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Questions tagged [radiation]

While rare, this tag should be used for questions pertaining to using electronic devices (passive or active) in an ionizing radiation environment. This could be space, medical facilities or physics labs. Defense or military related questions are probably classified.

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1answer
45 views

Reflection of Electric field in open-circuited transmission line

Consider a parallel-wire or parallel-plate or coaxial transmission line, carrying TEM wave, which we model as E,H,V,I, each having a forward(+) and backward(-) wave. In terms of V,I, we define ...
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2answers
62 views

Photodiode Output measurement

I'm using Hamamatshu s8559 photodiode to convert x-rays into it's respective energy. I'm using a 10 bit ADC converter. The problem I'm facing is I have no relationship between the Photo-current ...
13
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6answers
4k views

Can antennas be viewed as light sources?

Clearly antennas are nothing but a device to radiate the electrical energy through electromagnetic waves. Since visible light is also simply a certain range of frequencies, isn't it more easier to ...
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1answer
103 views

Ability of a 100km power transmission line to radiate 50Hz EM waves?

This is about confusion of relating antenna radiation theory to power lines. Assuming a straight 100km or even longer possible power transmisson line with 50Hz frequency. What can be said about the ...
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1answer
80 views

Are headphones with EMF measurement of 10,000 milligauss harmful to me?

I used a EMF detector app on my phone and measured the EMF output on my wired headphones. It measured around 10,000 milligauss on one part of both ear cups. Since wearing these headphones on my head ...
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1answer
97 views

Can a magnet cause a microwave oven to unsafely radiate energy?

I've already successfully warped the colors on a large old CRT Television by setting unshielded speakers on top of it. If I understand correctly, this was due to the deviation of the electro-magnetic (...
-3
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2answers
502 views

Does an electrical outlet radiate EM waves? [closed]

Please consider all cases even with a tiny values. If plug two separated wires to each terminal of electrical outlet, like shown, will it radiate em waves? ...
3
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2answers
640 views

What is the acceptable margin for radiated emission on an European CE device

One of our prototype (IOT gateway) has completed the emission test (EMC) but we have a margin on two particular frequencies, just wondering what is the acceptable margin for CE device in Europe ? I ...
1
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1answer
100 views

Calculate radiation power of an antenna in respect to a given antenna radiation pattern and a given angle

I work on a program that simulates the wave propagation of high frequency electromagnetic waves (2.4 or 5 GHz Bands) in 3D. I use a ray launching approach, where the emitted rays approximate the ...
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0answers
55 views

Radiation pattern of an antenna. Basic

I am trying to understand antenna parameters. I have found information that radiation pattern has two polarisations ( CP and XP) components each of the basis functions may then be represented as a ...
4
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3answers
295 views

PCB design - signal loops

I've read about loops that a PCB designer should avoid them "mostly about ground loops" but i think I've read also about power. so in this case, is this wrong: ???
3
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5answers
248 views

Short-range radar and LIDAR, how do they work?

I was wondering how does short-range radar and LIDAR work? Considering the speed of light, the receiver sampling rate would need to be extraordinarily high to detect short-range distances(sub 1-2 feet)...
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3answers
128 views

Radiation Effects on Electronics

I'm developing a magnetic field sensing kit for a project. The kit contains sensors (specifically an accelerometer, a gyroscope, and a magnetometer) that will detect and measure magnetic fields, and ...
0
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1answer
82 views

How to build EMF radiation protection [closed]

I've recently started to use my laptop more and more on my lap and I'm worried about exposire to radiation emmited by the laptop. I keep it at a distance of about 10cm but still... I was wondering if ...
1
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1answer
63 views

Slayer Exciter Interfering With Voltage Measuremnet With Multimeter

I've built myself a slayer exciter and I am trying to measure the output voltage. I've created a coil with approximately 10 turns and soldered a bridge rectifier to the ends of the coil so I can ...
10
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2answers
1k views

What is a “half latch” in an FPGA?

In a paper about radiation hard FPGAs I came across this sentence: "Another concern regarding Virtex devices is half latches. Half latches are sometimes used within these devices for internal ...
0
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1answer
1k views

How do I calculate the length of a transmission line?

