponding primary amplification on three magnetic field measurement signals output by the three magnetic field sensors and one electric field measurement signal output by the electric field sensor and then carrying out differential output;
the second-stage differential amplification circuit is connected with the signal preprocessing circuit and is used for respectively carrying out secondary differential amplification on the three magnetic field measurement signals and the one electric field measurement signal output by the signal preprocessing circuit and outputting the two magnetic field measurement signals and the one electric field measurement signal;
the root raised cosine filter circuit is connected with the secondary differential amplifying circuit and is used for respectively carrying out root raised cosine filtering on the three magnetic field measuring signals and the electric field measuring signal output by the secondary differential amplifying circuit and outputting the three magnetic field measuring signals and the electric field measuring signal to the control circuit;
and the control circuit is used for determining an electromagnetic radiation detection result according to the signal output by the root raised cosine filter circuit.
The utility model discloses an electromagnetic radiation detection device has following beneficial effect: this device includes wireless transmitting circuit, can with the electromagnetic radiation result sends away through wireless mode, uses the wireless mode of uploading data, can carry out electromagnetic radiation's detection to using the electronic passenger car.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of an application of a prior art electromagnetic radiation detection apparatus;
fig. 2 is a schematic block circuit diagram of the electromagnetic radiation detection apparatus of the present invention;
FIG. 3 is a schematic view of the structure of the electromagnetic radiation detecting apparatus of the present invention;
FIG. 4 is a schematic view of the electromagnetic radiation detecting apparatus of the present invention;
FIG. 5 is a circuit diagram of a low power wireless data transfer module in an exemplary embodiment;
FIG. 6 is a circuit diagram of an OLED circuit in one particular embodiment;
FIG. 7 is a circuit diagram of a detection circuit in one embodiment;
FIG. 8 is a circuit diagram of the magnetic field measurement signal preprocessing circuit of FIG. 7;
FIG. 9 is a circuit diagram of the electric field measurement signal preprocessing circuit of FIG. 7;
fig. 10 is a circuit diagram of the two-stage differential amplifying circuit in fig. 7;
fig. 11 is a circuit diagram of the root raised cosine filter circuit of fig. 7.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "left", "right" and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named as a second component, and similarly, a second component may also be named as a first component, without departing from the scope of the present invention.
The utility model discloses general thinking is: an electromagnetic radiation detection apparatus usable for electromagnetic radiation detection of an electric vehicle in use is constructed, comprising: the magnetic field sensor is used for measuring the magnetic field intensity of the space and outputting a magnetic field measurement signal; the electric field sensor is used for measuring the electric field intensity of a space and outputting an electric field measurement signal; the detection circuit 1 is respectively connected with the magnetic field sensor and the electric field sensor and is used for obtaining an electromagnetic radiation detection result of the space according to the magnetic field measurement signal and the electric field measurement signal; wireless transmitting circuit 2, with detection circuitry 1 is connected, be used for with the electromagnetic radiation testing result sends away through wireless mode, and this device can carry out electromagnetic radiation's detection to using electronic passenger car owing to use the wireless mode of uploading data.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the specific features in the embodiments and examples of the present invention are detailed descriptions of the technical solutions of the present application, but not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present invention can be combined with each other without conflict.
Referring to fig. 2, the utility model discloses an electromagnetic radiation detection device can be used to carry out electromagnetic radiation to using electric automobile and detect, and it includes: a magnetic field sensor, an electric field sensor, a detection circuit 1, and a wireless transmission circuit 2.
The magnetic field sensor is used for measuring the magnetic field intensity of the space and outputting a magnetic field measurement signal, and the magnetic field sensor can be a three-axis magnetic field sensor. The electric field sensor is used for measuring the electric field intensity of a space and outputting an electric field measuring signal. The detection circuit 1 is respectively connected with the magnetic field sensor and the electric field sensor and is used for obtaining the electromagnetic radiation detection result of the space according to the magnetic field measurement signal and the electric field measurement signal. And the wireless transmitting circuit 2 is connected with the detection circuit 1 and is used for transmitting the electromagnetic radiation detection result in a wireless mode.
