Something amusing - Sonic Teenager Repellent

[N. A. Corbier]

http://www.azcentral.com/offbeat/articles/1128teenbuzz-ON.html

This seems to be a high frequency sonic device, tested in England, that annoys teenagers so much that they will leave areas they usually "take over" and loiter around.

Anyone know about this, have experience with it, etc? A friend sent it to me as a comment on my personal livejournal.

[Mr. Security]

Speaking of teenagers, anyone have a device that jams the signal from a car stereo to the speakers? (besides wire cutters :p ) :D

[wisconsinite]

You wanna repel teenaged loiterers? teenagers intent on doing ill deeds? Blast some loud country music, or classical music, or church music, over PA speakers. That'll get them running like cockroaches when the lights go on! LOL

[ACP01]

Maybe once it is perfected they can come up with some adult sonic repellant.
I have seen some that make you want to stick an airhorn in their ear and not let up untill they leave. ;)

[crankloud]

i have found the best way to repell teens is to get grandma and grandpa to start making out in front of them.This not only repells teens but makes them very ill also. :)

[Bill Warnock]

In a recent survey, I recommended the installation of low pressure sodium lights to discourage the gathering of teens. The human face and hands under LPS are grotesque in the extreme. They were installed, no more gathering of teens. Interesting point, the teens never complained, they got their burgers and fries and left.
Enjoy the day,
Bill

[N. A. Corbier]

In a recent survey, I recommended the installation of low pressure sodium lights to discourage the gathering of teens. The human face and hands under LPS are grotesque in the extreme. They were installed, no more gathering of teens. Interesting point, the teens never complained, they got their burgers and fries and left.
Enjoy the day,
Bill

You know, people do look creepy under that unnatural pale... what is that? Pink? lighting.

[Charger]

We use the icky bluish-green sodiums here... And it works quite well... People tend to slink away from those areas... Somethin about those unnatural colors, I guess... lol

[Mr. Security]

You wanna repel teenaged loiterers? teenagers intent on doing ill deeds? Blast some .....classical music... That'll get them running like cockroaches when the lights go on! LOL

I like this idea. Opera would be another fine choice. :D

[Bill Warnock]

You know, people do look creepy under that unnatural pale... what is that? Pink? lighting.
N.A., LPS characteristics in which virtually all the visible energy is emitted from the "D" lines double at 589 and 589.6 nanometers (yellow) near the peak of the visibility curve of the eye, monochromatic.
Safety markings, black and yellow jumb out at you when illuminated by LPS.
Enjoy the snowfall and the day,
Bill

[wisconsinite]

nanowhaters? monochrohuh? speak english, man! LOL

[Mr. Security]

N.A., LPS characteristics in which virtually all the visible energy is emitted from the "D" lines double at 589 and 589.6 nanometers (yellow) near the peak of the visibility curve of the eye, monochromatic.
Safety markings, black and yellow jumb out at you when illuminated by LPS.
Enjoy the snowfall and the day,
Bill

English version please. :D

[Bill Warnock]

nanowhaters? monochrohuh? speak english, man! LOL
:D[QUOTE]
[QUOTE=Mr. Security]English version please. :D

Gentlemen: These is a security lighting term. A nanometer is a unit of measure equal to one billionth of a meter. So are lux, lumen, luminous intensity or candlepower and luminous flux. When we discuss visible light, which is very small part of the electromagnetic spectrum, wavelength is measured in nanometers.
These are the kinds of things we in this business need to know to insure we go home at night in the same physical condition as when we reported to our post or job.
When you are on post and you know in your heart of hearts the lighting stinks where you patrol either not enough or you instead of the perimeter is lighted, your very life may depend on adequate lighting of the proper kind and intensity. Lighting is just a tool like your radio, flashlight, baton, sidearm and chemical spray.
Your company may request the client conduct a lighting survey. If your company is worth its salt, a knowledgeable person will visit the site to observe what you observed and hopefully push the client into hiring a lighting consultant.
Various manufacturers publish lighting handbooks. ST&D from time to time publish articles written by lighting consultants.
I would encourage all of us to obtain a handbook from the company's library and read. Suggest you further purchase such a handbook to add to your personal security library.
Please remember, if we screw up, we may not go home at the end of the shift!
Enjoy the day,
Bill

[Mr. Security]

Gentlemen: These is a security lighting term. A nanometer is a unit of measure equal to one billionth of a meter. So are lux, lumen, luminous intensity or candlepower and luminous flux. When we discuss visible light, which is very small part of the electromagnetic spectrum, wavelength is measured in nanometers...

Is there a formula for converting candlepower into lumens?

