(meteorobs) Meteors, natural and otherwise

[stange34 at sbcglobal.net]

Hi Chris, I failed language101. Please excuse the poor iteration.

The Sentinel system has settable pixel threshold levels which determine 
sensitivity for a given enviournmental light condition using a mask and the 
additional light coming from an object.

The count of pixels for inside a mask in the enviournment is added to the 
number of pixels set for the trigger threshold,  which is a total number of 
all pixels.  Camera trigger is a pixel count which exceeds the sum of those 
pixels.

Saying it another way......The meteor pixel counts must be over (number of 
pixels set for the mask + threshold count of pixels) to trigger an event. I 
reduced my mask pixel count to (50% of normal) to 10 pixels and also changed 
my Light & Contrast settings to avoid too many false triggers.

The trial an error part is maximum sensitivity without falsing, and 
attempting to still capure reference stars in my poor location. Your sky 
would be ideal for me.

Larry
YCSentinel


----- Original Message ----- 
From: "Chris Peterson" <clp at alumni.caltech.edu>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2007/10/21 13:29
Subject: Re: (meteorobs) Meteors, natural and otherwise


>> I will try a much higher sensitivity setting to help
>> offset the reduction in magnitude.
>
> What does that mean? Is this some kind of threshold setting used by the
> Sentinel system? The PC164C is always operating at maximum sensitivity,
> i.e. maximum S/N, so there's no way to change its true sensitivity. I'd
> expect any meteor detection software to already be operating at a
> detection threshold just above the noise floor of the camera.
>
> Chris
>
> *****************************************
> Chris L Peterson
> Cloudbait Observatory
> http://www.cloudbait.com
>
>
> ----- Original Message ----- 
> From: <stange34 at sbcglobal.net>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: Saturday, October 20, 2007 10:53 PM
> Subject: Re: (meteorobs) Meteors, natural and otherwise
>
>
>> OK Chris, thankyou.
>>
>> That settles it.... I am going to try day & night with the IR dome
>> starting
>> right now.(15 minutes). I will try a much higher sensitivity setting
>> to help
>> offset the reduction in magnitude.
>>
>> Just "maybe" it can do both worlds with a common sensitivity setting
>> without
>> too much false triggering...... It will be an interesting trial
>>
>> Larry
>
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