Near-infrared and infrared certification standards and other optical standards are used to validate infrared spectroscopy instruments. Middleton Spectral Vision offers several certified optical standards and performs recertifications.
Extended range near-infrared wavelength standards are used to validate the wavelength scale of near-infrared instruments. The standards are made with four components, three rare earth oxides and talc, to cover the whole region from 1000 nm to 2500 nm. The standards are sealed and traceable to NIST SRM 1920a standards. Different sizes allow use with numerous spectroscopic instruments.
In order to measure reflectance with a UV-Visible or a Near-Infrared instrument, or hyperspectral camera, the instruments need to be calibrated with materials that have the highest possible reflectance. Diffuse gold in 1 inch and 1.75 inch diameters could be used in conjunction with the same size Middleton Spectral Vision wavelength standards.
High reflectivity PTFE is an industry standard. Middleton Spectral Vision produces PTFE reflective materials that are fully comparable with the best available reflectance standards in both the near-infrared and ultraviolet-visible regions, and they can be manufactured in different shapes and sizes.
Infrared specular reflectance measurements are related to highly reflective reference materials, such as evaporated gold. Thin gold coatings, however, may change with use over time, and furthermore, the reflectance cannot be assumed to be close to the ideal 100 percent, even when the gold surface is freshly created. The Middleton Spectral Vision MRC-910-3200 Specular Reflectance Standard has known and tabulated reflectance values, and thus can be used to normalize the reflectance measurements of unknown surfaces. The Infrared Specular Reflectance Standard is stable over time, thus it can assure the long-term stability and comparability of such measurements.
For measurements in regulated industries, Attenuated Total Reflectance (ATR) accessories need to be validated periodically. The Middleton Spectral Vision MRC-910-ATR Validation Standards serve to test the functioning and reproducibility of ATR accessories and systems, without contaminating the ATR crystal surface.
Diffuse reflectance optical arrangement is used often in the mid-infrared wavelength region to measure the reflectance spectra of powders, films and other samples. Middleton Spectral Vision developed a NIST Traceable Diffuse Reflectance Wavelength Standard that has well identified sharp bands throughout the whole mid-infrared region. FTIR accessories, manufactured by FTIR spectrometer or infrared accessory manufacturers can be validated using this traceable standard.
Traceable linearity standards are used to calibrate spectrophotometers in regulated industries. They can be used to make corrections to the photometric scale. The set of standards consists of 4, 6, or 8 diffuse reflective disks with reflectance values ranging from approximately 99% to 2% and have calibrated spectra in the NIR wavelength region. The disks are sealed and contain a blend of polytetrafluoroethylene and charcoal powders. The certification package includes a table of values, certificate, and spectra. The standards are delivered in a protective wooden case.
Many standards must be recertified periodically to comply with regulatory requirements. Recertification is a cost-effective way of extending the life of a standard. Middleton Spectral Vision performs this service expeditiously to minimize your down time. Should you already have a standard from Middleton Spectral Vision or its predecessor company, Kemeny Associates, please contact us for recertification.
Samples such as gels or other substances as viscous as chocolate syrup or ketchup are very difficult to measure with near-infrared equipment. Thin flow-through cells exhibit resistance to pumping fluids containing high levels of particulate matter. Some liquids may even separate under the pumping conditions.
Middleton Spectral Vision has developed a Transflectance Liquid Cell sampling device for near-infrared analyzers. The cell is easy to open, close, and clean, and it has a calibrated, reproducible 0.3 to 0.5 mm optical pathlength (the physical film thickness is half of the optical path).
For samples of even greater density, the Transflectance Paste Cell will allow the measurement of samples previously thought to be too viscous to measure. Like the liquid cell, the paste cell allows for easy application and cleaning as well as a repeatable pathlength.
For more information, please download the product sheets or contact us.
|Spectroscopy Accessories Ordering Information|
|MRC-910-1920x||1920x Extended Range Near-Infrared Wavelength Standard, 2" outer diameter, 23mm diameter optical area|
|MRC-910-1920x-40||1920x Extended Range Near-Infrared Wavelength Standard, 2.25" outer diameter, 42mm diameter optical area|
|MRC-910-G25||Diffuse Gold Reference, 2" diameter holder without window|
|MRC-910-GW||Diffuse Gold Reference, 2" diameter holder with window|
|MRC-910-G40||Diffuse Gold Reference 2.25" diameter holder without window|
|MRC-910-W38||White Reference Standard UV-VIS-NIR, 36mm diameter, 2.25" housing|
|MRC-910-W25||White Reference Standard UV-VIS-NIR, 23mm diameter, 2" housing|
|MRC-910-WSQ||White Reference Standard UV-VIS-NIR, 2" square housing|
|MRC-910-WSQ3||White Reference Standard UV-VIS-NIR, 3" square material, no housing, no case|
|MRC-910-3200||Infrared Specular Reference|
|MRC-910-ATR+V||ATR Validation Standard with Validation Package|
|MRC-910-ATR||ATR Validation Standard|
|MRC-910-1921GW||Mid-Infrared Diffuse Reflectance Wavelength Standard|
|MRC-910-LIN4||Sealed Linearity Standard Set (white, 40%, 10% , dark) - round 38mm clear diameter|
|MRC-910-LIN6||Sealed Linearity Standard Set (white, 80%, 40%, 20%, 10%, dark)|
|MRC-910-LIN8||Sealed Linearity Standard Set (white, 80%, 60%, 40%, 20%, 10%, 5%, dark) - 42mm diameter optical area|
|MRC-910-HSI-VAL||Near-Infrared Linearity and Wavelength Standard Kit (white, 40%, 10%, dark, 1920x-40)|
|MRC-912-000||Transflectance Liquid Cell|
|MRC-912-001||Flowthrough Transflectance Liquid Cell|
|MRC-912-005||Transflectance Paste Cell|
Middleton Spectral Vision also performs recertifications of the optical standards.
Our scientists and engineers are available to help you understand how spectral imaging technologies might be appropriate for your application or to help you identify the specific components that best help to accomplish your goals. Call us!
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