A study on the applicability of invisible environment of surface image velocimeter using far infrared camera

Inhyuk Bae; Kwonkyu Yu; Byungman Yoon; Seojun Kim

doi:10.3741/JKWRA.2017.50.9.597

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A study on the applicability of invisible environment of surface image velocimeter using far infrared camera 원적외선 카메라를 이용한 표면영상유속계의 비가시 환경 적용성 검토

30 September 2017. pp. 597-607

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Abstract

In this study, the applicability of the surface image velocimeter using the far-infrared camera was examined in order to solve the application problem of the measurement in night time, which has been pointed out in previous studies as the limit of the surface image velocimeter. For this purpose, the accuracy evaluation of measurement of the far-infrared camera was conducted for two conditions. Accuracy was evaluated by calculating the relative error of the results of the measurements of surface image velocimeter using the normal video camera during the daytime that was already verified. As a result, the relative error of the surface velocimeter using the far infrared camera was 4.3% at maximum, the average error was about 1%, and the error of the fog condition was maximum 5.2% with an average of 2%. In conclusion, it is possible to measure with high accuracy when using far-infrared camera in a invisible environments where the water flow can not be visualized with a general camera.

Keywords

SIV

FIR-SIV

Far-infrared ray

Surface velocity

Invisible environment

Night-time measurement

본 연구에서는 표면영상유속계의 한계점으로 지적되어 온 야간이나 안개시 적용 문제를 해결하기 위해, 원적외선 카메라를 이용한 표면영상유 속계의 적용성을 검토하였다. 이를 위해 각 조건에 대한 원적외선 카메라의 측정 정확도 평가 실험을 진행하였다. 정확도 평가는 기존에 검증이 된 주간 조건의 일반카메라를 이용한 표면영상유속계 측정 결과에 대한 상대 오차를 산정하여 평가하였다. 결과적으로 원적외선 카메라를 이용한 표 면영상유속계의 야간 측정 상대 오차는 최대 4.3%, 평균 1% 내외로 매우 낮게 나타나 정확도가 높음을 확인하였고, 안개 조건 또한 최대 5.2%, 평균 2% 내외로 매우 높은 정확도를 보였다. 이에 따라 일반 카메라로 수면 흐름을 가시화할 수 없던 비가시 환경에서 원적외선 카메라를 이용하 는 경우 높은 정확도로 측정이 가능할 것으로 판단된다.

키워드

SIV

FIR-SIV

원적외선

표면 유속

비가시 환경

야간 측정

References

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 50
No :9
Pages :597-607
Received Date : 2017-06-05
Revised Date : 2017-07-18
Accepted Date : 2017-07-18
DOI :https://doi.org/10.3741/JKWRA.2017.50.9.597

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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