(more than slightly off topic ) ULTRASONIC bug repellers
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Does anybody know if ultrasonic bug repellers really work. If so,
does anyone know what frequency they operate on?
If they really work I'm gonna build me a great big one.
I hate bugs.
Thank You
Rich
does anyone know what frequency they operate on?
If they really work I'm gonna build me a great big one.
I hate bugs.
Thank You
Rich
Comments
frequency. Not sure about other insects, flying or otherwise.
Rich
--- In basicstamps@y..., burtsz@a... wrote:
> They do not work on mosquitos (have it on very good authority)
regardless of
> frequency. Not sure about other insects, flying or otherwise.
>>does anyone know what frequency they operate on?
>>
>>If they really work I'm gonna build me a great big one.
>>
>>I hate bugs.
>Rich
>--- In basicstamps@y..., burtsz@a... wrote:
> > They do not work on mosquitos (have it on very good authority)
>regardless of
> > frequency. Not sure about other insects, flying or otherwise.
>
>That's what I figured. Thanks.
Hi Rich and all,
I must say I like bugs, but definitely not bugs of the mosquito
persuasion. They do have an amazing sense of hearing that earns them
(maybe!) grudging respect. Their hearing is tuned closer to 300 or
400 hertz, which is the wing beat frequency, not ultrasound. Here is
a nice presentation with pretty pictures:
http://www.unizh.ch/~ormia/research_mosquitoes.html
I think nobody! is going to want to be bombarded with real mosquito
flight sound buzzzzzzzing at >100dbm.
I've been constructing pulsed ultrasound emitters for the state
health dept, where a scientist is using them in the wild to _attract_
rabid bats and skunks to traps. Apparently the rabid animals find the
noise highly annoying and come in for the attack. Normal animals
avoid them.
I do not mean to imply that ultrasound will attract only the most
vicious and bloodthirsty mosquitos to your vicinity! All I have
heard is that after 10 or 15 good scientific studies, there is no
discernable effect of ultrasound on mosquito orientation behavior.
People still flock to buy those repellers, why?, maybe because of the
quasi-plausible mystique of the invisible, safe, shield.
-- regards,
Tracy Allen
electronically monitored ecosystems
mailto:tracy@e...
http://www.emesystems.com
at the same frequency as their wings vibrate and at a strong enough
amplitude, they can not fly. Problems with current models are wrong
frequency and not strong enough!! There's my opinion!!
regards,
Leroy
burtsz@a... wrote:
>
> They do not work on mosquitos (have it on very good authority) regardless of
> frequency. Not sure about other insects, flying or otherwise.
>
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--
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>If you can create an interference patter with sound waves that beats at
>at the same frequency as their wings vibrate and at a strong enough
>amplitude, they can not fly. Problems with current models are wrong
>frequency and not strong enough!! There's my opinion!!
Assuming for a second you are correct, such a device would sound like a
C-5A sized version of the target insect. You couldn't stand to live around
such a sound. Not practical.
Jim H
would do!!
leroy
Jim Highness wrote:
>
> At 10:22 08/04/01, Leroy Hall, Senior wrote:
>
> >If you can create an interference patter with sound waves that beats at
> >at the same frequency as their wings vibrate and at a strong enough
> >amplitude, they can not fly. Problems with current models are wrong
> >frequency and not strong enough!! There's my opinion!!
>
> Assuming for a second you are correct, such a device would sound like a
> C-5A sized version of the target insect. You couldn't stand to live around
> such a sound. Not practical.
>
> Jim H
>
sound interference on there wings. You don't necessaraly need the
same frequency. Why?
I've run into situations where it necessary to find how many rpms a
fan is turning. The easiest way is to flash a strobe and change the
frequency until the blades appear stationary. The catch however is
that the blades may be turning 2 times, 3 times faster.
My point is if the frequency you "need" is within the human range of
hearing then just double or if necessary triple it until its not
bothering you. Keep in my frequencies in this range may cause other
harmful interference. Also I doubt all insects flap there wings at
the same frequency.
Those are my ramblings for now.
generate harmonics that are higher multiples -- however, I don't believe
they generate harmonics that are lower in frequency than the original.
Original Message
> I'm guessing your trying to make it impossible to make insects fly by
> sound interference on there wings. You don't necessaraly need the
> same frequency. Why?
>
> I've run into situations where it necessary to find how many rpms a
> fan is turning. The easiest way is to flash a strobe and change the
> frequency until the blades appear stationary. The catch however is
> that the blades may be turning 2 times, 3 times faster.
>
> My point is if the frequency you "need" is within the human range of
> hearing then just double or if necessary triple it until its not
> bothering you. Keep in my frequencies in this range may cause other
> harmful interference. Also I doubt all insects flap there wings at
> the same frequency.
http://www.unizh.ch/~ormia/research_mosquitoes.html
"...Male mosquitoes have ears only for the girls. The antennal
flagellum constitutes a sharply tuned rensonant mechanical filter
sorting out sounds at frequencies between about 300 and 400 Hz. This
frequency range corresponds to the female-flight sounds, and only
these frequencies are transmitted to Johnston's organ. (G
Original Message
The following is from:
http://www.unizh.ch/~ormia/research_mosquitoes.html
"...Male mosquitoes have ears only for the girls. The antennal
flagellum constitutes a sharply tuned rensonant mechanical filter
sorting out sounds at frequencies between about 300 and 400 Hz. This
frequency range corresponds to the female-flight sounds, and only
these frequencies are transmitted to Johnston's organ. (G
female only
Leroy
Rodent wrote:
>
> Is it the male or female that bites?
>