Using Microcontrollers for High Accuracy Analogue Measurements

High accuracy polarization measurements using binary polarization rotators.

We report a novel system for the accurate measurement of all polarization related parameters, including polarization mode dispersion and polarization dependent loss, using binary magneto-optic polarization rotators. By taking advantage of the binary nature of the rotators, we achieved unprecedented DGD, SOPMD, and PDL accuracies of 2.6 fs, 1.39ps(2), and 0.06 dB respectively; repeatabilities of...

High accuracy dual lens transmittance measurements.

We show how to determine the transmittance of short focal length lenses (f approximately 19 mm and f approximately 2 5 mm, in this case) with a combined uncertainty of 3 parts in 10(4) or better by measuring transmittances of lens pairs of a set of three or more lenses with the same nominal focal length. Uncertainties are minimized by optimizing the radiometric design of the setup and the measu...

Narrow Line Rubidium Magnetometer for High Accuracy Field Measurements

Observations of Zeeman tansitions in Rb87 vapor can be used to make accurate measurements of the earth's magnetic field provided that the resonance lines are narrow enough so that the separate components of the transitions are resolved. However, the resulting relatively low signal-to-noise ratio makes it difficult to follow rapid chages in the field. Self-oscillating magnetometers have rapid re...

Sound Generation Using Fujitsu Microcontrollers

How to improve ADC accuracy when using STM32F2xx and STM32F4xx microcontrollers

Introduction The purpose of this application note is to show how to improve the accuracy of A/D conversions for applications using the STM32F2xx and STM32F4xx microcontrollers. It also explains the firmware methodology, which can be applied to reduce the ADC error and gives some general tips on writing firmware for better ADC accuracy. Please note that the data provided with this application no...