The design of a single integrated lock-in pixel with a logarithmic response for a modulated light camera is described. The sensor has been designed to detect low light levels and can detect modulated light with frequency well above 2 MHz. An n-well photodiode, amplifier, mixer and ISO Hz low-pass filter have been implemented to allow continuous processing of the incident light. The performance of the sensor is demonstrated using an optoacoustic imaging system and tissue phantoms. A 1MHz ultrasound transducer is used to modulate light scattered though a tissue phantom. An absorbing sphere is scanned through the medium and the improvement in imaging performance provided by ultrasound modulation is demonstrated.
|Number of pages||6|
|Journal||Progress in Biomedical Optics and Imaging - Proceedings of SPIE|
|Publication status||Published - 1 Dec 2004|
|Event||ALT'03 International Conference on Advanced Laser Technologies: Biomedical Optics - Silsoe, United Kingdom|
Duration: 19 Sep 2003 → 23 Sep 2003
ASJC Scopus subject areas