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Science Forum Index » Electronics Forum » Speed measurement help
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| Yen Pham |
 Posted: Mon Aug 25, 2003 2:48 pm |
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Guest
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Hi,
Can someone points me in the right direction with this problem. I need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
Yen |
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| Repeating Decimal |
| Posted: Mon Aug 25, 2003 6:30 pm |
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in article TCu2b.278$%B4.34890865@newssvr14.news.prodigy.com, Yen Pham
@soter-technologies.com> at <my_first_name wrote on 8/25/03 1:48 PM:
Quote: Hi,
Can someone points me in the right direction with this problem. I need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
Yen
If you don't have time to engineer, why would you expect someone else, who
is not a vendor, to do it for you. If I knew, without search or effort where
you could get one, I might happily let you know. If I did that kind of
consulting for a living, I would quote you a price. But I do not.
Bill |
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| Louis Boyd |
| Posted: Mon Aug 25, 2003 7:52 pm |
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Guest
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Yen Pham < wrote:
Quote: Hi,
Can someone points me in the right direction with this problem. I need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
This uses microwaves rather than lasers but it looks like it will do
what you want quite nicely.
http://www.radarsport.com/equipmentStalker.html
Accuracy ± 0.1 MPH
Speed Range 1-300 MPH
Target Acquisition Time 0.01 Seconds
Microwave System Ka Band, 20 mw
Weight 3.2 Pounds
Data Output TTL and RS-232
Output Sample Rate 31.25 Per Second
Display Units MPH, KPH and Knots
Estimated Range (baseball) 450 feet
Price $2500.
--
Lou Boyd |
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| Ghost Chip |
| Posted: Mon Aug 25, 2003 9:31 pm |
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Guest
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150mph is 220 ft/sec which is at the lower end of what archery and shooting chronographs can measure. Check out Oehler ( http://www.oehler-research.com/ ) or Chrony ( http://chrony.ca/ ) suppliers.
Ghost
"Yen Pham @soter-technologies.com>" <<my_first_name> wrote in message news:TCu2b.278$%B4.34890865@newssvr14.news.prodigy.com...
Quote: Hi,
Can someone points me in the right direction with this problem. I need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
Yen
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| Opto |
| Posted: Tue Aug 26, 2003 5:13 am |
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Repeating Decimal <salmonfry@sbcglobal.net> wrote in message news:<BB6FF85F.83A9%salmonfry@sbcglobal.net>...
Quote: in article TCu2b.278$%B4.34890865@newssvr14.news.prodigy.com, Yen Pham
@soter-technologies.com> at <my_first_name wrote on 8/25/03 1:48 PM:
Hi,
Can someone points me in the right direction with this problem. I need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
Yen
If you don't have time to engineer, why would you expect someone else, who
is not a vendor, to do it for you. If I knew, without search or effort where
you could get one, I might happily let you know. If I did that kind of
consulting for a living, I would quote you a price. But I do not.
Bill
Bill,
For pete's sake, lay off the guy, would you? People ask for vendor
recommendations quite often on newsgroups. You need to learn to relax
a little bit.
Opto |
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| Fred Bloggs |
| Posted: Tue Aug 26, 2003 6:26 am |
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Guest
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Quote: Hi,
Can someone points me in the right direction with this problem. I
need to
buy a calibrated device that can measure the speed of an object to within
+/-1%. The object is fairly small at about 3" diameter and moving at
about
150mph in a known path. Is there something like a calibrated laser speed
trap that I can buy from somewhere that will give me these
measurements? We
don't really have time to engineer something at the moment, so an off the
shelf solution would be perfect. Your assistance is greatly appreciated.
This uses microwaves rather than lasers but it looks like it will do
what you want quite nicely.
http://www.radarsport.com/equipmentStalker.html
Accuracy ± 0.1 MPH
Speed Range 1-300 MPH
Target Acquisition Time 0.01 Seconds
Microwave System Ka Band, 20 mw
Weight 3.2 Pounds
Data Output TTL and RS-232
Output Sample Rate 31.25 Per Second
Display Units MPH, KPH and Knots
Estimated Range (baseball) 450 feet
Price $2500.
--
Lou Boyd
Also from the same manufacturer:
"Many may not understand why radar performance and clocking distance is
so important. To get correct readings, a radar needs to be placed in the
line of travel of objects (it cannot clock objects at angles or as they
go by). In the real world, the radar gun needs to be placed far away
from the target. That is why Stalkers are designed to provide
extraordinarily long clocking range. "
So that 1% accuracy implies cos(a)>=0.99 or less than 8 degrees
deviation from velocity angle. |
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| Bob May |
| Posted: Tue Aug 26, 2003 1:25 pm |
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Guest
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Auto radar speed trap systems have been used for objects that size
(baseballs for one) and they generally go higher than that for a max speed.
--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works evevery time it is tried! |
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| Ghost Chip |
| Posted: Wed Aug 27, 2003 8:57 pm |
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Guest
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"Opto" <optoconsulting@mail.com> wrote in message
news:d67a67b8.0308260313.2c01a238@posting.google.com...
Quote: Repeating Decimal <salmonfry@sbcglobal.net> wrote in message
news:<BB6FF85F.83A9%salmonfry@sbcglobal.net>...
in article TCu2b.278$%B4.34890865@newssvr14.news.prodigy.com, Yen Pham
@soter-technologies.com> at <my_first_name wrote on 8/25/03 1:48 PM:
Hi,
Can someone points me in the right direction with this problem. I
need to
buy a calibrated device that can measure the speed of an object to
within
+/-1%. The object is fairly small at about 3" diameter and moving at
about
150mph in a known path. Is there something like a calibrated laser
speed
trap that I can buy from somewhere that will give me these
measurements? We
don't really have time to engineer something at the moment, so an off
the
shelf solution would be perfect. Your assistance is greatly
appreciated.
Yen
If you don't have time to engineer, why would you expect someone else,
who
is not a vendor, to do it for you. If I knew, without search or effort
where
you could get one, I might happily let you know. If I did that kind of
consulting for a living, I would quote you a price. But I do not.
Bill
Bill,
For pete's sake, lay off the guy, would you? People ask for vendor
recommendations quite often on newsgroups. You need to learn to relax
a little bit.
Opto
If we're not being paid to recommend a solution or supplier, then it is an
opinion, not an add.
Ghost |
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