Test and Measurement / Analysis Case Studies and White Papers

  1. Optical Profiling Of High Slope Surfaces

    Optical profilers using Coherence Scanning Interferometry (CSI) have traditionally found it a challenge to measure highly sloped surfaces. Surfaces like these can be found in all industries and include optical micro-lenses, brightness enhancing structures, and machined cones. ZYGO offers CSI based profilers running Mx™ software with advancements in signal detection and processing that vastly improve the ability to obtain valid topography data from surfaces with high slopes.

  2. High Power Industrial Laser Applications: New Solutions To Old Problems

    The advanced scalability, high beam quality, and wall-plug efficiency of fiber lasers in particular have made high-power lasers a common tool for commercial use. This paper discusses the concepts of proper monitoring and correctly defined laser parameters in industrial laser applications.

  3. Solving A Difficult Military Beam Alignment Task

    Laser systems used in the periscope of a nuclear-powered submarine providing on-board instrumentation that offers accurate pitch, yaw, and roll data. As a result of the critical nature of this information, the burden is placed on the quality of the laser beam, its size, its shape, and its intensity. 

  4. NIR Spectroscopy Unbound

    Near-infrared (NIR) spectroscopy covers the wavelength space between ultraviolet-visible and infrared absorbance. With enormous potential for a variety of applications, NIR spectroscopy is much more accessible due to the availability of compact, high-value NIR spectrometers. This application note provides a brief introduction to NIR spectroscopy, and introduces the breakthrough Flame-NIR spectrometer from Ocean Optics for handheld and portable applications requiring NIR and chemometric analysis. 

  5. Ultrasensitive emICCD Technology Enables High-Accuracy LIBS With Nanosecond And Picosecond Resolution

    One of the most convenient and efficient analytical techniques for trace elemental analysis is laser-induced breakdown spectroscopy (LIBS) as it requires little-to-no sample preparation and is easily performed in the lab or in the field. In LIBS applications where a relatively low power laser can be used, the less intense background continuum emission means a conventional CCD camera with a high-speed mechanical chopper affords a suitable imaging solution. For challenging applications where CCD and ICCD camera sensitivity and dynamic range are not enough, an emICCD camera is recommended. This application note presents data demonstrating the improved performance of a new emICCD camera from Princeton Instruments that delivers ultrahigh sensitivity for demanding LIBS applications on the nanosecond and picosecond timescales.

  6. The Art And Science Of Being Cool

    Spectroscopy and low-light imaging applications use sensitive silicon or InGaAs based scientific detectors that require deep-cooling technologies for minimizing thermally generated dark noise. Ideally, photonic detectors should provide a signal-to-noise ratio (SNR) that is limited only by photon shot noise, however, it is also lowered in practice by dark noise and read noise. This technical note discusses the benefit of using liquid-nitrogen–based cryogenic cooling technologies to chill sensors beyond -100°C and deliver the lowest levels of dark noise achievable.

  7. NIR Spectroscopy Aids In The Diagnosis Of Neonatal Brain Injury

    An extensive set of spectroscopy-based methods have been developed over the past few years in order to facilitate more rapid and accurate detection and diagnosis of disease and injury. A British research group has recently designed and tested an NIRS system to assist in the diagnosis of neonatal brain injury. This new system measures the changes in tissue oxygenation and hemodynamics by estimating the changes in hemoglobin concentration. This application note presents a study on the diagnosis of neonatal brain injury through the use of CYRIL and quantitative near-infrared spectroscopy.

  8. Choosing The Most Suitable Laser Wavelength For Your Raman Application

    Over the years, dispersive Raman spectroscopy has increasingly been implemented for material identification due to its portability and sampling flexibility. When choosing a Raman instrument, one of the primary concerns is the wavelength of the laser that is integrated into the Raman spectrometer system. Even though the Raman shift of any material is only related to the material’s specific chemical structure and is independent of the excitation wavelength, different wavelengths have their specific strengths and weaknesses. So how does one select a laser excitation wavelength for specific applications?