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Test & Measurement White Papers
SWIR Camera Test – The New Swux Unit
SWIR imaging technology based on InGaAs sensor products has been a staple of scientific sensing for decades. Large earth observing satellites have used InGaAs imaging sensors for applications that have proven benefits in several markets. These very expensive early systems paved the way for smaller, faster and cheaper imaging for new commercial markets. As SWIR sensor testing proliferates, some basic level of performance needs to be defined, new test methods and units need to be developed, and...
Electrical-to-Optical and Optical-to-Electrical Converter Measurements
As fiber and free-space optical communication bandwidths increase, the need for very high speed optical modulators and detectors has also increased. The frequency response characterization of these electrical-to-optical (E/O, modulators sometimes...
Working in the Basement: Measuring Signals Below the Noise Floor with a Lock-In Amplifier
Measuring optical signals in the femtowatt (10-15) to nanowatt (10-9) range can be a daunting task. Signal levels this low are lost in typical detector noise levels and swamped by background light. The noise floor for photodiode detectors operated...
Beam Profiling: A Brief Review of Best Practices
Currently, lasers that vary widely in light wavelengths and beam powers are available for many scientific, industrial, and medical applications. This article reviews the components that comprise a laser beam profiler, and describes the methods of...
Gas Purging Keeps UV Spectrophotometers Healthy
Measuring in the far-UV (FUV) 120-220 nm presents unique challenges. The high energy that makes UV light interesting can cause photochemical formation of organic films on optical surfaces. These films cause increasing, wavelength-dependent loss of...
Daisy-chaining Data and Power to Reduce Cabling
Setting up motion control systems can be time consuming, costly, and complex. At Zaber, we focus on simplifying motion control. One way our systems can save you time and money is by reducing the number of cables required for a multi-axis system....
Noncircular in Perfection - Production Accompanying Measurement of an Asphere
Independent of the application, whether in satellite optics, video lenses or endoscopes - aspheres have already become indispensable in a wide range of highly versatile technical fields of application. Regardless of the system’s size, they all have...
A New Spectral Analysis System Designed to Measure High-Performance Thin-Film Optical Filters
The HELIX Spectral Analysis System was designed to address the limitations of most commercially available spectrophotometers when measuring high-performance thin-film optical filters. The system’s capabilities are four-fold: it is able to track...
Using Newport 1936-R/2936-R Power Meters for Low-Power, Pulsed or Modulated Light Sources
Recent advancements in photonics technologies have broadened their applications into many different areas. An increasingly larger number of complex and diverse forms of light sources are designed into various systems and experimental setups. These...
Autonomous automobiles don’t operate underwater, however…
Autonomous vehicles use an assortment of sensors and imagers including LiDAR (Light Detection and Ranging). Whether it’s scanning system, solid state, or flash these systems need to be calibrated for sensitivity over a dynamic range of light...
Reducing Production Waste with Laser Profiling and Characterization
A laser profiling system can characterize and identify which variables affect product quality and waste. But many laser users have never evaluated the quality of the beam beyond the initial delivery. This leads to frequent process adjustments to try...
Lateral-Effect Photodiodes
As the number of applications requiring mechanical alignment increases, the demand for new types of position-sensing detectors, specifically Lateral-effect PSDs is on the rise. These position sensors feature state of the art lateral technology to...
Laser Measurement Best Practices: How and When to Apply Measurements
There are many challenges that come with laser material processing. New tools can provide the means for more thorough application development, successful laser system integration, and can help to implement a more comprehensive laser maintenance...
Modal Launch Conditions - Measurement and Control
It has been known for many years that modal launch conditions have a major affect on the attenuation and bandwidth measured in multimode cabling systems. This white paper explores ways in which the international standards community has addressed...
When Smart Sensors Require Smart Sources
RGB sensors are calibrated to predict the indoor or outdoor ambient lighting conditions and are used to make appropriate corrections and trigger functions like auto adjusting display brightness. To do this effectively requires a smart calibration...
How Quantum Cryptography Works
Data security and data exchange are topics with increasing importance. How do you prevent data from being intercepted by a third party? The solution lies in cryptography: The message must be encoded. But what if the key exchange is intercepted? This...
Optical Design Tolerancing: A Key to Product Cost Reduction
The ideal optical system design minimizes production costs and meets performance requirements using achievable component and assembly tolerances and well-chosen post-assembly adjustments. Optical design software can help make this ideal manufactured...
See How Forensic Investigators Research Cases Using FLIR Thermal Cameras
Researchers have been looking for an alternative method of detecting the presence of dilute concentrations of blood on fabric. They have found a solution in thermal imaging with FLIR thermal imaging cameras. While blood is not visible on its own in...
Working with your benchtop spectrometer at high and low sample cuvette temperatures
Spectroscopy labs are home to spectrometers of varying types: UV-Vis-NIR absorbance, fluorescence, and circular dichroism, for example, all sitting on benches at room temperature. When a scientist wants to measure spectral properties of a sample at...
Optical Power Meter
An optical power meter measures the photon energy in the form of current or voltage from an optical detector. Newport’s 1936/2936-R Series Optical Power Meters are among the most versatile power meters in the market, and the electronics adapt to a...
Integrating Sphere Fundamentals and Applications
An integrating sphere collects electromagnetic radiation from a source completely external to the optical device, usually for the purpose of flux measurement or optical attenuation. Newport’s general purpose spheres (GPS) are designed as...
Infrared Camera Accuracy and Uncertainty in Plain Language
How accurate are thermal imaging cameras, and how are they calibrated? Understanding infrared camera accuracy and sensitivity can help clarify the value of well-calibrated thermal imaging cameras. In this paper, we use layman’s terms to explain how...
High Precision Lens Assembly with Alignment Turning Machines
In recent years, alignment turning technology has experienced some key developments. Progress has been made with regard to aspheres, cylindrical surfaces or "best fit" centration of lens groups. It has also been possible to significantly increase...
Measurement of Film Stacks in Cell Phones and Tablets Using White Light Interferometry
With the explosive growth of the tablet and smart phone market, equipment suppliers are developing more complex structures that include polarizers, LCDs, structured air gaps, and more. There are few systems that provide the measurement capabilities...
Fabricating and Testing Freeform Optics: Current Capabilities, Lessons Learned and Future Opportunities
Freeform optical shapes or optical surfaces that are designed with non-symmetric features are gaining popularity with lens designers and optical system integrators. A common question about freeform optics is, “If I design it, can you really make...
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April 2024
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