Viewing posts for the category Ultrasensitive Instrument Design

32-Channel IR Detector for Compressive Scanning Camera

A follow-on to the single channel version. This one had to work at very much lower power, which required a new amplifier topology based on local feedback around a very low noise JFET. This was a very fruitful development, which has been used in a number of follow-on designs.

Compressive-Scan Camera: 1-Channel IR Detector Analog Front End

In cooperation with InView Technology. Compressive scanning is a scheme for doing image sensing with a single-element detector, without suffering the N2 speed penalty of raster scanning. It's a sort of combination of scanning and image compression—you use a digital micromirror device (DMD) to multiply the image by a series of 1-bit digital basis functions, measure the resulting photocurrent, and then invert the transform to produce a compressed image. That's not too useful in the visible, where image sensors are cheap commodity items, but in the UV and especially the shortwave IR (SWIR), image arrays are extremely expensive, so there's a need for compressive scan cameras.

Current Amplifier for Nanopore Biochips for DNA Sequencing

Discussion on the topic here.

Instrumentation: Wideband Laser Noise Canceller

> 60 dB of laser RIN cancellation out to > 10 MHz, about 100 times faster than current commercial devices

Spectroscopic-Detection Biochips Based on Photonic Waveguides

Using POEMS to design waveguides, coupling structures, and optical/chemical interaction regions; consulting on microfabrication issues