Exposure Time Control Method for Higher Intermediate Frequency in Optical Heterodyne Imaging and Its Application to Electric-Field Imaging Based on Electro-Optic Effect-Reference-Cited by-同舟云学术

Exposure Time Control Method for Higher Intermediate Frequency in Optical Heterodyne Imaging and Its Application to Electric-Field Imaging Based on Electro-Optic Effect

Published:2024-02-15 Issue:4 Volume:24 Page:1249
ISSN:1424-8220
Container-title:Sensors
language:en
Short-container-title:Sensors

Author:

Sasagawa Kiyotaka¹^ORCID,Okada Ryoma¹^ORCID,Akamatsu Yoshihiro¹,Mizuno Maya²,Takehara Hironari¹^ORCID,Haruta Makito¹³^ORCID,Tashiro Hiroyuki¹⁴^ORCID,Ohta Jun¹^ORCID

Affiliation:

1. Division of Materials Science, Graduate School of Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192 Japan

2. Radio Research Institute, National Institute of Information and Communications Technology, 4-2-1, Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan

3. Department of Opto-Electronic System Engineering, Chitose Institute of Science and Technology, 758-65 Bibi, Chitose, Hokkaido 066-8655, Japan

4. Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

Abstract

We propose and demonstrate a method for equivalent time sampling using image sensors to selectively detect only the target frequency. Shortening the exposure time of the image sensor and using equivalent time sampling allows for the detection of frequency components that are higher than the frame rate. However, the imaging system in our previous work was also sensitive to the frequency component at 1/4 of the frame rate. In this study, we control the phase relationship between the exposure time and observed signal by inserting an additional interval once every four frames to detect the target frequency selectively. With this technique, we conducted electric field imaging based on the electro-optic effect under high noise conditions in the low-frequency band to which the conventional method is sensitive. The results demonstrated that the proposed method improved the signal-to-noise ratio.

Funder

Ministry of Internal Affairs and Communications of Japan

Publisher

MDPI AG

Link

https://www.mdpi.com/1424-8220/24/4/1249/pdf

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