Transmittance Standards

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Contact Art Springsteen: Email or (603)526-2420


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Contact Kathy Springsteen: Email or (603)526-2420

 

Avian Technologies offers a wide variety of materials on both a standard and custom basis. Standard products include:

Neutral Density Transmittance Filter Sets

Neutral density filters are useful in the calibration of photometric, spectrophotometric, or radiometric systems. Calibrated filters are used to assess the dynamic range of detectors and optical systems. A set lf transmittance standards offers a convenient way of checking the performance of any spectrophotometer.

General Information above Avian Technologies Filters.

We offer three types of filters

  • Schott Glass (TFS-NDG)
  • Metal (Inconel) on Glass (TFS-ND)
  • Metal on Quartz (TFS-NDU)

Our filters are aged in an oxidizing atmosphere to aid in long-term stability. Filters are available in two formats

  • 2 square
  • Standard 10mm cuvettes, canted to eliminate inter-reflection error

Filter sets are calibrated traceable to NRC/NIST

All filters sets come boxed

Wavelength calibration filters (in section below) can be purchased separately in the same formats as the sets

Stock sets are listed below. Custom sets and single filters are also available. Please contact us if interested.

Recommended For Part # Description
UV-Vis Range
250-800nm
TFS-NDU-03-cuv Three neutral density filters, cuvette format, nominal transmittance of 0.3, 0.5, and 1.0A, Calibrated 250-700nm. with tabular data at 10nm intervals and digital data on CD at 1 nm intervals.
UV-Vis Range
250-800nm
TFS-NDU-04-cuv Four neutral density filters, cuvette format, nominal transmittance of 0.04, 0.3, 0.5, and 1.0A. Calibrated 250-700nm, with tabular data at 10nm intervals and digital data on CD at 1 nm intervals.
UV-Vis Range
250-800nm
TFS-NDU-03-02 Three neutral density filters, nominal transmittance of 0.3, 0.5, and 1.0 A, calibrated 250-700 nm with tabular data at 10nm intervals and digital data on CD at 1 nm intervals. Filter size 2" x 2" (thickness varies by density).
Vis/Color Range
360-830 nm
(up to 1100 nm)
TFS-NDG-06-02 Six neutral density filters, calibrated over the range of 360-780nm (CIE color range) with tabular data at 10nm intervals and digital data on CD at 1 nm intervals. Nominal densities of 0.1, 0.3, 0.5, 0.6, 1.0, and 2.0 OD. Filter size 2" x 2" (thickness varies by density).
Vis/Color Range
360-830 nm
(up to 1100 nm)
TFS-NDG-03-02 Three neutral density filters, calibrated over the range of 360-780nm (CIE color range) with tabular data at 10nm intervals and digital data on CD at 1 nm intervals. Nominal densities of 0.3, 0.5, 1.0 OD. Filter size 2" x 2" (thickness varies by density).
Vis-NIR Range
360 (400)-2200nm
TFS-ND-06-02 Six neutral density filters, calibrated from 400-2000nm tabular data at 20 nm intervals and digital data on CD at 1 nm intervals. Nominal densities are 0.03, 0.1, 0.3, 0.5, 1.0, and 2.0 OD. Filter size 2" x 2" x 2.0 mm
Vis-NIR Range
360 (400)-2200nm
TFS-ND-03-cuv Three neutral density filters, calibrated from 400-2000nm tabular data at 20 nm intervals and digital data on CD at 1 nm intervals. Nominal densities are 0.3, 0.5, 1.0 OD. Cuvette format.
Vis-NIR Range
360 (400)-2200nm
TFS-ND-06-cuv Six neutral density filters, calibrated from 400-2000nm tabular data at 20 nm intervals and digital data on CD at 1 nm intervals. Nominal densities are 0.03, 0.1, 0.3, 0.5, 1.0, and 2.0 OD. Cuvette format.

