| 研究課題/領域番号 |
20K04516
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| 研究機関 | 宇都宮大学 |
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研究代表者 |
ヘーガン ネイザン 宇都宮大学, 工学部, 准教授 (50781506)
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| 研究期間 (年度) |
2020-04-01 – 2023-03-31
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| キーワード | profilometry / passive measurement / range measurement / snapshot |
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| 研究実績の概要 |
While assembling the passive measurement system, I was able to use an already-available active illumination setup to perform a series of experiments as a step towards the final system. With this system, I was able to measurement the interference fringe contrast reflected from a number of different sample types: white paper, white paint, white ceramic, brushed aluminum, a water-wet white surface, and an aluminum mirror. Using multiple channels independently, I could confirm that it is possible to measure the 3D profile of each surface in a snapshot and at video rate. With this active system I also confirmed that I will be able to expand the dynamic range of the measurements by sampling wavelengths over a wide spectral range. Finally, by changing the objective lens, I could adjust the measurement scale.
Current measurements indicate that we can expect to resolve up to 900 step heights within a single frame of data. If using a microscope objective lens, the smallest resolvable steps are about 10um, so that the maximum height range that can be imaged is about 900*10um = 9mm. If using a camera lens, then this 9mm range can be expanded to tens of meters, but the resolution size also scales in the same way. Thus, we can expect that a full distance range of 9 meters will mean that the smallest resolvable height step size becomes 9m/900 = 10cm.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
This year, I assembled a basic proof-of-concept system and performed a series of experiments. With these, I confirmed that I can generate an interference pattern at the focal plane when imaging different surface types. This validates the passive sensing approach. This was done using narrowband imaging, so the next step is to use a wider spectral band appropriate to the bandwidths of the snapshot imaging spectrometer (8~20nm per band). At the same time, I worked with a student to develop an active illumination -- this conventional approach makes it easier to get quantitative height measurements as an initial step towards adapting the method for passive sensing.
I have assembled the parts necessary for calibrating my lab's snapshot imaging spectrometer over the spectral range of this measurement, but this requires additional work to integrate software and algorithms, and so I plan to complete this work during the project's second year.
As a result of the coronavirus situation, I got a late start on research this year. However, in this coming year I will be working closely with a PhD graduate student on the project. Since we will be working together, I do not expect any serious difficulties with reaching my project goals.
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| 今後の研究の推進方策 |
My plan for the next two years is to continue assembling the full system and to measure the distance resolving power of the system (i.e. how many step heights can be resolved within the measurement range), the effect of different sample types (smooth vs. rough, light vs. dark) on measurement accuracy, the effect on depth measurement of different choices of lenses, and what is the best tradeoff between spatial resolution and spectral resolution.
By the end of this year, I plan to integrate my lab's snapshot imaging spectrometer with the existing interferometric imaging optics and start to take snapshot 3D measurements. In the final (third) year, I plan to work on maturing the technique and doing a number of experiments on dynamic scenes (such as using a camera lens to measure cars driving on the road, a macro lens to show a beetle walking across the ground, a microscope to show motion of tiny organisms). Since I also work on imaging through fog, I am curious to see how a 3D measurement system behaves in the case of fog.
Finally, I also plan to explore algorithmic approaches to expanding on the capabilities of the system. For example, by interpolating over the time domain of the video data, it should be possible to increase the distance resolving power of the system.
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| 次年度使用額が生じた理由 |
Kakenhi recommends that, as far as possible, recipients of research funds should try to use them to support students with research assistantships. Towards that goal, I plan to change my plan of expenses and use a large portion of my funds in the coming year towards funding a PhD student that has just joined my lab this year. This is a student who is not supported by a scholarship, but is an energetic and enthusiastic student.
While setting up experiments, there will be additional equipment that I will need to buy, but I've found so far that equipment costs are much less than I had anticipated, but the addition of personnel costs introduces a large unplanned expense. Together these more-or-less cancel out one another. I also plan to use funds for supporting conference travel and journal publication costs.
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