You will need
- conventional radio, flat screwdriver, hand analyzer electromagnetic field.
Improvised "catcher" electromagnetic radiation is a conventional radio receiver, preferably something of the cheapest models. They react to electromagnetic interference. To the antenna of such a receiver fasten a loop of wire or wire (with a radius of not less than 20 centimetres), rebuild the radio to a frequency where no broadcast and walk around the house, listen to how to change the sound. Where distortion is most clearly audible, there is electromagnetic radiation is stronger.
You can try to make the process of locating strong magnetic fields more visible. Go to a major electronics store and ask them flat screwdriver. There are two types of screwdrivers, take one which has an led and three small batteries. Usually they burn red. House hold a screwdriver to any enabled device, swipe along the wires (even if they are mounted in the wall) – the more intense the light from the screwdriver, the stronger the electromagnetic radiation.
So how to measure electromagnetic radiation in the numbers of improvised means impossible, then used a special device. If your friends work for companies on labour protection, certification or service of the state, you can try to ask them for a special device, which will show you the magnetic field. It is called a manual analyzer electromagnetic field. The device is able to measure the level of electromagnetic radiation the most common frequencies. Switch on the appliance and put in the tracking mode the desired frequency. So how to keep track of all the readings simultaneously, set the mode of recording the measurement results, then view them on the computer. Units of radiation measurement are also set independently from the usual "volts per meter" to "microwatt per centimetre square".
Remember that electromagnetic radiation is harmful to the human body and should be avoided.
Using any of the above ways, you'll find the most "dangerous" places in your apartment.
Advice 2 : How to measure electromagnetic field
Measurement of the electromagnetic field are carried out in two directions. First, find its frequency using the Hertz dipole or resonant circuit. To do this, tune them in resonance with an external electromagnetic field and calculate their own frequency. The second is its intensity. For rough measurements of the intensity of use an inductor (solenoid). For a more accurate – special devices.
You will need
- vibrator Hertz
- - resonant circuit with the possibility of changing the settings,
- - copper wire,
- - iron core,
- - a set of devices for measuring magnetic and electric fields.
The determination of the frequency of the electromagnetic field Take the Hertz dipole. This is a copper rod, with balls at the ends, in the gap which is inserted a Ruhmkorff coil (two windings on one core). If you make it to the electromagnetic field, adjust the clearance of the rod, yet it does not begin to slip sparks. With reference to these parameters, find the frequency of this vibrator, it will be the frequency of the external electromagnetic field.
In the second case, take a resonant circuit with a coil of small inductance and a capacitor of large capacitance. Included in this resonant circuit the ammeter, and (by changing its parameters, for example, increasing or decreasing capacity) measure, at what values it is the most current. It will be observed from the coincidence of the natural frequency of the loop oscillation frequency of the electromagnetic field. This technique is used in radios, and therefore you can take the path with them. Devices measure the inductance of the coil and the capacitance of the capacitor in which there is resonance, then from the product of inductance and capacitance extract the square root and then multiply the result by the number of 6.28. The number 1 divide by the result of calculations. The result will be the frequency of the external electromagnetic field in Hertz.
Determination of the intensity of the electromagnetic field If it is known that at a given point of space is the electromagnetic field, take a copper wire of large cross-section with a length of about 1 m, wrap it into a solenoid (a few isolated threads) and the leads (the ends of the conductor), connect the voltmeter. An alternating magnetic field, which is a component of an electromagnetic field, excite in the conductor EMF, measure it with a voltmeter. The more indications of the voltmeter, the more intense the field. Special gauges of the magnetic field can define its intensity in different frequency bands. Make a sensor device in the field on the screen will appear the options.
Advice 3 : How to measure square meter
In some countries, the area of apartments and homes consider hundreds of square meters, and the area of plots in hectares. In Russia, occupying 1/6 of the land in acres is generally measured by square plots, and the usual unit of housing area is the square meter. Moreover, to measure every square meter sometimes you need accuracy to the square inch.
You will need
- construction roulette;
- - the electronic rangefinder.
To measure the square footage (area expressed in square meters) of rectangular shape, multiply its length and width. The width and length of the room it is necessary to record in meters. If the number of meters when measuring a non-integer (i.e., there are measurement and centimeters), attribute number Santimeters after the decimal point with a comma). So, for example, measure 1 meter 23 centimeter will match the number 1.23.
If the room tabs or niches from the other rooms, the square footage is calculated separately and subtracted or added to the rectangular area of the room. However, note that the protrusions from plumbing installations (eg. risers) should not be subtracted from the square because they are square – even if it is the device for General use.
To measure the number of square meters in a non-rectangular room, divide it into rectangles and fold the yardage of each of them. Of course, this method is suitable only in the case when all of the additional corners of the room direct.
When measuring the length and width of the room, use a regular construction tape measure or electronic distance meter. To get a more accurate result, take two measurements – different parts of the wall. If the measurements differ, then find the arithmetic average – add up and divide both measurements in half.
