FDC2214: How to design sensor for anti-collision application

John11513

Part Number: FDC2214
Other Parts Discussed in Thread: FDC1004

Hi Team,

My customer want to design an anti-collision system for Mobile C-ARM X-RAY DSA equipment with our FDC2214 capacitive sensing device. The below is a picture of their target equipment. The tusk of the sensing circuit is to detect any objectives (hand, body, metal or nonmetal) closing to it. For this purpose, they are planning to arrange some copper plate (such as flex PCB) in internal surface of the cube in picture to act as sensor. The target detectable proximation distance is 50mm to 100mm. Do you have any idea about how to design/arrange the sensors for it?

Thank you!

John

over 2 years ago

0 Patrick Simmons over 2 years ago

TI__Mastermind 26335 points

Hello John,

There this application note for the FDC2214 as well as this application note and this TI design for the FDC1004 that might provide some insight into how to design with capacitive based sensing solution.

0 John11513 over 2 years ago in reply to Patrick Simmons

TI__Expert 5720 points

Hi Patrick,

Thank you for reply. Those application notes are helpful.

Do you know if there are any software tools can help design of sensor electrodes? Or just give simulation of electromagnetic field distribution based on provided electrodes?

Thank you!

John

0 Justin Beigel over 2 years ago in reply to John11513

TI__Mastermind 18545 points

Hello John,

We don't have any tools for sensor design, but you can use something like FEMM to simulate the electromagnetic fields of the sensor. There is documentation on the tool on their homepage and we also have an app note discussing how to Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics).

Additionally, if using the FDC2214, it is better at measuring a change in capacitance rather than an absolute, so it is beneficial to base the proximity detection on a delta in the data. Reference sensors can also be used to help reduce any noise in the environment from other factors such as impacts from temperature changes.

Best Regards,
Justin Beigel

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FDC2214: How to design sensor for anti-collision application