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Phil Hobbs
Guest
Fri Mar 05, 2010 2:35 am
On 3/4/2010 7:01 PM, Samuel M. Goldwasser wrote:
Quote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
That's true only if the beam isn't vignetted--i.e. if you use a lens to
spread the 6W out over a solar cell that can handle the power. Laser
noise (especially in gas and diode lasers) often has a pronounced
spatial variation. For instance, when there are multiple modes, each
mode in itself may be much noisier than the total beam.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
Guest
Fri Mar 05, 2010 4:37 pm
On 04 Mar 2010 19:01:38 -0500, sam_at_repairfaq.org (Samuel M.
Goldwasser)wrote:
Quote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
I like spitting the beam with a diffraction grating or even with a
pair of these newer 3D glasses.
GregS
Guest
Mon Mar 08, 2010 2:55 pm
In article <f85b3ee2-2adb-43e9-a16f-825259a9ed24_at_w27g2000pre.googlegroups.com>, Robert Macy <macy_at_california.com> wrote:
Quote:
On Mar 4, 4:01=A0pm, s...@repairfaq.org (Samuel M. Goldwasser) wrote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
--
=A0 =A0 sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/
=A0Repair | Main Table of Contents:http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ:http://www.repairfaq.org/sam/lasersam.htm
=A0 =A0 =A0 =A0 | Mirror Sites:http://www.repairfaq.org/REPAIR/F_mirror.h=
tml
Important: Anything sent to the email address in the message header above=
is
ignored unless my full name AND either lasers or electronics is included =
in the
subject line. =A0Or, you can contact me via the Feedback Form in the FAQs=
..
Pre-apologize for the naive question:
Are you measuring amplitude noise and/or spectral noise?
Are these valid questions?
I'm mostly concerned with power supply noise or whatever is predominant.
greg
Samuel M. Goldwasser
Guest
Tue Mar 09, 2010 1:14 am
zekfrivo_at_zekfrivolous.com (GregS) writes:
Quote:
In article <f85b3ee2-2adb-43e9-a16f-825259a9ed24_at_w27g2000pre.googlegroups.com>, Robert Macy <macy_at_california.com> wrote:
On Mar 4, 4:01=A0pm, s...@repairfaq.org (Samuel M. Goldwasser) wrote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
--
=A0 =A0 sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/
Pre-apologize for the naive question:
Are you measuring amplitude noise and/or spectral noise?
Are these valid questions?
I'm mostly concerned with power supply noise or whatever is predominant.
What type of laser are you using (sorry if I forgot!)?
If it's a diode laser, looking at an electrical signal from the power supply
that corresponds to the laser diode current may be nearly as good as looking
at the laser's output and doesn't require a sensor. :)
--
sam | Sci.Electronics.Repair FAQ:
http://www.repairfaq.org/
Repair | Main Table of Contents:
http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ:
http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites:
http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
GregS
Guest
Tue Mar 09, 2010 3:02 pm
In article <ubpeyfj15.fsf_at_repairfaq.org>, sam_at_repairfaq.org (Samuel M. Goldwasser) wrote:
Quote:
zekfrivo_at_zekfrivolous.com (GregS) writes:
In article
f85b3ee2-2adb-43e9-a16f-825259a9ed24_at_w27g2000pre.googlegroups.com>, Robert
Macy <macy_at_california.com> wrote:
On Mar 4, 4:01=A0pm, s...@repairfaq.org (Samuel M. Goldwasser) wrote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
--
=A0 =A0 sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/
Pre-apologize for the naive question:
Are you measuring amplitude noise and/or spectral noise?
Are these valid questions?
I'm mostly concerned with power supply noise or whatever is predominant.
What type of laser are you using (sorry if I forgot!)?
If it's a diode laser, looking at an electrical signal from the power supply
that corresponds to the laser diode current may be nearly as good as looking
at the laser's output and doesn't require a sensor. :)
Right, but getting to the right point is somewhat of a risk. I don't want to send anymore lasers back to China.
Greg
Samuel M. Goldwasser
Guest
Wed Mar 10, 2010 1:43 am
zekfrivo_at_zekfrivolous.com (GregS) writes:
Quote:
In article <ubpeyfj15.fsf_at_repairfaq.org>, sam_at_repairfaq.org (Samuel M. Goldwasser) wrote:
zekfrivo_at_zekfrivolous.com (GregS) writes:
In article
f85b3ee2-2adb-43e9-a16f-825259a9ed24_at_w27g2000pre.googlegroups.com>, Robert
Macy <macy_at_california.com> wrote:
On Mar 4, 4:01=A0pm, s...@repairfaq.org (Samuel M. Goldwasser) wrote:
Meat Plow writes:
What about using a lens to spread the light?
Wouldn't that effect or distort the noise or influence the reading
otherwise?
Not as long as the noise relative to the total power into the sensor
is what's measured.
--
=A0 =A0 sam | Sci.Electronics.Repair FAQ:http://www.repairfaq.org/
Pre-apologize for the naive question:
Are you measuring amplitude noise and/or spectral noise?
Are these valid questions?
I'm mostly concerned with power supply noise or whatever is predominant.
What type of laser are you using (sorry if I forgot!)?
If it's a diode laser, looking at an electrical signal from the power supply
that corresponds to the laser diode current may be nearly as good as looking
at the laser's output and doesn't require a sensor. :)
Right, but getting to the right point is somewhat of a risk. I don't want to send anymore lasers back to China.
Maybe best to just leave them there in the first place. :)
--
sam | Sci.Electronics.Repair FAQ:
http://www.repairfaq.org/
Repair | Main Table of Contents:
http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ:
http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites:
http://www.repairfaq.org/REPAIR/F_mirror.html
Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
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