Questions tagged [x-rays]
The x-rays tag has no summary.
24 questions
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BGA ball collapse visible in X-ray — could this be caused by electrical overstress (24 V input pads)?
I’m analyzing a BGA failure on a board and I'm trying to determine whether the damaged solder balls seen in X-ray come from thermal fatigue or from a more sudden electrical overstress (EOS) / ...
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1
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1
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X-Ray inspection criteria
We are seeing board problems when testing a new batch of boards at high temperatures (70°C). This is using leaded solder (and OEM leaded BGA balls) and the component is rated to 100°C.
We believe one ...
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25
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3
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Why don't X-ray machines at airports cause single event effect damage in electronics?
I have a few questions related to the topic. I am confused about a few aspects after reading up about these effects and photoelectricity.
The title basically.
From the photoelectric effect, I would ...
0
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0
answers
99
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High voltage vanishes when increasing AC current on an X-ray supply
I have an old high voltage X-ray power supply enclosed in a pit of insulation oil that is difficult to operate on. The supply includes both a high voltage transformer with dual star connected ...
1
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1
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1k
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X-ray power input and power output Confusion
I was looking at the power calculations of the X-ray machines and found something a bit unusual. As we know the input power must be equal to the output power. Considering an x-ray machine giving an ...
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1
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1
answer
421
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X-ray filament and cathode connection
I was studying how X-ray machines works. I have seen that the filament creates a current that produces electrons. By applying a high voltage between the cathode and anode, the electrons move towards ...
- 719
0
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1
answer
191
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PWM generation for the transformer using SG3524N
I was looking at one of the schematics of the filament board of an x-ray machine, where they had used the SG3524N for the generation of PWM and MOSFETs for the generation of an alternating voltage for ...
- 719
1
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1
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2k
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Zero Voltage switching
I am having confusion regarding the understanding of Zero Voltage switching as given in the website.
What does the ZVS do in the circuit shown below? Does it produce a sine wave or it just makes the ...
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0
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1
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135
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Resonance inverters and pulsation frequency
I was reading one of the patents for the x-ray generator when I found a resonance inverter attached in front of the switching circuit. I understood how the system works but one statement written is ...
- 719
0
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1
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122
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Thermionic emission
I am doing the calculation for the "finding the temperature of filament".
I tried with:
Resistance (R=V/I)
Resistivity (ρ = R·L/A)
Temperature (T = (ρ-ρ0/ρ0-δ) + T0)
Here ρ0, δ and T0 are ...
7
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2
answers
3k
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Do neon signs emit x-rays?
I'm interested about whether or not a conventional neon sign such as this one could emit x-ray that could be harmful.
The sign that you can see in the picture is just below my office window so I'm ...
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1
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378
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How can i measure a transformer primary inductance with a load on the secondary?
I have an x-ray closed transformer and I only can access to the primary terminals. I want to measure the inductance of the primary and to know how this loaded secondary influences it.
1
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0
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178
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Would it be possible to power an X-Ray tube using a Marx generator?
To the best of my knowledge most X-Ray tubes are powered by a smaller voltage running through a large transformer to step it up into the magnitude of 10-100 KV. This larger voltage is then pulsed ...
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0
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1
answer
91
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Photodiode Direction Sensitivity
I'm trying to create a setup where I would have xrays emitted through a photodiode (the non sensitive side). I do not want the photodiode to detect these xrays going through it, only the xrays which ...
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0
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2
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186
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What technique (ultrasound/infrared) should I use to detect seeds inside a fruit? [duplicate]
This fruit is simplistic as there is a thin skin surrounding it. Inside it is a tiny ball of liquid and that is where the dense seed forms. The is seed much more denser in comparison with the liquid ...
- 3