It is understood that the wireless transmitting circuit 2 may communicate by using, but not limited to, a short-distance wireless communication method such as WiFi, bluetooth, ZigBee, WiMAX, wireless USB, etc., and may also communicate by using a long-distance wireless communication method such as 2.4G, LoRa, etc.
The detection circuit 1 may be implemented by referring to a detection circuit in an existing handheld electromagnetic radiation detection device connected by a wire, or may be optimally designed, and a design scheme of the optimized detection circuit 1 will be provided later in this document. The detection circuit 1 can calculate to obtain the electromagnetic radiation detection result, and the content about the calculation of this part can refer to the realization of current measurement scheme, and this does not belong to the utility model discloses an improvement part, therefore do not expand the explanation here again. The utility model discloses after obtaining the electromagnetic radiation testing result, can directly send result data to wireless transmitting circuit 2, wireless transmitting circuit 2 can encode it and export.
Referring to fig. 3-4, the detecting device of the present invention is divided into three parts in terms of mechanical structure, which are a detecting head 101, a handheld body 103 and a connecting member 102 connecting the detecting head 101 and the handheld body 103 in sequence. The detecting head 101 is provided with the magnetic field sensor and the electric field sensor, the detection circuit 1 and the wireless transmitting circuit 2 are arranged in the handheld body 103, and lines between the detection circuit 1 and the magnetic field sensor and between the electric field sensor are routed through the connecting piece 102.
In order to avoid as much as possible interference of the detection of electromagnetic radiation by the radio transmission circuit 2, it is preferable to optimize it from any one or several of the following aspects;
1) in one aspect, referring to fig. 3 to 4, the wireless transmitting circuit 2 includes a low power consumption wireless data transmission module 21 and a wireless transmitting antenna 22, the low power consumption wireless data transmission module 21 is connected to the detecting circuit 1, and the wireless transmitting antenna 22 is connected to the low power consumption wireless data transmission module 21.
For example, referring to fig. 5, the low power wireless data transmission module 21 may select the APC320, which has a Si4463 chip with low power consumption therein, and may set its transmission power to about 10 mW. The pin 1 of the APC320 is grounded, the pin 2 is connected to a required power supply, the pin 2 is also grounded via the capacitors C86 and C87, respectively, the pins 3 to 7 are connected to the MCU in the detection circuit 11, and the APC320 automatically encodes and outputs data output by the MCU through the pins RXD and TXD.
2) In the second aspect, the transmission frequency of the wireless transmission circuit 2 may be preset, so that the frequency is staggered from the measurement frequency band of the apparatus, for example, the measurement frequency band is 0 to 100KHz, the wireless transmission frequency of the APC320 may be SET to be greater than 433Mhz, specifically, the setting is performed through the SET _ A, SET _ B pin, and how to SET the frequency can refer to the manual of the APC 320.
3) In three respects, the wireless transmission antenna 22 is located as far away from the probe head 101 as possible, for example, the length of the connector 102 is such that the distance d between the probe head 101 and the wireless transmission circuit 2 is greater than a predetermined distance, for example, in this example, 30 cm. In addition, in the present embodiment, the wireless transmitting circuit 2 is preferably disposed at the end of the handheld body 103 far away from the probe 101, so that the overall size of the device is not too large while reducing interference.
Of course, the detection device can send the result to the upper computer for viewing and analysis after detecting the result, and can also directly display the result on the device. Therefore, preferably, the detection device of this embodiment further includes an OLED display screen 4 disposed on the handheld body 103 and an OLED driving circuit 3 disposed in the handheld body 103, where the OLED driving circuit 3 is connected between the detection circuit 1 and the OLED display screen 4, and is configured to send a detection result output by the detection circuit 1 to the OLED display screen 4 for displaying.
Referring to fig. 6, the OLED driving circuit includes a driving chip U22 with model number TPS61040 and a peripheral circuit composed of a capacitor inductor, etc., and the OLED display 4 selected in this embodiment is a 1.54-inch OLED display P9. For a specific display control method, reference may be made to OLED display technology.
