CN106900051B - Method and device for reducing specific absorption rate of electromagnetic radiation - Google Patents
Method and device for reducing specific absorption rate of electromagnetic radiation Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3833—Hand-held transceivers
- H04B1/3838—Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
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Abstract
The invention discloses a method and a device for reducing specific absorption rate of electromagnetic radiation, which are characterized by comprising the following steps: a processor of the mobile terminal acquires a detection result of a temperature sensor of the mobile terminal, wherein a difference value between every two continuous K detection values in the detection result of the temperature sensor of the mobile terminal is greater than a first set threshold value, and K is a positive integer greater than 1; the processor calculates the specific absorption rate SAR of electromagnetic radiation and the equipment grade index value DSI according to the detection result of the temperature sensor; and when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power so as to provide a new method for reducing the specific absorption rate of electromagnetic radiation, so that the electromagnetic injury of the mobile terminal to a human body is reduced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for reducing specific absorption rate of electromagnetic radiation.
Background
With the increasingly widespread application of mobile terminals, the radiation of the mobile terminal to the human body is considered more and more by the public, and particularly, virtual reality equipment is usually worn on the head of a user, and the user is particularly concerned about the radiation problem of the virtual reality equipment. The index for measuring the energy of the electromagnetic wave radiated to the human body is SAR (Specific Absorption Rate), i.e., the electromagnetic wave energy Absorption ratio of the wireless terminal. SAR is generally used as a degree value indicating a harmful influence of electromagnetic waves radiated from a mobile terminal on a human body.
At present, most of the technologies for reducing the SAR adopt measures such as changing antenna wiring, increasing CAP SENSOR (CAP SENSOR), differentiating grounding and the like. However, these measures are difficult to implement, especially in relation to the design of the antenna, and are difficult and inefficient.
Disclosure of Invention
The embodiment of the invention provides a method and a device for reducing the specific absorption rate of electromagnetic radiation, which are used for providing a new method for reducing the specific absorption rate of the electromagnetic radiation, so that the electromagnetic damage of a mobile terminal to a human body is reduced.
The inventive method comprises a method for reducing the specific absorption rate of electromagnetic radiation, which method comprises:
a processor of the mobile terminal acquires a detection result of a temperature sensor of the mobile terminal, wherein a difference value between every two continuous K detection values in the detection result of the temperature sensor of the mobile terminal is greater than a first set threshold value, and K is a positive integer greater than 1;
the processor calculates the specific absorption rate SAR of electromagnetic radiation and the equipment grade index value DSI according to the detection result of the temperature sensor;
and when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
Based on the same inventive concept, the embodiment of the present invention further provides an apparatus for reducing specific absorption rate of electromagnetic radiation, the apparatus comprising:
the device comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring the detection result of a temperature sensor of the mobile terminal, and K continuous detection values in the detection result of the temperature sensor of the mobile terminal are all larger than a first set threshold;
the calculation unit is used for calculating and obtaining an electromagnetic radiation specific absorption rate SAR and an equipment grade index value DSI according to the detection result of the temperature sensor;
and the processing unit is used for indicating a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power when the SAR is judged to be larger than the preset transmitting power value corresponding to the DSI.
The method and the device for measuring the SAR of the mobile terminal have the advantages that the temperature sensor is used for measuring the SAR, the transmitting power value is adjusted by using the measuring result, the temperature sensor mainly plays a role under the condition that the mobile terminal is in contact with a user, so that the problem that the distance sensor cannot measure the field intensity and further cannot calculate the SAR when the user wears the mobile terminal like a virtual reality helmet and the like can be solved, in addition, the transmitting power value can be correspondingly adjusted after the SAR is accurately measured, the electromagnetic radiation meets the index, and the electromagnetic injury to a human body is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a model applied to an SAR measurement system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for reducing specific absorption rate of electromagnetic radiation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a framework of a principle for reducing specific absorption rate of electromagnetic radiation according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for reducing specific absorption rate of electromagnetic radiation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Because various organs of the human body are all lossy media, an induction electromagnetic field is generated in the human body under the action of an external electromagnetic field, and the induction electromagnetic field in the human body can generate current, so that electromagnetic energy is absorbed and dissipated. SAR is commonly used in biological dosimetry to characterize this physical process. SAR means the electromagnetic power absorbed or consumed by a unit mass of human tissue, in W/kg. The differential value over time of the energy elements (dW) absorbed (dissipated) by the mass elements (dm) within a volume element (dV) of a given density (ρ) is the SAR. Namely, it is
The problem of electromagnetic radiation of mobile terminals such as mobile phones has been a concern of the public. Among them, the european and north american regions have made mandatory requirements for the development of relevant tests as early as 90 years in the last century. There are two international limit standards, and the european limit standard is: the SAR average value of 10g of biological tissues is 2.0W/kg; the defining criteria in north america are: SAR of 1g of biological tissue was 1.6W/kg on average.
