Development of High-range-resolution Time-of-Flight range Image Sensors
| Project/Area Number |
15H05524
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Electron device/Electronic equipment
|
|---|
| Research Institution | Shizuoka University |
|---|
Principal Investigator |
Yasutomi Keita 静岡大学, 電子工学研究所, 助教 (50621661)
|
|---|
| Research Collaborator |
KAWAHITO shoji
|
|---|
| Project Period (FY) |
2015-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥23,270,000 (Direct Cost: ¥17,900,000、Indirect Cost: ¥5,370,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2016: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
|
|---|
| Keywords | Time-of-Flight / ３次元計測 / CMOSイメージセンサ / 距離計測 / 時間分解撮像 / 距離撮像素子 / 3次元計測 / ロックインピクセル / イメージセンサ / 三次元計測 / 撮像素子 |
|---|
| Outline of Final Research Achievements |
A time-of-flight range CMOS image sensor with sub-100-um range resolution has been developed. By using a lateral electric charge modulation, a three-tap lock-in pixel with photocurrent response of several hundred picoseconds have been developed. To suppress the low-frequency jitter in the light trigger that limits the range resolution, we have developed a novel technique using reference plane sampling (RPS) with a reference pixel array embedded in the same focal plane of the main pixel array. This technique improves the range resolution significantly. To reduce the clock skew of the gating clocks, a column-parallel digital delay-locked loop (DLL) with a dual clock tree is implemented with a short calibration time of approximately 42 us.
The prototype range imager with 192 x 4 effective pixels is implemented in a 0.11-um CMOS image sensor technology. Using the RPS, a range resolution of 64 um has been achieved, corresponding to a 430-fs time resolution with a 25-mm range.
|
| Academic Significance and Societal Importance of the Research Achievements |
従来のTOF距離撮像では、数ミリメートルの距離分解能（時間にして数１０ピコ秒）しか得られておらず、その用途は「認識」用途に限られる。本研究により、100マイクロメートル以下の距離計測が可能であることが実証され、３次元スキャナなどの計測分野にも応用できる可能性が示された。また、イメージセンサ内のジッタを低減することにより、さらなる高距離分解能化も期待でき、TOF距離撮像素子の新たな応用展開が期待できる。また、要素技術として高速なロックイン検出が可能な複数出力の電荷変調素子や、スキューを短時間で補正できる全電子式スキュー補正回路も実証しており、他の時間分解撮像にも有用な技術を確立した。
|
Report
(5 results)
Research Products
(23 results)
