[PSUBS-MAILIST] passive sonar

[T Novak via Personal_Submersibles]

Brian,

What are you trying to do with the "passive sonar" that you are considering? Are you wanting to make your submarine more easily detectable by a surface boat with a depth sounder?

Tim

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Brian Cox via Personal_Submersibles
Sent: Friday, May 17, 2019 8:35 PM
To: PSubs <personal_submersibles at psubs.org>
Subject: [PSUBS-MAILIST] passive sonar

 

        I've been thinking about some sort of pinger locator for my sub.  I may get a commercially available one just as an extra safety measure, but in the mean time I was playing around with my depth finder on my sailboat .  I was thinking if I had a rotating disk that would be a little higher than the sub the changing surface exposure to the sonar waves would appear on the depth finder as a recurring blip .  I tried it with a radar reflector that I have, I tied it to a line and located it just below my transducer, I was able to move it around and observe the display on the screen.   Since the radar reflector ( used on boats so big ships can see you) has all these sides to it, as I moved it around it would show up intermittently since the sound wave sometimes would not bounce back.  I think a flat surface rotated so only the edge is showing and then a large surface was showing at a regular intervals could work as an indicator.   I might be especially valuable if you were blending into the bottom so much as to not be detectable .  That way someone with just an ordinary depth finder could detect you.  

 

Brian    

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