The information industry department of our country decides to formally develop the mobile phone electromagnetic radiation network access detection from 2005. The detection requirement is as follows: detecting electromagnetic radiation (SAR) values which simultaneously give a 1g average and a 10g average; the exposure limits were: the average Specific Absorption Rate (SAR) value of any 10 grams of biological tissues and any continuous 6min cannot exceed 2.0W/kg. Wherein, in all the inspection items, the maximum peak value space average SAR value (10g volume average) is given as the total detection result, and the value is less than 2.0W/kg and is judged to be qualified; otherwise, judging the product as unqualified.
The department of the information industry of our country and the requirements should be expressed in bold type in the product specification: the maximum value of the electromagnetic radiation Specific Absorption Rate (SAR) of the product is X.X W/kg, which meets the requirements of national standard GB 21288-2007, and the maximum value of the electromagnetic radiation Specific Absorption Rate (SAR) is encouraged to be marked on the outer package of the product. The product specification indicates the matters of the cardiac pacemaker, the hearing aid, the ear vortex implantation and the like which need to be noticed by the user when the product is used
The SAR measurement system mainly comprises a human body model, an electronic measurement instrument, a scanning and positioning system, a tested equipment clamp and the like. The measurement should be performed by measuring the electric field distribution inside the model by means of an automatically positioned mini field strength probe. According to the measured field intensity value, the distribution of SAR and the peak value space average SAR can be calculated. As shown in FIG. 1, a standard model shape was developed based on the study report on the head of 90% adult male in human studies, and the model ear simulates the flat state of the ear when a human hand-held device is used. Point M is the mouth reference point, LE is the left Ear Reference Point (ERP), RE is the right Ear Reference Point (ERP). These must be marked on the outer surface of the model to facilitate repeated positioning of the wireless device according to the model. The laboratory performing the measurements should meet the following environmental conditions:
-ambient temperature is between 18 ℃ and 25 ℃, the liquid temperature change during the measurement cannot exceed ± 2 ℃;
ambient electromagnetic noise cannot exceed 0.012W/kg (3% of the lower detection limit 0.4W/kg);
-the wireless communication device under test is not connectable to a local public communication network;
the influence of reflections, auxiliary radio transmitters, etc. should be less than 3% of the measured SAR value.
Based on the system for measuring SAR, an embodiment of the present invention provides a flow diagram of a method for reducing specific absorption rate of electromagnetic radiation, and as shown in fig. 2, the method specifically includes:
step S101, a processor of the mobile terminal obtains a detection result of a temperature sensor of the mobile terminal, wherein a difference value between every two continuous K detection values in the detection result of the temperature sensor of the mobile terminal is larger than a first set threshold value, and K is a positive integer larger than 1.
And step S102, the processor calculates the specific absorption rate SAR of the electromagnetic radiation and the equipment grade index value DSI according to the detection result of the temperature sensor.
Step S103, when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
The method provided by the embodiment of the invention is mainly aimed at a mobile terminal similar to virtual reality equipment, for example, when a user wears a virtual reality helmet, the relative position of a distance sensor and the user is kept unchanged, so that the measured distance is not changed any more, the field intensity distribution of the user cannot be measured, and the electromagnetic radiation cannot be calculated. Therefore, the embodiment of the invention carries out detection in two scenes, and when the mobile terminal does not contact with a user, the SAR detection is carried out by using the distance sensor; when the mobile terminal is in contact with a human body, SAR detection is performed by using a temperature sensor.
In addition, no matter which sensor is used for detection, a table about the mapping relationship between the DSI and the transmission power is generated in advance before detection, and different DSI levels correspond to different transmission power values respectively, as shown in the following table.
Table one:
| DSI | transmission power value |
| 1 | 22 |
| 2 | 20 |
| 3 | 18 |
| 4 | 16 |
| … | … |
In addition, the mapping relation in the first table can be updated subsequently, the power control parameters pre-stored in the modem are pre-stored according to different scenes, and the database can be updated in real time through the interface function.
