Newbie Passive RFID question...

Thread Starter

acesandeights

Joined Nov 13, 2019
2
I have a question regarding passive RFID devices, in the context of weapons design....could a passive RFID chip be mounted to a magazine follower (in layman's terms, a magazine follower is a device in a firearm's magazine which pushes the cartridges into the chamber of the firearm, usually constructed of stamped steel or other alloy and installed above the magazine spring) and be used by a RFID reader located in the weapon to identify what type of magazine had just been inserted (a 20, 30, 40 round magazine, etc.) plus how many rounds were actually in the magazine by somehow measuring the distance from the RFID chip to the RFID reader. That data could be relayed to a heads-up or ocular display. For example, a soldier with an empty weapon, no magazine inserted, finds a partially full magazine and inserts it into his own empty weapon. The RFID reader reads the passive RFID chip and designates this magazine as a 40-round magazine, but by measuring distance from the reader to the chip, determines that there are only 13 rounds remaining in this particular magazine. This data could be relayed to a display as "13/40" or something easily understood. How complex and large would such a system have to be?
 

geoffers

Joined Oct 25, 2010
308
I think the main problem you would run into is that passive RFID, especially the low frequency type (I don't have much experience with HF mind) really don't like a lot of conductive material around them.

The field soon gets 'absorbed', in animal I'd I've seen a metal eartag next to a RFID tag make the RFID unreadable.

Cheers Geoff
 

geoffers

Joined Oct 25, 2010
308
I'm all for electronics and sensors etc, but think this is one situation where the right solution has been found?
A 20 round mag is twice as long as a 10 and the slot down the side means you can see or feel roughly how many rounds are left?
 
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