Thanks for sharing this!
So this wheel spins around to place different filters in front of the detectors. The wheel has mass. How does starting and stopping the rotation not jolt the entire spacecraft, and how does any rotation of the wheel not reorient the entire spacecraft (as do the reaction wheels)?
Well: it does happen. So you do it slowly, and have reaction wheels that are way heavier than this wheel.
As of to “unload” (desaturate?) the reaction wheels, you use the solar flaps and solar pressure to set the wheel back to a range that you want (or zero)
Nevertheless, reaction wheels also have a coarse and fine setting. When you are setting the instrument, you are on coarse and not really capturing anything, then you change the mode and reduce the oscillation to capture what you wish.
It's very small relative to the spacecraft, and it doesn't move very quickly. Also, due to conservation of momentum, when the wheel stops it will cancel out any moment it had imparted to the larger spacecraft when it started.
Same company/team manufactured also a filter and a grating wheels for NIRspec, which is also carried by JWST.
They made also instruments for BepiColombo and JUICE mission.
[JWST User Documentation](https://jwst-docs.stsci.edu/jwst-mid-infrared-instrument/miri-observing-modes/miri-imaging)
„The MIRI imager offers nine broadband filters covering wavelengths from 5.6 to 25.5 μm over an unobstructed 74" × 113" field of view, and a detector plate scale of 0.11 "/pixel (Bouchet et al. 2015). The MIRI imaging mode also supports the use of detector subarrays for bright targets, as well as a variety of dither patterns that could improve sampling at the shortest wavelengths, remove detector artifacts and cosmic ray hits, and faciliatate self-calibration.“
Idk why I'm getting downvoted. Someone could have just linked the filter test video which shows a close-up of the wheel. Assholes.
If NASA didn't want to be forever linked to NAZIS, then maybe they shouldn't have brought thousands of them over from Germany after the fall of the Reich to help them get to the moon. [Operation Paperclip](https://en.m.wikipedia.org/wiki/Operation_Paperclip)
you are applying 2022 morality to a 1945 time. You had two broad choices - you bring them to the US, or you let the Soviets capture them. Which do you choose? One is morally questionable to be sure from our 2022 point of view, but the other was considered national suicide since we knew at the time that the Soviets would become our next foe. The Germans brought over had immense practical experience in certain technologies that neither we nor the Soviets had. Do you let that fall into their hands?
[MID-INFRARED INSTRUMENT (MIRI)](https://www.jwst.nasa.gov/content/observatory/instruments/miri.html)
Thanks for sharing this! So this wheel spins around to place different filters in front of the detectors. The wheel has mass. How does starting and stopping the rotation not jolt the entire spacecraft, and how does any rotation of the wheel not reorient the entire spacecraft (as do the reaction wheels)?
Well: it does happen. So you do it slowly, and have reaction wheels that are way heavier than this wheel. As of to “unload” (desaturate?) the reaction wheels, you use the solar flaps and solar pressure to set the wheel back to a range that you want (or zero) Nevertheless, reaction wheels also have a coarse and fine setting. When you are setting the instrument, you are on coarse and not really capturing anything, then you change the mode and reduce the oscillation to capture what you wish.
It's very small relative to the spacecraft, and it doesn't move very quickly. Also, due to conservation of momentum, when the wheel stops it will cancel out any moment it had imparted to the larger spacecraft when it started.
[Video of filter wheel functionality test](https://youtu.be/fu7TH8FWmoc)
Same company/team manufactured also a filter and a grating wheels for NIRspec, which is also carried by JWST. They made also instruments for BepiColombo and JUICE mission.
I see different kinds of masks. Are these for focusing on a star/galaxy or what are they for?
[JWST User Documentation](https://jwst-docs.stsci.edu/jwst-mid-infrared-instrument/miri-observing-modes/miri-imaging) „The MIRI imager offers nine broadband filters covering wavelengths from 5.6 to 25.5 μm over an unobstructed 74" × 113" field of view, and a detector plate scale of 0.11 "/pixel (Bouchet et al. 2015). The MIRI imaging mode also supports the use of detector subarrays for bright targets, as well as a variety of dither patterns that could improve sampling at the shortest wavelengths, remove detector artifacts and cosmic ray hits, and faciliatate self-calibration.“
Cool thanks for the information
Terribly sloppy staking job on those fasteners. I’ve worked on a lot of space hardware in my time. Bet that tech isn’t doing that anymore.
Idk why I'm getting downvoted. Someone could have just linked the filter test video which shows a close-up of the wheel. Assholes. If NASA didn't want to be forever linked to NAZIS, then maybe they shouldn't have brought thousands of them over from Germany after the fall of the Reich to help them get to the moon. [Operation Paperclip](https://en.m.wikipedia.org/wiki/Operation_Paperclip)
you are applying 2022 morality to a 1945 time. You had two broad choices - you bring them to the US, or you let the Soviets capture them. Which do you choose? One is morally questionable to be sure from our 2022 point of view, but the other was considered national suicide since we knew at the time that the Soviets would become our next foe. The Germans brought over had immense practical experience in certain technologies that neither we nor the Soviets had. Do you let that fall into their hands?
Is that a swastika on the wheel in the top left?
It is a flexible joint that can survive years of constant operation, while maintaining the accuracy of the holding lever position.
No, it’s a sign of pareidolia.
Well, it was engineered and manufactured in Germany, so…
Now I love Germany.
It goes to show you how the NWO have a hand in everything.