The mapping relation table can be pre-stored in the modem or in the processor, if the mapping relation table is stored in the modem, the mapping relation table between the DSI and the transmitting power can be called from the modem when the processor judges, and the SAR and the preset transmitting power value corresponding to the DSI are compared. If the SAR signal is stored in the processor, the processor searches a preset transmitting power value corresponding to the DSI from a prestored mapping relation table of the DSI and the transmitting power, compares the SAR with the preset transmitting power value corresponding to the DSI, and sends a comparison result and the preset transmitting power value to the modem.
Further, before acquiring the detection result of the temperature sensor, the processor may determine whether the detection value of the distance sensor is stable within a set time period by the following method, and if it is determined to be in a stable state, it may be determined that the detection value is invalid. Specifically, when the processor of the mobile terminal determines that the difference between every two of the N consecutive detection values of the distance sensor is smaller than a second set threshold, the processor sends a stop instruction to the distance sensor, acquires the detection result of the temperature sensor within a set time period, and determines whether the temperature values within the time period are all larger than a certain set value, if so, it indicates that the user is in contact with the temperature sensor, the effective temperature detection value acquired by the temperature sensor is obtained, and the relative position between the user and the distance sensor is kept unchanged, so the distance detection value acquired by the distance sensor is invalid.
That is, in the initial state, the temperature sensor and the distance sensor are both in the working state, then the processor obtains the detection results of the two sensors and analyzes the obtained detection values, and when the processor finds that the values measured by the distance sensor are hardly changed before and after a certain period of time, the values measured by the distance sensor can be determined to be unchanged, so that the distance sensor can be turned off, at this time, only the temperature sensor is in the working state, and the SAR is calculated by using the temperature values measured by the temperature sensor. As shown in fig. 3, a distance sensor and a temperature sensor detect the intensity of electromagnetic radiation mainly by means of the temperature change of the object to be measured, and the distance sensor detects the field intensity distribution of the device to be measured mainly by means of distance induction. The processor obtains the detection results of the two sensors, obtains the effective detection value of the sensor according to the comparison result, then converts the temperature value or the distance value into DSI, judges the state information DSI of the mobile terminal through MI (Modem message), and further transmits the message MI to the modem. The modem adjusts the transmitting power according to the comparison result of the processor. As can be seen from this process, when the detection value of one of the sensors is invalid, turning off the distance sensor or the temperature sensor may reduce power consumption of the mobile terminal.
Further, the method for calculating the SAR by using the temperature value measured by the temperature sensor is that the processor calculates the SAR according to a first formula according to the detection result of the temperature sensor, wherein the first formula is as follows:
where c is the specific heat capacity of the human tissue, T is the detection result of the temperature sensor, and T is the detection time period.
In addition, after the SAR is obtained according to the calculation, the processor also judges that if the SAR is smaller than the preset transmitting power value corresponding to the DSI, the processor does not send a transmitting power adjusting instruction to the modem.
Considering that the temperature sensor cannot detect the temperature of the user when the mobile terminal is not in contact with the user, the embodiment of the present invention further provides a detection method in such a scenario, specifically, when the processor of the mobile terminal determines that a difference between two consecutive N detection values of the temperature sensor in a second set time period is not greater than the first set threshold, the processor sends a stop instruction to the temperature sensor, and obtains a detection result of the distance sensor in the second set time period, where a difference between two consecutive N detection values in the detection result of the distance sensor of the mobile terminal is not less than the second set threshold; the processor calculates the SAR and the DSI according to the detection result of the distance sensor;
and when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
Similar to the detection method of the temperature sensor, the SAR is mainly calculated by using the detection result of the distance sensor in the scene, and the calculation method is mainly characterized in that a processor calculates the electric field intensity of a user of the mobile terminal according to the detection result of the distance sensor; the processor calculates the SAR according to a formula two according to the electric field intensity, wherein the formula two is as follows:
where σ is the conductivity, ρ is the density, and E is the electric field strength.
In this scenario, the method for adjusting the transmission power of the subsequent modem is consistent with the above method, and is not described herein again.
