Jump to content
hiflier

Low End Gear And Research Equipment

Recommended Posts

hiflier
BFF Donor

Motion lights from what I have read are not IR emitters but are more like a thermal imager which passively detects changes in temperature. The motion sensor passively monitors the heat in it angle of detection and when a warm body enters the field it detects the temperature change and turns on the light. This isn't like a supermarket door opener which sends out microwaves radar-style and then quickly calibrates the time it takes for the microwaves to bounce back to its receiver.

 

And sure, I'll get something up from the NV scope sometime soon. It is advised in the manual to always view with both eyes open to reduce losses in our natural night vision. But even so the screen when looked at through the eyepiece was very bright. I cut a small circle from the leader of exposed negative film and installed it between the rubber eye cup and the lens. It results in a kind of orange cast but the level of brightness is much lower now and unless I have the IR illumination on the highest setting my natural night vision when I look take the scope away is very much better. It also doesn't affect what is actually recorded on the display which at night is in b & w. The unit is cool because it can be used with no light whatsoever unlike the NV feature which does need some light like any other NV scope does.

Share this post


Link to post
Share on other sites
Catmandoo
BFF Donor
15 hours ago, gigantor said:

 

Why do you need to ground yourself?

 

Humans and other animals with a nervous system have an electric field and a magnetic field. Had an EKG? Lots of electrical pulses moving along our nervous system. We actually create a human body magnetic field that shows up in ELF bands.

The human body at rest is putting out about 100 Watts of power.  A shark will know the presence of a human at a very long range.  Evolution of electric eels is shocking. Seems like that we live on a giant battery. Air is ionically charged. When an object moves, air is energized,  + & -- ions. The human body should be neutral when grounded. That changes when we walk. I have a Trifield Natural EM Meter, made by AlphaLab, Inc. It can be used as a proximity sensor. I can walk by it and set it off ( audible alarm). The manufacturer claims that under the correct conditions, movement of a person can be detected through a wall.  So we have humans and critters roaming around spewing magnetic and electric fields. Some people want to hide their EMF signature. Shielding and grounding is commonly dealt with rigid materials and fabrics. Magnetic shields do not need grounding. Electric fields need a ground. Low cost grounding is via a wrist strap and foot wear ground straps.

If you want to experiment, keep in mind that carbon fiber is not the best shielding. Tin coated copper mesh fabric is available.  Lowest cost is aluminized mylar Emergeny Ponco's and tubular tents. They are called 'space blanket poncho', 'Emergency Poncho', 'Survival Poncho'. The 'tubular' tents are about 8' long. Hook a ground wire to them.

 

I posted about the ELF band.  I read a paper by a European researcher who may have been in the military. His research was detecting the human magnetic field in the ELF band.  One area of future use was to have a handheld receiver in the ELF band to locate persons who are buried by an avalanche.    How about a detector that picks up animal presence via magnetic field -- ELF band, not requiring audible or inaudible (infrasound) noise? The research is in the area of the Schumann frequencies.  Cheapest available portable detector that I have seen only goes down to 600Hz. Not good enough.

 

Human electromagnetic emission in the ELF band
J. Lipkova, J. Cechak

 

Edited by Catmandoo
add more text
  • Thanks 1
  • Upvote 1

Share this post


Link to post
Share on other sites
Catmandoo
BFF Donor

I tried horse hair/horse blanket  as an olfactory signaling test and drove the black bears crazy. I bought horse hair and a used horse blanket off of ebay and craigslist. The items get washed but there was some scent remaining. I bundled up horse hair and horse blanket fibers with loops of string for hanging. Placed the collection in a plastic bag lined coffee can and filled with water. Into the freezer.  I can't remember how high off of the ground that I suspended it. A bear could not stand on it's hind legs and get it.

Time release essence of horse. The drip rate was greater during the day, slowed down at night. The black bears went nuts. This was a heavy item to pack uphill to a camera site. I did this one time.  

horse hair ice block_2.jpg

Share this post


Link to post
Share on other sites
hiflier
BFF Donor

Just ran across this, different name, same product as Barska NV100 for about $30 less money and with free shipping:

https://www.amazon.com/Solomark-Monocular-Blue-Infrared-Illuminator-Viewing/dp/B00THZ2NFE/ref=as_li_ss_tl?tag=shopperz_origin3-20&ascsubtag=841369700-2-&SubscriptionId=AKIAJO7E5OLQ67NVPFZA

 

It operates at the less desirable 850nm wavelength and some illumination can be seen by most cameras. As Catmandoo stated in another thread the 94 nm is better as its illuminator is virtually invisible to cameras. Animals? I sure they see at least the 850 nm glow.

Edited by hiflier

Share this post


Link to post
Share on other sites
Catmandoo
BFF Donor
6 hours ago, hiflier said:

As Catmandoo stated in another thread the 94 nm is better as its illuminator is virtually invisible to cameras.

 

940nm is invisible to humans.  Some light sources have very bad out of bandwidth transmission. Humans see the faint red glow from lights labeled as '850nm'.   I purchased a light labeled as '940nm'. Initially, it looked good.  However the longer that I had it turned on, the light started showing in the 'red' spectrum.  Have you ever tried to return something to China?   These things always have to be tested to determine what they really are.

Share this post


Link to post
Share on other sites
Madison5716

Best purchases this winter were my Minus33 merino wool long underwear (FAVE) and my Morakniv knives! 

Share this post


Link to post
Share on other sites

×