Quantifying lower tropospheric methane concentrations using GOSAT near-IR and TES thermal IR measurements

Tropospheric methane retrieved from ground-based near-IR solar absorption spectra

[1] High-resolution near-infrared solar absorption spectra recorded between 1977 and 1995 at the Kitt Peak National Solar Observatory are analyzed to retrieve column abundances of methane (CH4), hydrogen fluoride (HF), and oxygen (O2). Employing a stratospheric ‘‘slope equilibrium’’ relationship between CH4 and HF, the varying contribution of stratospheric CH4 to the total column is inferred. V...

Land Cover Characterization Using Multitemporal Red, Near-ir, and Thermal-ir Data from Noaa/avhrr

Thermal measurements of active semiconductor micro-structures acquired through the substrate using near IR thermoreflectance

Modern, high-density integrated circuits (IC) typically use a flip chip bonding technique to increase performance on a greater number of interconnects. In doing so, the active devices of the IC are hidden under the exposed substrate, which precludes the use of typical surface thermal characterization techniques. A near infrared thermoreflectance method is described such that the temperature of ...

A Combined Mid-IR/Near-IR Spectrometer

When analysts are faced with the decision of selecting either mid-IR (MIR) or near-IR (NIR) spectroscopy for materials characterization, the decision is usually based on the analytical, sampling, and/ or operational needs. For example, when the greatest analytical specificity is required or certain inorganic materials need to be measured, the choice favors MIR; whereas the need to keep an unsta...

Near-ir and Mid-ir Process Analysis — a Critical Comparison

Over the past several years, both near infrared (NIR) and mid infrared (MIR) spectroscopy have steadily gained acceptance as powerful methods for at-line and on-line analysis. These methods share the advantages of high speed, robust calibration, and low service requirements compared to more established process analytical techniques such as gas chromatography. However, despite their many similar...