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Photonic sensors based on flexible materials with FBGs for use on biomedical ap...

This chapter is intended for presenting biomedical applications of FBGs embedded into flexible carriers for enhancing the sensitivity and to provide interference-free instrumentation.

Microlenses for stereoscopic image formation

This paper presents microlenses for integration on a stereoscopic image sensor in CMOS technology for use in biomedical devices. It is intended to provide an image sensor with a stereoscopic vision. An array of microlenses potentiates stereoscopic vision and maximizes the color fidelity. An array of optical filters tuned at the primary colors will enable a multicolor usage. The material selected for fabricating...

Polichromatic image sensor with microlenses for stereoscopic acquisition

This paper presents the fabrication of microlenses for integration on a stereoscopic image sensor in CMOS technology and a low-cost technology for fabricating optical filters arrays tuned for the primary colors. The material selected for fabricating the microlens was the AZ4562 positive photoresist and the fabrication process explained. Moreover, the fabrication process presented in this paper is for directly p...

Fabrication methodology of microlenses for stereoscopic imagers using standard ...

This paper presents the fabrication technology of microlenses maintaining a high reproducibility of their characteristics with low cost. The objective of microlenses is to be integrated into imagers in CMOS technology to allow stereoscopic vision. The fabricated microlenses form cylindrical arrays to be placed above the optical filters and photodetectors, in order to potentiate stereoscopic vision and at the sa...

Microlenses array made with AZ4562 photoresist for stereoscopic acquisition

In this paper is presented a fabrication process for obtaining refractive microlenses arrays with high reproducibility and low cost. This process was specifically optimized for the AZ4562 photoresist. Functional prototypes of microlenses arrays with dimensions in the range of 30 m, 4.9 mm and 5 m for width, length and thickness, respectively, were fabricated and tested. The pre-thermal reflow spacing between ...

Fabrication of AZ4562 refractive microlenses array for light enhancement on opt...

This paper presents the fabrication of an array of high aspect ratio photoresist based refractive microlenses (ML) using photolithography and thermal reflow. First, and in order to evaluate and predict the MLs optical properties and physical dimensions, finite element analysis was done. These simulations helped to design the super high resolution chrome on soda lime glass photomask as well as the parameters for...

Optical techniques for defect evaluation in vehicles

Super-regenerative receiver at 433MHz

This paper presents a receiver for operation in the 433 MHz ISM band. The selected architecture explores the super regeneration phenomena to achieve a high sensitivity for applying in wireless implantable microsystems. This radio frequency (RF) chip can be supplied with a voltage of only 3 V for demodulating signals with powers in the range [ 100, 40] dB. The codulation (modulation and coding) scheme of the bi...

RF CMOS transceiver at 2.4 GHz in wearables for measuring the cardio-respirator...

This paper presents a radio-frequency (RF) transceiver for operation in the 2.4 GHz ISM band. The RF CMOS transceiver can be supplied with only 1.8 V, and it was designed to establish wireless links for distances up to 10 m, for a maximum baud-rate of 250 Kbps with a Bit Error Probability less than 10 6. The transmitter can deliver a output power of 0 dBm with a consumption of only 11.2 mW, while the receiver h...

A low-power/low-voltage CMOS wireless interface at 5.7 GHz with dry electrodes ...

This paper describes a low-power/low-voltage CMOS wireless interface (CMOS-WiI) at 5.7 GHz with dry electrodes for congnitive networks. The electrodes are 4 x 4 microtip arrays and acquire electroencephalogram (EEG) signals in key- points for processing. The CMOS-WiI was fabricated in a UMC 0.18 µm RF CMOS process and its total power consumption is 23mW with a voltage-supply of only 1.5 V. The carrier frequency...