A quick translation: Generator has \$Z_g = 50\Omega\$ and 12 V. The line is loaded with an unknown RL. We observe we have a maximum of 8 V at 250 MHz and a minimum at 500 MHz. Solution: Asks for the ...
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0answers
442 views

Photodiode OP-AMP circuit for UV light radiation

The project: The aim is to be able to use the photodiode to detect plasma (radiation in the UV light spectrum). The photodiode suggested for this application is the BPX65 and I currently have access ...
2
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2answers
146 views

Slayer Exciter Health Hazards

I recently made a slayer exciter which produces arcs about 1-2 inches long. It also makes any electronic device near it go mad (it froze my iphone 6S when I was recording the arcs). What radiation is ...
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1answer
82 views

electricity substation radiation measurements [closed]

I live next to an electricity substation and want to contact the operator/owner to ask for details about the station itself. What measurements should I ask them for?
1
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1answer
109 views

How to determine power from emitted light using a photodiode?

I have a project that involves detecting blue light (400nm-490nm) from Cherenkov radiation to find the power that is being generated by the reactor. I understand the photodiode will give me a leakage ...
0
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2answers
182 views

Recapturing side and back lobe radiation from a directional antenna

When you look at the radiation pattern for a directional antenna, you see a major lobe where the greatest concentration of radiation is found and side and back lobes that have much less concentrated ...
-1
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2answers
8k views

how much power is radiated by cell towers?

I want to know how much power is radiated by cell towers of GSM (1.8 Ghz), 3G (2.1 Ghz), 4G (2.6 Ghz) ? I want links to references if exist.
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2answers
141 views

Largest spectrum image sensor and processing its entire spectrum image

I was developing a digital system to process raw images stemming from an image sensor but I would like to deal with "universal" (as possible) spectrum image sensors with no filter. I know that for ...
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2answers
440 views

What size of hole do microwaves eventually pass through?

I've been searching high and low across the internet and haven't found an answer for this. I have a microwave I got from a friend who wants me to repair it (he REALLY does not want a new one). It had ...
0
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0answers
85 views

Geiger-Mueller Tube Question

this is a question about GM-tubes. I have read about radioactive stuff and also constructed a few geiger counter kits. But here is my question: The unit "bequerel" defines how many disintegrations ...
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2answers
849 views

Formula for Field Strength

According to this document on page 3, the formula for Field strength is stated as follows: I can't find reference to this formula elsewhere and was wondering if someone can verify this is correct, in ...
1
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1answer
58 views

Simulate in Puma-EM given radiation pattern

Is it possible to simulate the EM field in Puma-EM if the radiation pattern is supplied instead of a 3D model of the antenna? Is there other (free) simulation software that can do this? I need to ...
0
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0answers
178 views

Can Silicon Microchip Operate Under Permanent Magnetic Feilds?

Can silicon microchips operate when exposed to permanent magnetic field? Say a simple ua741 exposed to a stationary permanent magnetic field from a permanent magnet or a computer processor under ...
0
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1answer
130 views

Radiation susceptibility test circuit

I am looking to set up a test jig to test radiation susceptibility. This is to do a small in house test to check if my board is susceptible to radiation. The tests frequencies are the standard test ...
0
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2answers
319 views

What is the most widely accepted EMF exposure limit?

I know that there isn't a specific answer to this and different countries have different guidelines in regard to this. There are a couple cell-phone towers in my vicinity (one of which is some 15-20 ...
1
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1answer
168 views

Why am I getting signs of high RF radiation, while the desktop computer turns off?

The desktop computer doesn't have any Wi-Fi accessories. The keyboard and the mouse are wired. But even when the computer and the LCD monitor are turned off (while the power plugs are still connected)...
4
votes
1answer
271 views

Skew planar wheel antenna - is it circularly polarised or not?