It should be noted that the program control methods, such as wireless control and OLED display control, in the present embodiment are all general applications of conventional programs in the field of wireless control and OLED display control, and do not involve improvement of the program itself.
It can be seen that the device of this embodiment can with the electromagnetic radiation result sends away through wireless mode, uses the mode of wireless upload data, can carry out electromagnetic radiation's detection to using the electronic passenger car.
In the embodiment, three common magnetic field sensors and one electric field sensor are included, and the three magnetic field sensors can be arranged perpendicular to each other, so that the magnetic field intensity in each axial direction in the space xyz coordinate system can be detected. It should be noted, of course, that this is only a preferred embodiment of the present invention, and the present invention may also adopt other numbers of magnetic field sensors, which belongs to a simple variation of this embodiment. Similarly, the number of the electric field sensors can also be expanded to be multiple to improve the electric field measurement accuracy, which also belongs to the simple modification of the embodiment.
It was mentioned above that the detection circuit 1 can be implemented with reference to the detection circuit in an existing wired handheld electromagnetic radiation detection device, and can also be optimally designed, and an optimal design scheme is given below. Referring to fig. 7, in a preferred embodiment, the detection circuit 1 preferably includes: signal preprocessing circuit 11, second grade difference amplifier circuit 12, root raised cosine filter circuit 13, control circuit 14, wherein:
the signal preprocessing circuit 11 is connected with the three magnetic field sensors and the electric field sensor, and is configured to perform corresponding primary amplification on three magnetic field measurement signals output by the three magnetic field sensors and one electric field measurement signal output by the electric field sensor, and then perform differential output;
the second-stage differential amplification circuit 12 is connected to the signal preprocessing circuit 11, and is configured to perform secondary differential amplification on the three magnetic field measurement signals and the one electric field measurement signal output by the signal preprocessing circuit 11 respectively and output the two magnetic field measurement signals;
and the root raised cosine filter circuit 13 is connected to the second-stage differential amplification circuit 12, and is configured to perform root raised cosine filtering on the three magnetic field measurement signals and the one electric field measurement signal output by the second-stage differential amplification circuit 12, respectively, and output the signals to the control circuit 14.
The control circuit 14 may determine the detection result of the magnetic field strength and the electric field strength according to the three magnetic field measurement signals and the one electric field measurement signal output by the root-raised cosine filter circuit 13. The control circuit 14 typically comprises an MCU, such as STMF407VET6, as used in this embodiment. The four-way signal of root-raised cosine filter circuit 13 output can finally be exported MCU's built-in multichannel AD and carry out the AD conversion, then MCU can obtain the electromagnetic radiation testing result according to the data operation after the AD conversion, and this part is about the realization that the current measurement scheme can be referred to AD conversion and content of operation, and this does not belong to the utility model discloses an improvement part, therefore do not extend the explanation here again.
More specifically, the signal preprocessing circuit 11 includes:
the magnetic field measurement signal preprocessing circuit 111 is connected with the three magnetic field sensors and is used for respectively carrying out primary differential amplification on three magnetic field measurement signals output by the three magnetic field sensors;
and the electric field measurement signal preprocessing circuit 112 is connected with the electric field sensor and is used for performing single-ended amplification on one path of electric field measurement signal output by the electric field sensor and then performing differential amplification.
Referring to fig. 8, in the present embodiment, the magnetic field measurement signal preprocessing circuit 111 includes three differential input and differential output first operational amplifiers U3, U4, and U5, and a peripheral circuit including a capacitor C10 and a resistor R12, where the three first operational amplifiers U3, U4, and U5 correspond to three magnetic field sensors one to one. In fig. 2, P4 is a connector for connecting three magnetic field sensors, and pins 1 and 2 are in a group and connected with two ends of one magnetic field sensor, and the other pins are the same. In this embodiment, the first operational amplifiers U3, U4, and U5 all use the chip LTC1992-1, and as shown in the figure, two differential input terminals (pins 1 and 8) of each of the first operational amplifiers U3, U4, and U5 are connected to two ends of a corresponding magnetic field sensor, and are configured to receive a magnetic field measurement signal, perform differential amplification on the magnetic field measurement signal, and output the magnetic field measurement signal.