In summary, the method for reducing specific absorption rate of electromagnetic radiation adopted by the embodiment of the present invention is different from the conventional method, the embodiment of the present invention adopts two sensors, the distance sensor is adopted to detect the electric field intensity when the mobile terminal is not in contact with the human body, and once the mobile terminal is in contact with the human body, the electromagnetic radiation intensity is evaluated through the temperature change of a certain part of the human body in a specific time.
Based on the same technical concept, the embodiment of the invention also provides a device for reducing the specific absorption rate of electromagnetic radiation, and the device can execute the method embodiment. As shown in fig. 4, the apparatus provided in the embodiment of the present invention includes: an acquisition unit 301, a calculation unit 302, a processing unit 303, wherein:
an obtaining unit 301, configured to obtain a detection result of a temperature sensor of a mobile terminal within a first set time period, where a difference between every two consecutive K detection values in the detection result of the temperature sensor of the mobile terminal is greater than a first set threshold, and K is a positive integer greater than 1;
a calculating unit 302, configured to calculate, according to a detection result of the temperature sensor, an electromagnetic radiation specific absorption rate SAR and an equipment level index value DSI;
and the processing unit 303 is configured to instruct a modem of the mobile terminal to adjust the transmission power to a preset transmission power when it is determined that the SAR is greater than a preset transmission power value corresponding to the DSI.
Further, the calculating unit 302 is specifically configured to: and calculating according to a detection result of the temperature sensor and a formula I to obtain the SAR, wherein the formula I is described above and is not repeated.
Further, the apparatus further comprises: a determination unit 304 for determining a difference between two of consecutive N detection values of the distance sensor;
if the determining unit 304 determines that the difference is smaller than a second set threshold, the sending unit 305 is further configured to send a stop instruction to the distance sensor;
further, the determining unit 304 is further configured to: and determining whether the continuous K detection values of the temperature sensor in a second set time period are larger than the first set threshold value. When the determination unit 304 determines that the result is no, the sending unit 305 sends a stop instruction to the temperature sensor;
the obtaining unit 301 is further configured to obtain a detection result of the distance sensor within the second set time period, where a difference between every two consecutive N detection values in the detection result of the distance sensor of the mobile terminal is not less than the second set threshold;
further, the calculating unit 302 is further configured to: calculating to obtain the SAR and the DSI according to the detection result of the distance sensor;
the processing unit 303 is further configured to: and when the SAR is judged to be larger than the preset transmitting power value corresponding to the DSI, indicating a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
Further, the calculating unit 302 is specifically configured to: calculating the electric field intensity of a user of the mobile terminal according to the detection result of the distance sensor; and calculating according to the electric field intensity and a formula II to obtain the SAR, wherein the formula II is not described any more as described above.
In summary, in the embodiments of the present invention, a temperature sensor and a distance sensor are used in combination to perform SAR measurement, and a measurement result is used to adjust an emission power value, where the temperature sensor mainly functions when a mobile terminal contacts a user, and the distance sensor functions when a distance between the mobile terminal and the user changes, so that a problem that the distance sensor cannot measure a field strength and cannot calculate the SAR when the user wears a mobile terminal such as a virtual reality helmet can be avoided.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method of reducing the specific absorption rate of electromagnetic radiation, the method comprising:
a processor of the mobile terminal determines the difference value between every two of N continuous detection values of the distance sensor, wherein N is a positive integer greater than 1;
if the difference value is smaller than a second set threshold value, the processor of the mobile terminal sends a work stopping instruction to the distance sensor;
the method comprises the steps that a processor of the mobile terminal obtains a detection result of a temperature sensor of the mobile terminal in a first set time period, wherein the difference value between every two continuous K detection values in the detection result of the temperature sensor of the mobile terminal is larger than a first set threshold value, and K is a positive integer larger than 1;
the processor calculates the specific absorption rate SAR of electromagnetic radiation and the equipment grade index value DSI according to the detection result of the temperature sensor;
and when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
2. The method of claim 1, wherein the processor calculates a specific absorption rate SAR of the electromagnetic radiation according to the detection result of the temperature sensor, and comprises the following steps:
the processor calculates the SAR according to a first formula according to the detection result of the temperature sensor, wherein the first formula is as follows:
where c is the specific heat capacity of the human tissue, T is the detection result of the temperature sensor, and T is the detection time period.
