Ghost Hunt

cavedave

Would you go on a ghost hunt? The paranormal forum seem to be organizing one
http://www.boards.ie/vbulletin/showthread.php?t=2055133254

If you would go what experiments would you undertake? And if you would not go why not?

monkeyfudge

Well some of us have been working on building an infra sound detector for the next investigation.

It's thought that infra sound could be responsible for a lot of the phenomena that people would normally associate with a haunting.

stormkeeper

What range is infrasound in compared to ultrasonic?

monkeyfudge

stormkeeper wrote:

What range is infrasound in compared to ultrasonic?

Infrasound is lower than the range of human hearing, while ultrasound is above the range of human hearing... so we're talking about frequencies beneath 17 hertz.

Humans can detect it, but it isn't processed on a conscious level, that's why we are quick to assign supernatural reasons to it.

cavedave

monkeyfudge Well some of us have been working on building an infra sound detector for the next investigation.

That is a really clever idea.
How about capacitance as well? I have a human detector built based on capacitance and it could explain the "I felt like there was a presence" feeling.
How about temperature? A lot of creaking must be due to expnsion/contraction effects?

stormkeeper

monkeyfudge wrote:

Infrasound is lower than the range of human hearing, while ultrasound is above the range of human hearing... so we're talking about frequencies beneath 17 hertz.

Humans can detect it, but it isn't processed on a conscious level, that's why we are quick to assign supernatural reasons to it.

*nods* I was asking because I can hear slightly into ultrasonic ranges, and I've gone over to people and asked them what the noise is, only to find that people can't hear it, so I was trying to determine if it were possible for me to hear into that range, although it seems I may have to wait till there's an actual infrasound thingy to see if I can hear it, though I kinda find it doubtful...

Capt'n Midnight

Humans may be sensitive to electrical / magnetic fields. That sensation you get at the top of your nose. So some stuff for that.

Is there such a thing as a draft detector, that could measure a slow movement of cold air have to be based on hot wire as the cooling effect would be wind chill rather than temperature.

sniffer dogs in case of organics.

how about 3d microphones lots of mics recording at the same time so you can later isolate where any sounds come from. no I've no idea where you get the software to do that.

monkeyfudge

stormkeeper wrote:

*nods* I was asking because I can hear slightly into ultrasonic ranges, and I've gone over to people and asked them what the noise is, only to find that people can't hear it, so I was trying to determine if it were possible for me to hear into that range, although it seems I may have to wait till there's an actual infrasound thingy to see if I can hear it, though I kinda find it doubtful...

Well as you get older your hearing starts to drop. So it would be rare for someone over 30 to be able to hear 20khz... I'm 29 and can only make it as high as about 16.5khz... I can still hear ultrasonic pest controllers though.

We have EMF readers that we bring on investigations too. But there are so many electric signals everywhere these days I find any readings the thing gives off to be unreliable, but you can use it in conjunction with a stud finder to check for electric cabling in the walls.

stormkeeper

monkeyfudge wrote:

Well as you get older your hearing starts to drop. So it would be rare for someone over 30 to be able to hear 20khz... I'm 29 and can only make it as high as about 16.5khz... I can still hear ultrasonic pest controllers though.

I get the feeling I'll still hear those too then..

We have EMF readers that we bring on investigations too. But there are so many electric signals everywhere these days I find any readings the thing gives off to be unreliable, but you can use it in conjunction with a stud finder to check for electric cabling in the walls.

Yeah, I have a CellSensor-type EMF Meter, want to get a better model for use on investigations at some point. Wouldn't mind making my own Negative Ion Detector as well...

littlebug

monkeyfudge wrote:

Well as you get older your hearing starts to drop. So it would be rare for someone over 30 to be able to hear 20khz... I'm 29 and can only make it as high as about 16.5khz... .

Stupid question.. how did you measure that?

monkeyfudge

Well most audio editing packages will allow you to generate a tone at any frequency that you wish. So you just keep going up the scale until you can't hear it anymore.

Audacity is a a free open source piece of audio editing software that can do this. It's a very small download as well.

Just be sure your speakers are capable of reproducing frequencies in that range though.

littlebug

monkeyfudge wrote:

Well most audio editing packages will allow you to generate a tone at any frequency that you wish. So you just keep going up the scale until you can't hear it anymore.

Audacity is a a free open source piece of audio editing software that can do this. It's a very small download as well.

Just be sure your speakers are capable of reproducing frequencies in that range though.

Cool. Thanks.