When used for measurement of square footage room electronic (laser) roulette pay special attention to the direction of the beam should be exactly perpendicular to the wall. Even a deviation of a few degrees is able to numerate the extra square meter.
If the square footage of the apartments is calculated with the purpose of installation of heating system "warm floor" on the basis of infrared heating film, then subtract from the obtained square meters square stationary furniture (sofas, beds, cabinets, walls and kitchen tables).
If the room has a complex shape, break difficult sections into triangles and sectors. To calculate the square footage of a triangle, measure its sides and use Heron's formula:Treugolnika = √(p * (p-a) * (R-b) * (p-C)), where R - properietor of the triangle, i.e., R=(a+b+C)/2, where a, b and C be the lengths of its sides. To calculate the area of a sector use the formula for the area of a circle (PR Kvadrat), and then multiply the resulting value by the number of degrees in the sector and divide by 360.
Advice 4 : What is the electromagnetic field
The introduction of new technologies and the widespread use of electricity led to the emergence of artificial electromagnetic fields, which often have a damaging effect on humans and the environment. These physical fields are created when there are moving charges.
The nature of the electromagnetic field
The electromagnetic field is a special kind of matter. It occurs around the conductors, which are moving electric charges. Is this force field from two separate fields, electric and magnetic, which can not exist in isolation from one another. The electric field at the origin and change invariably produces a magnetic.
One of the first nature of the variable fields in the mid-nineteenth century began to explore James Maxwell, to whom belongs the merit of the theory of the electromagnetic field. Scientist have shown that moving with the acceleration of electric charges creates an electric field. Change it generates a field of magnetic forces.
The AC magnetic field may be a magnet, if you set it in motion, and electric charge that oscillates or is accelerated. If the charge moves with constant speed, through a conductor carries a steady current, which is characterized by a constant magnetic field. Spreading in space, the electromagnetic field carries energy, which depends on the magnitude of the current in the conductor and frequency of the radiated waves.
The impact of electromagnetic fields on human
The level of all electromagnetic radiation that create the designed person of the technical system are many times greater than the natural radiation of the planet. This field is characterized by a thermal effect that can cause overheating of the tissues of the body and irreversible consequences. For example, prolonged use of a mobile phone, which is the source of radiation, may lead to temperature increases in the brain and lens of the eye.
The electromagnetic field produced by household appliances, can cause the appearance of malignant tumors. This applies in particular to children. Prolonged human presence near a source of electromagnetic waves reduces the efficiency of the immune system leads to diseases of the heart and blood vessels.
Of course, to completely abandon the use of technical means, which are the source of the electromagnetic field, it is impossible. But you can apply the simple preventive measures, for example, use cell phone only with a headset, do not leave cords of the devices in electrical outlets after use of equipment. In everyday life it is recommended to use extension cords and cables with protective shielding.
Advice 5 : Is it harmful wi-fi radiation
Modern technology has spread so widely that the human body is almost unable to escape from the electromagnetic radiation that produces cell towers, TV transmitters, household appliances, and Wi-Fi access points installed all around. So how harmful is radiation from Wi-Fi and how can it be minimized?
Radiation from Wi-Fi does have some irritant effect on the Central nervous system and the brain. It manifests itself in fatigue, irritability, headaches and insomnia that occur as the result of inflated electromagnetic background. The radiation frequency of the Wi-Fi router is 2.4 GHz, which is approximately equal to the frequency of microwave ovens, however, still less several thousand times.
Accurate evidence about the dangers of routers Wi-Fi has not yet been received – however, as evidence of their absolute safety. If a person is worried about their impact on your body, it can at least limit your contact with your laptop or smartphone and follow a number of recommendations, which are given by specialists in electromagnetic waves - this will help to minimize their effects on the body.
If the Internet is not used when a person is at home, a Wi-Fi router, unplug it from power. Sleep on it-enabled access point is strongly not recommended – however, as work at a very close distance from her. Street Wi-Fi are usually placed in public places, so the source of electromagnetic radiation is far away from the man, making its impact minimal. However, to hide from the radiation still will not work, because the modern metropolis is literally riddled with a network of electromagnetic waves.
If Wi-Fi works on your phone, it should either be included as needed or not to keep constantly beside him – and especially not to sleep with the source, placing the phone on the adjacent pillow. A stationary router Wi-Fi it is desirable to place in the middle of the apartment, trying to choose a location maximally distant from the places of permanent residence of the people living in the apartment. Since all models are Wi-Fi routers allow you to adjust the radiated power, it is not necessary to put the most powerful level to obtain a quality signal – if it is quite normal, should be satisfied with his average.
In addition to Wi-Fi, electromagnetic rays constantly emit mobile phones, computers, televisions, electric shavers, Hairdryers and so on.
The greatest amount of electromagnetic radiation Wi-Fi router emits in the time of Internet connection.