Astrotweeps: Amber

@astrotweeps

Admins • • A new astronomer/planetary scientist tweeting about space each week.

The Universe
Vrijeme pridruživanja: siječanj 2014.

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  1. Prikvačeni tweet
    26. sij

    Hello! I'm Amber Hornsby (), an astronomer/physicist based at Cardiff University who is working on next-generation instrumentation for studying cool things like the cosmic microwave background. I'll be taking over astrotweeps this week 🌟

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  2. 31. sij

    It's almost talk o'clock at the residential and I feel super sick. I've given lots of talks now, but I still get nervous every time. It'll pass once I start talking, but for now it's no fun

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  3. proslijedio/la je Tweet
    30. sij

    At 2:34 pm PST on Jan. 30, 2020, Spitzer Project Manager Joseph Hunt declared the Spitzer spacecraft decommissioned. Farewell, Spitzer. Thank you for the great science. 👋

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  4. 30. sij

    As a grad student, I'm thoroughly enjoying this thread

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  5. 30. sij

    This is incredible! I've watched this so many times

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  6. 30. sij

    For me, the most fun aspect is that I participated in this course 4 years ago when I was a final year undergrad. I'm now attending as a final-year undergrad who is giving a "survival guide" talk tomorrow morning. It's weirdly full circle

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  7. 30. sij

    The theme is "manufacturing the future" and is based on a real proposal call by the Engineering and Physical Sciences Research Council (EPSRC)

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  8. 30. sij

    Although a little intense, this is a really fun trip which teaches students a very important skill. Plus it's in a huge, old house which is beautiful and full of cool stuff.

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  9. 30. sij

    The aim of the trip is to work together, with students from 2 other physics departments, to put together a research proposal over 4(ish) days.

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  10. 30. sij

    Apologies for going quiet, but it's been a busy few days at work. But, I still have some exciting things to tweet about this week as I've ended up on the undergrad residential trip 🌟

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  11. 28. sij

    So students measure the voltage in, out and try and work out how much the output lags behind the input. Some wizardry later, and students can extract the value of the capacitance :)

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  12. 28. sij

    And the output signal lags behind the input signal. There's a so-called phase difference. As you increase the frequency from 200 to 3000 Hz, the output, blue wave is catching the input signal up and is much closer in amplitude too

    A white oscilloscope with grey, yellow And blue buttons...some dials. This time, the blue output signal is only slightly smaller in amplitude when compared to the yellow input signal. The blue wave lags behind the yellow wave, but not as much.
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  13. 28. sij

    Students use an oscilloscope to monitor the input signal and the output signal (which is measured across the resistor). Here the input is the yellow wave, and the output is the blue wave. At low frequencies, the amplitude of the output signal is lower than the input...

    An white oscilloscope with grey, yellow and blue buttons. The black screen had a yellow and blue sine wave visible, where the blue wave has a smaller amplitude than the yellow wave.
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  14. 28. sij

    Back to the experiment. Students use this signal generator to investigate the RC circuit by changing the frequency of their input signal

    A signal generator, with dials, numbers and various buttons for controlling the output of the box. There's also a black screen for reading out the frequency and amplitude of the signal. Currently it's set at 200 Hz and 3 V
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  15. 28. sij

    And they may not seen obviously useful from an astronomy point of view, but they're often crucial for getting good data from instruments. They can be used to remove unwanted signals created by electrical circuits you might be using to obtain your data - for example.

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  16. 28. sij

    But if you use a alternating voltage, then currents can flow on and off the plates. Here low frequency signals struggle, but high frequencies are okay. This is kind of how the filter works.

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  17. 28. sij

    Resistors impede current flow in an electrical circuit, and so do capacitors. Sort of. When you apply a constant voltage, charge builds up on the two plates of a capacitor and can't jump the gap between them - it can't flow.

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  18. 28. sij

    But, in reality, this is what students are looking at - an orange capacitor and resistor. Top points for identifying the resistance of the resistor from its bands of colour.

    An orange capacitor and resistor in series on a protoboard/breadboard. The resistor colour bands are gold, red, orange and yellow.
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  19. 28. sij

    Shamelessly stolen from the lab manual, here is the circuit diagram for the experiment.

    Circuit diagram detailing some of the experimental set up. A capacitor is in series with resistor, and the output voltage of the circuit is measured across the resistor
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  20. 28. sij

    So, experiment number 1 - resonance in an electrical circuit. My favourite. Today, students will measure the properties of a high-pass frequency filter, formed of a resistor and capacitor in series, by passing various frequencies through the circuit and seeing how they change

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  21. 28. sij

    Good afternoon! Today is the first experimental labs of the new semester at Cardiff. As a PhD demonstrator, I get to supervise two fun experiments - resonance in an electrical circuit and resistance vs. temperature

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