Referring to fig. 9, the electric field measurement signal preprocessing circuit 112 includes two single-ended input and single-ended output second operational amplifiers U1A and U1B, a resistor R7, a capacitor C1, and the like, and also includes a differential input and differential output third operational amplifier U2A, and a resistor R1, R2, R3, and the like. In this embodiment, the two second operational amplifiers U1A and U1B both use LTC6241, input ends of the two second operational amplifiers U1A and U1B (pin 3 of U1A and pin 5 of U1B) are respectively connected to two ends of the electric field sensor, and U1A and U1B perform 1:1 amplification on the electric field measurement signal, mainly to improve the driving capability of the signal. In this embodiment, LT1807 is selected as the third operational amplifier U2A, output terminals of two second operational amplifiers U1A and U1B are respectively connected to two differential input terminals of the third operational amplifier U2A, and resistance values of the resistors R1, R2 and R3 determine the amplification factor.
Referring to fig. 10, with reference to fig. 8 and 9, the terminal P5 in fig. 4 is connected to the terminal P1 in fig. 3, the terminal P6 is connected to the terminal P3 in fig. 2, the two-stage differential amplifier circuit 12 includes two dual-path voltage-controlled differential amplifiers U9 and U15 and a peripheral circuit formed by a resistor capacitor and the like, and in this embodiment, both U9 and U15 are AD 8332. Two pairs of differential input ends of the U15 are connected with differential output ends of the operational amplifier U4 and the U5, two pairs of differential input ends of the U9 are respectively connected with a differential output end of the operational amplifier U3 and an output end of the operational amplifier U2A, only 27 pins of the U9 are connected with the output end of the U2A because only one output end of the U2A is provided, and 28 pins of the U9 are grounded through the capacitor C30. Pins 10 of U9 and U15 are connected with the MCU, and can receive voltage signals output by the MCU, so that gains of U9 and U15 are controlled by the output voltage of the built-in DAC of the MCU.
Referring to fig. 11, the root-raised cosine filter circuit 13 includes four root-raised cosine filter chips U8, U12, U14, U17 and a chip peripheral circuit, the four root-raised cosine filter chips U8, U12, U14 and U17 are respectively connected to P100, P200, P300 and P400 in fig. 4 in a one-to-one correspondence manner, and the P100, P200, P300 and P400 are four outputs corresponding to three magnetic field measurement signals and one electric field measurement signal. The four pairs of differential output ends of U9 and U15 in fig. 4 are respectively connected with the four pairs of input ends of U8, U12, U14 and U17, and the four pairs of output ends of U8, U12, U14 and U17 are connected with the MCU. The input of the inverters U10A-U10D IS a PWM signal from the MCU, the frequency of the PWM signal determines the filter bandwidth of U8, U12, U14 and U17, and the chips U7, U11, U13 and U16 are LT1800IS5 for improving the signal driving capability.
To summarize, the operation principle of the optimized detection circuit 1 is as follows: three magnetic field sensors and one electric field sensor are subjected to signal enhancement and interference prevention through a preprocessing circuit 1, wherein signals of the magnetic field sensors are subjected to differential pre-amplification through U3, U4 and U5, a signal pre-amplification circuit of the electric field sensor respectively performs single-end amplification through U1A and U1B operational amplifier chips, then simultaneously inputs U2A for differential amplification, the signals amplified by U3, U4, U5 and U2A are subjected to secondary amplification through two double-path voltage-controlled differential amplifiers U9 and U15, gains of U9 and U15 are controlled by output voltage of a DAC built in the MCU, four paths of analog signals output by the two double-path voltage-controlled differential amplifiers U9 and U15 are filtered through four 128KHz root raised cosine filter chips U8, U12, U14 and U17, then are output to the built-in multi-channel AD of the MCU for conversion, and a final detection result is obtained through operation.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (8)
1. An electromagnetic radiation detection device for detecting electromagnetic radiation in an electric vehicle, comprising:
the magnetic field sensor is used for measuring the magnetic field intensity of the space and outputting a magnetic field measurement signal;
the electric field sensor is used for measuring the electric field intensity of a space and outputting an electric field measurement signal;
the detection circuit is respectively connected with the magnetic field sensor and the electric field sensor and is used for obtaining an electromagnetic radiation detection result of the space according to the magnetic field measurement signal and the electric field measurement signal;
and the wireless transmitting circuit is connected with the detection circuit and used for transmitting the electromagnetic radiation detection result in a wireless mode.
