Measure Laser Power With A Modified MEMS Pressure Sensor

By J. Jayapandian, September 19, 2011

Laser power is usually measured with a thermocouple/thermopile or with photo diodes. But thermopile-based laser power meters depend on the heat the laser generates in the sensor and are usually bulky with a slow response time.

Measure Micro-Displacements Using A CD’s Optical Pickup Head

By Usharani Ravi, May 05, 2010

Micro-Structured Transducer Accurately Measures Pressure

By K. Prabakar, December 11, 2008

Today’s micro- and nano-structured sensors boast excellent linearity, resolution, and wide measurement ranges. As a result, microelectromechanical systems (MEMS) are playing an increasing role in many more applications. This design describes a

LPT Port Drives Programmable Slewing-Voltage Control

By J. Jayapandian, February 17, 2005

This design modifies a simple first-order, low-pass filter into a slewing-voltage control that is programmable for its slope and amplitude through a PC's LPT port. These control parameters are typically required for metallurgy studies like corrosion o

Novel PC-Compatible AC Power Controller Uses Solid-State Relay

By J. Jayapandian, September 15, 2003

This design describes a simple, cost-effective solution for an ac power controller using PC-compatible conduction-angle control. A solid-state relay (SSR) is activated through a pulse-width-modulated (PWM) transistor-transistor-logic (TTL) timing...

Interface 20-Bit Sigma-Delta ADCs Through A PC's Parallel Port

By J. Jayapandian, March 04, 2002

In most sigma-delta analog-to-digital converter (ADC) applications, the serial data transfer occurs through a serial port. A microcontroller configures the serial port as required—setting the baud rate and stop/start bits, initializing the serial...