Messages

1

Optics / Grin lens 1,5 Working Distance

« on: October 11, 2017, 09:40:49 AM »

Hi all,
I have read that Go Photon is providing custom GRIN lenses with 1.5mm working distance. Has anyone tried them?? Do you know they FOV they have?? If anyone in Europe is interested on trying them, we can buy together so we can share costs.

Regards
Javier

2

Optics / Re: grin lenses working distance

« on: January 27, 2017, 11:47:47 AM »

Hi Daniel,

Sorry for my bad explanation. What I meat is that as the pitch is 0.42, these lenses act like a relay lens. They take an image of around 1.6mm of FOV from 1mm away from the top of the lens (so 1 mm working distance) and place that image in the bottom of the lens. What I am trying now, is to stick to the bottom of this lens the 0.25 pitch grin lens. This second lens will collect the image from the bottom of the first lens. At the moment I am having some good results, however both lenses should be well placed and super clean.

Thanks for your help
Javier

3

Optics / Re: grin lenses working distance

« on: January 26, 2017, 08:37:47 AM »

Hi Daniel,

The thing is that when I asked for lenses with a longer woking distance the pitch this lenses have is bigger (0.42) so they create an intermediate image which increase the tube lens size and the FOV to 1.6 mm. I have read that you are woking with Go Photon to make lenses with longer working distance mantaining a small pitch, do you know when they will be realsed?

Thanks again for all your help

Javier

4

Optics / Re: grin lenses working distance

« on: January 19, 2017, 12:54:23 PM »

Hi again!

I have done some experiments following your advices and I have been able to shift the working distance from 0-200um aprox. However due to the short focal length of the lens, sensor and lens ended up very close, and I was not able to increase more the working distance. Is it possible to increase the working distance to more than 0.5 by using lenses with longer focal lengths?  Or the working distance is not dependent on the focal length of the achromatic lens.

Thanks

5

System Assembly Troubleshooting / Re: Printing files of the Housing parts

« on: December 19, 2016, 07:54:58 AM »

Yes, Thanks for the quick reply!

6

System Assembly Troubleshooting / Printing files of the Housing parts

« on: December 15, 2016, 03:02:16 PM »

Hi all,

I have been looking for the printing files of the housing parts in the following link "https://github.com/daharoni/Miniscope_Machined_Parts", but I only see the .sldprt files. Do you have the files in .stl?

Also, did anyone in Europe try to make them? Do you know of any company (in Europe) able to make this parts ? more or less, how much could it be?

Thanks for your help
Javier

7

Optics / Re: grin lenses working distance

« on: December 01, 2016, 08:04:51 AM »

Hi Daniel,

It answer my questions, thanks for the quick reply!!

8

Optics / grin lenses working distance

« on: November 30, 2016, 10:39:32 AM »

Hi all!

I am working with GRIN lenses and I have some questions about them. I have read the Grintech datasheet and it says that the GT-IFRL-200-inf-50-NC lenses have a infinity Working Distance (WD), while for example the GT-IFRL-200-005-50-NC is 5mm. However you say the WD you are using is from 0 to 0.2mm, is it because the longer the WD the higher the scattering and the lower the image quality? if this is the case, why don't you use a lens with a lower WD?, is the pitch different?
Also when using a 0.25 pitch grin lens, all the rays come out from the lens parallel and the achromatic lens create the image in the sensor. How does the sliding the sensor up and down shift the focal plane, is not the focal plane determined by the WD of the grin lens??
Thanks for your help!!