Circuit to detect conductive coating.

  • Thread starter Thread starter Nithin Reddy
  • Start date Start date
  • Tags Tags
    Circuit Coating
Click For Summary
SUMMARY

This discussion focuses on building a circuit to detect the presence of Electro Magnetic Interference (EMI) coatings on lenses. The proposed solution involves creating a level controlled oscillator using a resonant capacitor and inductor, along with a supply current meter. As the coil approaches the conductive EMI layer, the induced eddy currents will increase the oscillator current, indicating the presence of the coating. Additionally, it is noted that EMI coatings are effective only when the lens is mounted in a metal wall or tube, and that static electricity can be managed without EMI coatings by using ethylene glycol.

PREREQUISITES
  • Understanding of level controlled oscillators
  • Knowledge of resonant circuits involving capacitors and inductors
  • Familiarity with eddy currents and their effects
  • Basic principles of Electro Magnetic Interference (EMI)
NEXT STEPS
  • Research the design and implementation of level controlled oscillators
  • Explore the principles of resonant circuits and their applications
  • Learn about eddy currents and their role in conductive materials
  • Investigate alternative methods for static electricity reduction on lenses
USEFUL FOR

Electronics engineers, optical engineers, and anyone involved in the design or maintenance of lenses with EMI coatings will benefit from this discussion.

Nithin Reddy
Messages
1
Reaction score
0
Basically to detect whether a lens has EMI coating or not.
 
Engineering news on Phys.org
EMI is Electro Magnetic Interference?
 
Build a level controlled oscillator with a resonant capacitor and inductor. Include a supply current meter. As the coil approaches the conductive EMI layer, the eddy currents induced in the conductive coating will draw power from the resonant circuit and be indicated by an increase in oscillator current.

EM waves will wrap around the outside of the conductive surface, so EMI coatings will only work if the lens is mounted in a metal wall or the end of a metal tube. The advantage of the conductive layer is probably in the reduction of static electricity attracting dust. Static can be eliminated without an EMI coating by using a drop of ethylene glycol, (antifreeze), when you wipe your lenses.
 
Last edited:

Similar threads

To detect 12V using Opamp
  • · Replies 17 ·
Replies
17
Views
2K
Best way to non-conductive coat aluminum?
  • · Replies 9 ·
Replies
9
Views
5K
Undergrad Flow rate calculation of coating application
  • · Replies 30 ·
2
Replies
30
Views
3K
Can We Make PCB Using Paper And Pencil?
  • · Replies 13 ·
Replies
13
Views
2K
EMI Shielding Effectiveness with Various Conductor Thicknesses
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Thermodynamic Pros/Cons coating light metal tanks with rubber
  • · Replies 7 ·
Replies
7
Views
2K
Whether setting up a additional circuit with separate grounding and an
  • · Replies 29 ·
Replies
29
Views
2K
Help me heat up a powder coating oven (made out of an old steel cabinet)
  • · Replies 9 ·
Replies
9
Views
2K
Help me breadboard my circuit
  • · Replies 10 ·
Replies
10
Views
2K
Electroless nickel coating of confined spaces
  • · Replies 1 ·
Replies
1
Views
2K