'Skew planar wheel' antennas are popular for uhf. They are often described as circularly polarised, but I don't see how they would be. Are they instead just a mixed polarisation omnidirectional ...
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0answers
172 views

Antenna radiation pattern data convert values

This is some radiation pattern data, which seems to be a common format. From my understanding the values in the dB column appear to be normalized gain. I would like to import some pattern data like ...
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2answers
102 views

strange results from transmitter radiation calculation

This table was taken from:http://www.emfwise.com/distance.php At that site a formula: Power Density = P/4Πr2 was used in order to calculate the power density(mW/m2) according to the distance from ...
12
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2answers
3k views

Are chicken bits left in space-qualified ICs?

A chicken bit "is a bit on a chip that can be used by the designer to disable one of the features of the chip if it proves faulty or negatively impacts performance." Would space-qualified logic ...
3
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2answers
191 views

Could a customs x-ray corrupt sram data?

Could a customs x-ray corrupt sram data? Programming RTC on one side of the world, then transporting to the other side has worked fine in the past. The majority of a recent batch all had corrupted ...
0
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2answers
291 views

Is electric power equal to its radiant flux? [closed]

I just want to ask, is electric power equal to radiant flux? In calculating intensity, it is the total light power emitted (radiant flux) divided by the surface unit area.
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3answers
244 views

Is electric field of capacitive sensing circuit harmful and is it radiation?

I have constructed a circuit for capacitive sensing. The code charges and discharges a conductive plate. This uses an Arduino which is connected to a computer via USB. I have decided to measure the ...
0
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1answer
69 views

antenna polarization trajectory

I work on simulation of kind of antenna. How can one interpret this antenna polarization trajectory? the vertical axis label is 'X'. If I want to plot polarization like the above figure, what are ...
2
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1answer
979 views

Magnetron, and Microwave

I took apart a Kenmore microwave, in order to salvage the magnetron, transformer, and the HV capacitor. The transformers, HV Capacitor, and the magnetron from the microwave are intact. Is it possible ...
2
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2answers
2k views

SAVR. Is it even possible to reduce environmental EM radiation without using Faraday cage?

Recently I saw a product called SAVR Radiation Reducer in the market by PowerLink claiming the followings: SAVR Radiation Reducer basically scans and detects EMR waves and it generates reverse ...
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3answers
65 views

Is it possible to induce RF Emissions from a RF enabled Device

Would it be possible to take a device anything such as a wireless router or a wireless video and induce unintentional RF emissions while no power is supplied to the device ? Can you send it some range ...
2
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1answer
283 views

Noise can be Differential or Common!

I have a basic understanding on this topic but i still have some doubts, my text books says Differential means it will have impact on one of the 2 signal nodes. and Common will have a common impact on ...
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2answers
1k views

Design Considerations for Electronics in Space [closed]

What additional constraints do we face when designing electronics/microsystems for use in orbit? What kinds of shielding techniques are employed? Is it common to enclose all electronics in a faraday ...
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4answers
2k views

How do I find out if this mobile tower is bad for my health?

I don't know if this would be on-topic here, but please feel free to migrate this question if that's not the case. I have this mobile tower very close to my house. This photo was taken from my top-...
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4answers
3k views

What makes E-bomb or Electromagnetic pulse (EMP) destructive?

wikipedia says that Electromagnetic pulse As with any electromagnetic signal, EMP energy may be transferred in any of four forms: Electric field Magnetic field Electromagnetic radiation Electrical ...
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1answer
96 views

Correct Notation of Radiation Pattern of an Antenna

I have a confusion regarding the notation of radiation pattern of an antenna array. Some literatures use, say, $$F(r,\theta,\phi)$$ to denote the same while others use $$F(\theta,\phi)$$I would ...
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1answer
86 views

Are there any performance effects of using radiation hardened memory units?

Are there any performance related effects of using radiation hardened memory units as compared to non-hardened ones having the same configuration except the protection it should provide from radiation ...
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2answers
537 views

What module to look for if I want to tell if there's Wi-Fi in the air? [closed]

I'm working on a mobile device. Essentially it has nothing to do with WiFi communication. It doesn't transmit any data over the air. It has to know however if it's in- or outside of the range of a ...