[Bill Warnock]

Is there a formula for converting candlepower into lumens?
Footcandles incident on a surface = Lumens
÷
Area (sq. ft.)
a footcandle is the illumination at a point (A) on a surface which is one foot and perpendicular to a uniform point source of one candela.
Luminance is expressed in two ways: in caldelas per unit area or in lumens per unit area.
Enjoy thd day,
Bill

[Mr. Security]

Footcandles incident on a surface = Lumens
÷
Area (sq. ft.)
a footcandle is the illumination at a point (A) on a surface which is one foot and perpendicular to a uniform point source of one candela.
Luminance is expressed in two ways: in caldelas per unit area or in lumens per unit area.
Enjoy thd day,
Bill

Bear with me on this one. :confused: If I have a Surefire that's rated at 175 lumens, how much candlepower is that and how did you calculate it?

[Bill Warnock]

Bear with me on this one. :confused: If I have a Surefire that's rated at 175 lumens, how much candlepower is that and how did you calculate it?

You must use a footcandle meter. Select a matte surface. The light-sensitive element is faced toward the surface and slowly withdraw about 2 to 6 inches until the meter reading (A) is constant. A second reading (B) is taken when the light-sensitive element on the surface facing out to measure the incident light. Reading A divided by Reading B gives an approximate value for the reflectance on the surface.
CP= Footcandles X D(Superscript 2)
(D= Distance in feet from source to illuminated surface.)
Please remember: Inverse Square Law. The strength of a field or the intensity of radiation decreases in proportion to the square of the distance from its source.
Mr. Security, that information comes from Philips "Lighting Handbook." I take it along with my guide on every survey I conduct.
I normally recommend a "Lighting Consultant" visit the site and make this recommendations which are appended to my report along with other speciality consultants reports for a particular survey. We just can't wing it. That is why completed surveys are so expensive, minus travel, food and lodging.
Enjoy the day,
Bill

[ACP01]

You must use a footcandle meter. Select a matte surface. The light-sensitive element is faced toward the surface and slowly withdraw about 2 to 6 inches until the meter reading (A) is constant. A second reading (B) is taken when the light-sensitive element on the surface facing out to measure the incident light. Reading A divided by Reading B gives an approximate value for the reflectance on the surface.
CP= Footcandles X D(Superscript 2)
(D= Distance in feet from source to illuminated surface.)
Please remember: Inverse Square Law. The strength of a field or the intensity of radiation decreases in proportion to the square of the distance from its source.
Mr. Security, that information comes from Philips "Lighting Handbook." I take it along with my guide on every survey I conduct.
I normally recommend a "Lighting Consultant" visit the site and make this recommendations which are appended to my report along with other speciality consultants reports for a particular survey. We just can't wing it. That is why completed surveys are so expensive, minus travel, food and lodging.
Enjoy the day,
Bill

All I can say is, "I am glad someone with your indepth knowledge and experieance is willing to share what they have learned. Thank you."

[Mr. Security]

All I can say is, "I am glad someone with your indepth knowledge and experieance is willing to share what they have learned. Thank you."

I second that. I thought I did well in physics, but I guess I missed a few lessons. :o

There isn't going to be a quiz on this, is there? :eek: By the way, here's a layman's method for determining which flashlight is brighter: Simply point it at your eyes and turn it on for a moment. The longer you're blind the brighter the flashlight. :p (I know; not very bright - pun intended) :)

[N. A. Corbier]

All I can say is, I knew what a nanometer was, as well as monochromatic.

All light can be measured in Kelvin. I learned this when I started playing with Photoshop, as well in studying photography, and playing with lasers. :)

I'm not that well versed in measuring lighting in nanometer on the EM field, I'm usually describing lighting in Degrees Kelvin (3000-5000 or so) for getting rid of red eye and other crap.

Thanks, Bill. Both for telling everyone what it was way better than I could, and for whipping out the Phillips Lighting Manual.

[Bill Warnock]

All I can say is, "I am glad someone with your indepth knowledge and experieance is willing to share what they have learned. Thank you."
You are welcome.
We are all in this together and there is more than enough work for all of us, so if we share, we all gain, if we don't, none of us gain.
If you have a chance, please see if any of your company's management has any association with the Illumination Engineers Society-North America? Those folks are a godsend for us in this profession.
Enjoy the day,
Bill

[Bill Warnock]

All I can say is, I knew what a nanometer was, as well as monochromatic.

All light can be measured in Kelvin. I learned this when I started playing with Photoshop, as well in studying photography, and playing with lasers. :)

I'm not that well versed in measuring lighting in nanometer on the EM field, I'm usually describing lighting in Degrees Kelvin (3000-5000 or so) for getting rid of red eye and other crap.

Thanks, Bill. Both for telling everyone what it was way better than I could, and for whipping out the Phillips Lighting Manual.

You and Mr. Security are most welcome. All of us in this business, security companies, security consultants should have a Lighting Manual at hand. I like Philips because they explain every aspect. I can not speak for other luminary makers.
N.A., it is neat, the Kelvin scale its temperature scale has its zero point at -270 degrees Celsius.
As for the explanation, it is so important in a survey when you are trying to help a fellow professional. Most of my training was at government expense for the work I was doing within the DOD and DOJ communities.
Thanks again.
Enjoy the day,
Bill