2. The apparatus according to claim 1, wherein the wireless transmission circuit comprises a low power consumption wireless data transmission module and a wireless transmission antenna, the low power consumption wireless data transmission module is connected to the detection circuit, and the wireless transmission antenna is connected to the low power consumption wireless data transmission module.
3. The electromagnetic radiation detecting apparatus of claim 1, wherein the detecting apparatus includes a detecting head, a handheld body, and a connecting member connecting the detecting head and the handheld body, the detecting head is provided with the magnetic field sensor and the electric field sensor, the detecting circuit and the wireless transmitting circuit are provided in the handheld body, and a line between the detecting circuit and the magnetic field sensor and the electric field sensor is routed via the connecting member.
4. The apparatus according to claim 3, wherein the wireless transmission circuit is disposed at an end of the hand-held body distal from the probe head.
5. The apparatus according to claim 3, wherein the connector has a length such that a distance between the probe and the wireless transmitting circuit is greater than a predetermined distance to reduce interference of the wireless transmitting circuit with electromagnetic radiation detection.
6. The apparatus according to claim 3, further comprising an OLED display screen disposed on the handheld body and an OLED driving circuit disposed in the handheld body, wherein the OLED driving circuit is connected between the detecting circuit and the OLED display screen, and is configured to send a detection result output by the detecting circuit to the OLED display screen for displaying.
7. The electromagnetic radiation detection apparatus of claim 1, wherein the magnetic field sensor is a three-axis magnetic field sensor.
8. The electromagnetic radiation detection device of claim 1, wherein the number of the magnetic field sensors is three, and the three magnetic field sensors are disposed perpendicular to each other, and the number of the electric field sensors is one, the detection circuit comprising:
the signal preprocessing circuit is connected with the three magnetic field sensors and the electric field sensor and is used for respectively carrying out corresponding primary amplification on three magnetic field measurement signals output by the three magnetic field sensors and one electric field measurement signal output by the electric field sensor and then carrying out differential output;
the second-stage differential amplification circuit is connected with the signal preprocessing circuit and is used for respectively carrying out secondary differential amplification on the three magnetic field measurement signals and the one electric field measurement signal output by the signal preprocessing circuit and outputting the two magnetic field measurement signals and the one electric field measurement signal;
the root raised cosine filter circuit is connected with the secondary differential amplifying circuit and is used for respectively carrying out root raised cosine filtering on the three magnetic field measuring signals and the electric field measuring signal output by the secondary differential amplifying circuit and outputting the three magnetic field measuring signals and the electric field measuring signal to the control circuit;
and the control circuit is used for determining an electromagnetic radiation detection result according to the signal output by the root raised cosine filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920347681.7U CN210534239U (en) | 2019-03-19 | 2019-03-19 | Electromagnetic radiation detection device |
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|---|---|---|---|
| CN201920347681.7U CN210534239U (en) | 2019-03-19 | 2019-03-19 | Electromagnetic radiation detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638474A (en) * | 2020-06-29 | 2020-09-08 | 北京森馥科技股份有限公司 | Vehicle electromagnetic exposure measurement method and device and computer equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638474A (en) * | 2020-06-29 | 2020-09-08 | 北京森馥科技股份有限公司 | Vehicle electromagnetic exposure measurement method and device and computer equipment |
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