Howdy So I came across those two components which can solve our positioning problem with the wafer:
Those LEDs produce a light within the spectrum we need in order to shine through silicon (1000nm ~ 1400nm): https://tech-led.com/en/product/ir-nir-leds/
The OV5647 is sensible up to at least 1000 nm and is quite affordable: https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
There are OV5647 imaging modules available for Raspberry Pi. I'll try to contact Marubemi directly and ask them for a quotation on their NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll also check with them for a potentially more suitable CMOS sensor, then I'll compare the prices. As I've discussed with Dilek, the goal is to produce an affordable stepper suitable for hobbyists and small labs with limited budget.
Cheers David
Hi all I just woke up from bed again with the idea to use use laser triangulation for the distance measurement, since there's an inexpensive solution already for Arduino: https://rohling-de.blogspot.com/2017/04/shooting-laser-to-measure-distance.h... https://www.st.com/resource/en/datasheet/vl6180x.pdf The internal ADC has a resolution of 16 bits, which should be sufficient to resolve the small distance a table for a 2 inch wafer has to travel.
Cheers David
On Sunday, August 1, 2021 2:46:34 PM WEST David Lanzendörfer wrote:
Howdy So I came across those two components which can solve our positioning problem with the wafer:
Those LEDs produce a light within the spectrum we need in order to shine through silicon (1000nm ~ 1400nm): https://tech-led.com/en/product/ir-nir-leds/
The OV5647 is sensible up to at least 1000 nm and is quite affordable: https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
There are OV5647 imaging modules available for Raspberry Pi. I'll try to contact Marubemi directly and ask them for a quotation on their NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll also check with them for a potentially more suitable CMOS sensor, then I'll compare the prices. As I've discussed with Dilek, the goal is to produce an affordable stepper suitable for hobbyists and small labs with limited budget.
Cheers David
Looks good David,
I started to create a road map to be discussed.
Dilek
-------- Original Message -------- On Aug 1, 2021, 7:57 PM, David Lanzendörfer wrote:
Hi all I just woke up from bed again with the idea to use use laser triangulation for the distance measurement, since there's an inexpensive solution already for Arduino: https://rohling-de.blogspot.com/2017/04/shooting-laser-to-measure-distance.h... https://www.st.com/resource/en/datasheet/vl6180x.pdf The internal ADC has a resolution of 16 bits, which should be sufficient to resolve the small distance a table for a 2 inch wafer has to travel.
Cheers David
On Sunday, August 1, 2021 2:46:34 PM WEST David Lanzendörfer wrote:
Howdy So I came across those two components which can solve our positioning problem with the wafer:
Those LEDs produce a light within the spectrum we need in order to shine through silicon (1000nm ~ 1400nm): https://tech-led.com/en/product/ir-nir-leds/
The OV5647 is sensible up to at least 1000 nm and is quite affordable: https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
There are OV5647 imaging modules available for Raspberry Pi. I'll try to contact Marubemi directly and ask them for a quotation on their NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll also check with them for a potentially more suitable CMOS sensor, then I'll compare the prices. As I've discussed with Dilek, the goal is to produce an affordable stepper suitable for hobbyists and small labs with limited budget.
Cheers David
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Awesome Dilek! I'm looking forward to discussing it!
David
On Monday, August 2, 2021 4:58:32 AM WEST Dilek Isik Akcakaya wrote:
Looks good David,
I started to create a road map to be discussed.
Dilek
-------- Original Message --------
On Aug 1, 2021, 7:57 PM, David Lanzendörfer wrote:
Hi all I just woke up from bed again with the idea to use use laser triangulation for the distance measurement, since there's an inexpensive solution already for Arduino: https://rohling-de.blogspot.com/2017/04/shooting-laser-to-measure-distance .html https://www.st.com/resource/en/datasheet/vl6180x.pdf The internal ADC has a resolution of 16 bits, which should be sufficient to resolve the small distance a table for a 2 inch wafer has to travel.
Cheers David
On Sunday, August 1, 2021 2:46:34 PM WEST David Lanzendörfer wrote:
Howdy So I came across those two components which can solve our positioning problem with the wafer:
Those LEDs produce a light within the spectrum we need in order to shine through silicon (1000nm ~ 1400nm): https://tech-led.com/en/product/ir-nir-leds/
The OV5647 is sensible up to at least 1000 nm and is quite affordable: https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
There are OV5647 imaging modules available for Raspberry Pi. I'll try to contact Marubemi directly and ask them for a quotation on their NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll also check with them for a potentially more suitable CMOS sensor, then I'll compare the prices. As I've discussed with Dilek, the goal is to produce an affordable stepper suitable for hobbyists and small labs with limited budget.
Cheers David
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Dilek Isik Akcakaya