## Understanding the Paraxial Gaussian Beam Formula

##### Yosuke Mizuyama September 21, 2016

The Gaussian beam is recognized as one of the most useful light sources. To describe the Gaussian beam, there is a mathematical formula called the paraxial Gaussian beam formula. Today, we’ll learn about this formula, including its limitations, by using the Electromagnetic Waves, Frequency Domain interface in the COMSOL Multiphysics® software. We’ll also provide further detail into a potential cause of error when utilizing this formula. In a later blog post, we’ll provide solutions to the limitations discussed here.

### Study the Design of a Polarizing Beam Splitter with an App

##### Abbie Weingaertner September 12, 2016

Polarizing beam splitters are optical devices used to split a single light beam into two beams of varying linear polarizations. These devices are useful for splitting high-intensity light beams like lasers as, unlike absorptive polarizers, they do not absorb or dissipate the energy of the rejected polarization state. See why creating a numerical modeling app offers a more efficient approach to analyzing and optimizing the design of these devices.

### Benchmark Shows Valid Results for a Piezoelectric Transducer Design

##### Bridget Cunningham September 7, 2016

Many modern devices leverage piezoelectricity. When analyzing the design of such devices, you want to be confident in the reliability of the obtained results. By utilizing the COMSOL Multiphysics® simulation software, you can achieve accurate results quickly. To prove it to you, we have created a benchmark model of a piezoelectric transducer.

### ABB Minimizes Transformer Hum with Simulation

##### Bridget Paulus August 9, 2016

We rely on power transformers for everyday tasks, but these devices also create a loud buzzing or humming noise. This sound comes from vibrations in different parts of the transformer and is impossible to eliminate completely. To reduce the noise, a team of engineers at ABB Corporate Research Center simulated the acoustic, electromagnetic, and mechanical behavior in their transformer systems with the COMSOL Multiphysics® software.

### Autonomous Vehicles: Putting Technology in the Driver’s Seat

##### Bridget Paulus August 8, 2016

Imagine a vehicle where you could simply plug in a destination and arrive without ever having to touch the steering wheel. Fully autonomous cars would revolutionize society, benefiting those who already drive and increasing the mobility of those who can’t. While technological advancements have brought us closer to such a reality, there are still many challenges to overcome. Today, we’ll explore the future of autonomous cars and what needs to happen before they can become a viable option.

### Evaluating Microphones and Transducers with Simulation

##### Aditi Karandikar August 2, 2016

Acoustic measurements aren’t always accurate due to imperfections in the measurement tools. To limit incorrect results, devices, such as microphones and vibration transducers, have standards that define their allowable margin of error. Meeting these standards is required, but good measurement tools go a step further and keep their error range consistent over time. To create quality devices, research teams at Brüel & Kjær use multiphysics simulation to model their microphone and transducer designs.

### Particle Tracing in a Component of a Quadrupole Mass Spectrometer

##### Caty Fairclough July 25, 2016

Quadrupole mass filters, the key component of quadrupole mass spectrometers, filter ions by their charge-to-mass ratio, only allowing ions with a certain ratio to pass through the device. As such, a high transmission probability for a specific ion through the filter is desirable. However, fringe fields in the mass filter can affect this probability. By using multiphysics simulation, we can take a closer look at quadrupole mass filters and investigate the effect of fringe fields on these devices.

### Evaluating an Insulin Micropump Design for Treating Diabetes

##### Bridget Cunningham July 21, 2016

In any form of treatment, it is always desirable to minimize the level of discomfort that the treatment process causes patients, while ensuring overall safety and effectiveness. For diabetes patients, insulin injections remain an important form of treatment, but the process itself can be painful. With the help of multiphysics simulation, a team of researchers from the University of Ontario Institute of Technology sought to develop a MEMS-based micropump that could administer insulin injections in a safe and painless way.

### Analyzing the Design of a Thermoelectric Device for Cryotherapy

##### Bridget Cunningham July 20, 2016

Cryogenic techniques are used to treat a wide range of cosmetic dermatological problems as well as remove internal tumors and other damaged tissue. Shifting from the typical nitrogen-based approach, researchers at the University of Birmingham in the U.K. sought to investigate the potential of using a thermoelectric cooler, or Peltier device, to cool a cryogenic probe. Here’s a look at how COMSOL Multiphysics provided them with the tools to do so.

### Do Bumblebees Use Their Hairs or Antennae for Electroreception?

##### Caty Fairclough July 19, 2016

While bumblebees are not a complete mystery, we still have a lot more to learn about these helpful insects. A topic with a lot of buzz surrounding it is how they find food. Using electroreception, an ability most often found in aquatic animals, is one possibility. But how do bumblebees use electroreception? To find answers, a research team at the University of Bristol combined the power of physical experiments and simulation.

### How to Analyze an Induction Motor: A TEAM Benchmark Model

##### Nirmal Paudel July 18, 2016

In this blog post, we work through the three-phase induction motor described in Testing Electromagnetic Analysis Methods (TEAM) workshop problem 30a. We analyze the induction motor in 2D using the transient solver in the Rotating Machinery, Magnetic interface. We investigate the motor’s start-up dynamics by coupling the electromagnetic analysis with the rotor dynamics, including the inertial effects. At the end, we compare the benchmark model’s results with those from the COMSOL Multiphysics simulation.