# Tag Archives: measurement approach

## Laser Slope Efficiency and Curve Fitting

Introduction I have spent much of my summer dealing with issues related to the high temperature characteristics of lasers. These issues have stirred within me an interest in laser slope efficiency .  Slope efficiency, also known as SE,  is simply … Continue reading

Posted in Electronics, Fiber Optics | Tagged | 1 Comment

## Laser Tracking Error and Curve Fitting

Introduction I had a request for an example of how the output power of a laser varies with temperature. We call this parameter tracking error. Tracking error varies from part to part and the manufacturers simply put a bound on … Continue reading

## Lighting My House Number and Designing with Phototransistors

Introduction I have had several people say that my house number is difficult to read at night. The number consists of four digits mounted on a structural column that holds up a section of my roof. In response to these … Continue reading

Posted in Construction, Electronics | Tagged | 5 Comments

## Yet Another Circuit with a “Logarithmic” Characteristic

Introduction While I was looking for different circuits that generate a logarithmic characteristic (voltage, current, or resistance), I stumbled upon a web page that discussed a logarithmic potentiometer approximation using a linear potentiometer with one or two resistors connected to … Continue reading

Posted in Electronics | Tagged | 1 Comment

## Another Circuit with a “Logarithmic” Characteristic

Introduction Electronics is my profession and my hobby (along with mathematics). For a hobbyist project of mine, I need an amplifier circuit with a programmable gain that varies exponentially with the setting on a potentiometer. When I design a circuit, … Continue reading

Posted in Electronics | Tagged | 6 Comments

## Interesting Ratiometric Temperature Measurement Approach

Introduction As you can tell, I enjoy interfacing to sensors. Today, I was reading the usual assortment of engineering trade journals when I came across an interesting part from Lapis Semiconductor that is worth discussing here. It uses simple digital … Continue reading