3. The method of claim 1, wherein after the processor instructs a modem of the mobile terminal to adjust the transmit power to the preset transmit power, further comprising:
when the processor of the mobile terminal determines that continuous K detection values of the temperature sensor in a second set time period are not larger than the first set threshold value, a work stopping instruction is sent to the temperature sensor;
the processor of the mobile terminal acquires the detection result of the distance sensor in the second set time period, wherein the difference value between every two continuous N detection values in the detection result of the distance sensor of the mobile terminal is not smaller than the second set threshold value;
the processor calculates the SAR and the DSI according to the detection result of the distance sensor;
and when the processor judges that the SAR is larger than a preset transmitting power value corresponding to the DSI, the processor instructs a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power.
4. The method of claim 3, wherein the processor calculates the SAR based on the detection of the distance sensor, comprising:
the processor calculates the electric field intensity of a user of the mobile terminal according to the detection result of the distance sensor;
the processor calculates the SAR according to a formula two according to the electric field intensity, wherein the formula two is as follows:
where σ is the conductivity, ρ is the density, and E is the electric field strength.
5. An apparatus for reducing the specific absorption rate of electromagnetic radiation, the apparatus comprising:
the device comprises a determining unit, a judging unit and a judging unit, wherein the determining unit is used for determining the difference value between every two of continuous N detection values of the distance sensor, and N is a positive integer larger than 1; if the determining unit determines that the difference is smaller than a second set threshold, a sending unit is used for sending a work stopping instruction to the distance sensor;
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring a detection result of a temperature sensor of the mobile terminal in a first set time period, the difference value between every two continuous K detection values in the detection result of the temperature sensor of the mobile terminal is greater than a first set threshold value, K is a positive integer greater than 1, and K is a positive integer greater than 1;
the calculation unit is used for calculating and obtaining an electromagnetic radiation specific absorption rate SAR and an equipment grade index value DSI according to the detection result of the temperature sensor;
and the processing unit is used for indicating a modem of the mobile terminal to adjust the transmitting power to the preset transmitting power when the SAR is judged to be larger than the preset transmitting power value corresponding to the DSI.
6. The apparatus as recited in claim 5, said computing unit to:
according to the detection result of the temperature sensor, the SAR is obtained through calculation according to a first formula, wherein the first formula is as follows:
where c is the specific heat capacity of the human tissue, T is the detection result of the temperature sensor, and T is the detection time period.
7. The apparatus of claim 5, wherein the determination unit is further to: determining whether K continuous detection values of the temperature sensor in a second set time period are larger than the first set threshold value;
when the determination result of the determination unit is negative, the sending unit sends a work stopping instruction to the temperature sensor;
the obtaining unit is further configured to obtain a detection result of the distance sensor within the second set time period, where a difference between every two consecutive N detection values in the detection result of the distance sensor of the mobile terminal is not less than the second set threshold;
the calculation unit is further configured to calculate the SAR and the DSI according to a detection result of the distance sensor;
and the processing unit is further configured to instruct a modem of the mobile terminal to adjust the transmission power to a preset transmission power when it is determined that the SAR is greater than a preset transmission power value corresponding to the DSI.
8. The apparatus as recited in claim 7, said computing unit to: calculating the electric field intensity of a user of the mobile terminal according to the detection result of the distance sensor;
and calculating according to the electric field intensity and a formula II to obtain the SAR, wherein the formula II is as follows:
where σ is the conductivity, ρ is the density, and E is the electric field strength.
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| CN107612573A (en) * | 2017-09-25 | 2018-01-19 | 深圳市盛路物联通讯技术有限公司 | The SAR value method of adjustment and wearable device of a kind of wearable device |
| CN109001505B (en) * | 2018-04-10 | 2019-12-24 | 西安易朴通讯技术有限公司 | Method for carrying out temperature compensation on SAR sensor of terminal and terminal |
| EP3758346A4 (en) | 2018-04-20 | 2021-03-17 | Huawei Technologies Co., Ltd. | Method and device for reducing electromagnetic radiation specific absorption rate |
| CN113993199B (en) * | 2020-07-27 | 2024-05-14 | 北京小米移动软件有限公司 | Antenna radiation power adjusting method and device and electronic equipment |
| CN111948460A (en) * | 2020-08-13 | 2020-11-17 | 歌尔光学科技有限公司 | Head-mounted display device, electromagnetic radiation warning method and device and readable storage medium |
| US11716695B2 (en) * | 2020-09-11 | 2023-08-01 | Qualcomm Incorporated | Exception-robust time-averaged radio frequency exposure compliance continuity |
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