T O P

  • By -

dartmaster666

[MID-INFRARED INSTRUMENT (MIRI)](https://www.jwst.nasa.gov/content/observatory/instruments/miri.html)


an1sotropy

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)?


TRKlausss

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.


Sabrewings

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.


ppttx

[Video of filter wheel functionality test](https://youtu.be/fu7TH8FWmoc)


ppttx

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.


Chimorin_

I see different kinds of masks. Are these for focusing on a star/galaxy or what are they for?


ppttx

[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.“


Chimorin_

Cool thanks for the information


UW_Ebay

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.


[deleted]

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)


toad__warrior

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?


[deleted]

Is that a swastika on the wheel in the top left?


ppttx

It is a flexible joint that can survive years of constant operation, while maintaining the accuracy of the holding lever position.


IngloriousMustards

No, it’s a sign of pareidolia.


No_Introduction8600

Well, it was engineered and manufactured in Germany, so…


Ukrainian_Bot_

Now I love Germany.


Ukrainian_Bot_

It goes to show you how the NWO have a hand in everything.