### Author Topic: how CCD work in IR sensor  (Read 1190 times)

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#### shir

• Beginner
• Posts: 2
##### how CCD work in IR sensor
« on: June 21, 2012, 11:04:38 AM »
HI,

I want to ask how CCD work in Sharp IR sensor like GP2D12?

The sharp IR sensor shoots out a concentrated (by the lens) IR-light beam

The beam hits an object, and reflects back in all directions.

As the length from the object  increases, the returning lights degree will be steeper.

How the beam that hit the CCD,translate into length(x in my figure) or into angle?

I can measure the X by the hit pf the beam?
I know the b(the length between the eye and the ccd of the sensor) so i can know with b and the x the length the object is.

Thank u and sorry for the mistakes in english.

Shir

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: how CCD work in IR sensor
« Reply #1 on: June 23, 2012, 02:29:12 PM »
Hi,

How the beam that hit the CCD,translate into length(x in my figure) or into angle?

The "CCD" is an array of photo receptors with a lens in front of the array, so the reflected light dot will be concentrated on a small number of the receptors, which depends on the distance to the target. The calculation, based on the brightest lit (averaged) receptor is done inside the sensor.

Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

#### shir

• Beginner
• Posts: 2
##### Re: how CCD work in IR sensor
« Reply #2 on: June 23, 2012, 02:53:35 PM »
Quote
The calculation, based on the brightest lit (averaged)eceptor is done inside the sensor receptor is done inside the sensor.

Ok,so how exactly the calculation is made inside the sensor?

it's depand on the length of the brightest lit receptor from the middle ,from the center of the sensor,from the first receptor or somthing else?

The location of the brightest lit receptor is importent to the sensor beacuse it's considerate with it in the Microprocessor?

Are u understand my question?

Thank u !!!
Shir

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: how CCD work in IR sensor
« Reply #3 on: June 23, 2012, 03:15:00 PM »
Hi,

Ok,so how exactly the calculation is made inside the sensor?
What goes on inside the PSD's is proprietary - why do you want to know?

Are u understand my question?
Not entirely.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?