Filters in the above sets can be purchased individually. Please request TF-ND-##, TF-NDG-## or TF-NDU-## where ## is the nominal absorbance of the filter x 10.

Transmittance Standards — Mid-Infrared

The National Physical Laboratory (UK), The National Research Council Canada, and NIST have described a transfer standard for mid-infrared transmittance. This standard is a Schott neutral density glass that is calibrated for transmittance at seven points in the mid-IR between 4000 cm -1 and 2000 cm -1.

Avian Technologies MIR transmittance standard includes the filter, a standard filter holder that fits all dispersive and Fourier transform infra red spectrometers and calibration (traceable to NRC) at all seven points, along with a transmittance curve. Instructions on the use of the standard are provided.

transmit

 

Part #

TS-MIR-015

 

Transmittance Wavelength Calibration Standards

Rare earth oxide glass filters are for calibration of spectrophotometers in the UV-Vis-NIR range. Avian Technologies currently offers three filters; holmium oxide and didymium oxide glasses, plus the new multiple oxide filter WCT-2065. All three filters have peaks useable in the UV-Vis-NIR, although didymium oxide is usually used in the visible region of the spectrum, while holmium oxide and WCT-2065 are used over the entire UV-Vis-NIR range.

Avian Technologies, working in conjunction with the Analytical Chemistry Division of NIST, has released a new wavelength calibration standard for the Vis-NIR spectral range.

WCT-2065 Wavelength calibration Standard

The transmittance version of the standard, designated at WCT-2065, is the equivalent of NIST SRM-2065. The filter is currently available in 20 mm and 25.4 mm diameter configurations. This standard is extremely useful in the calibration of NIR spectrophotometers, both dispersive and Fourier transform, in the 400-2200 nm wavelength range. The filter material is glass made with a combination of rare earth oxides, including holmium oxide, samarium oxide, ytterbium oxide, and neodymium oxide in a base glass containing oxides of lanthanum, boron, silicon, and zirconium.

The reflectance version of the standard, designated WCR-2066, is the equivalent of NIST SRM-206. The standard is ideal for calibration of the wavelength scale of both scanning and Fourier transform near-infrared spectrometers used in the reflectance configuration. The standard consists of a 1.0” diameter WCT-2065 filter backed with Avian Technologies Fluorilon™ FW-99 diffuse reflectance material, in a black anodized aluminum holder designed to fit most spectrometers. This standard is useable in the 320-2200 nm range.


wct2065

Pertinent references:

Wavelength Standards for the Near-Infrared Spectral Region

Standard Reference Material 2036 Near-Infrared Reflection Wavelength Standard, Steven J. Choquette, David L. Duewer, Leonard M. Hanssen, and Edward A. Early, Applied Spectroscopy, Vol. 59, Issue 4, pp. 496-504

Holmium Oxide Filters

holium

Part #

Description

WCT-HO-CUV Holmium oxide filter, in standard 10 mm cuvette format. Calibration traceable to National Research Council Canada. UV-Vis-VNIR.
WCT-HO-02c 2" Holmium oxide filter, Calibration traceable to National Research Council Canada. UV-Vis-NIR.

Didymium Oxide Filters

Part #

Description

WCT-DD-02 2" square Didymium oxide filter, 5 mm thick. Calibration traceable to National Research Council Canada. UV-Vis-NIR.
WCT-DD-CUV Didymium oxide filter, in standard 10 mm cuvette format. Calibration traceable to National Research Council Canada. UV-Vis-VNIR.

didymium

Colored Glass Filter Sets

Color filter sets are useful for checking calibration of spectrophotometers and spectroradiometers in the color range (360-830 nm). Filters are colored glass, not thin films, so they are rather broadband rather than narrow band cut-off filters. Calibration is done on a narrow bandpass high resolution UV-Vis-NIR spectrophotometer with calibrations traceable to the National Research Council Canada. Filters are available in 2" square size.

As some of the filters in our original color sets are no longer being produced, we have had to make changes in the composition of the original CFS-08 and CFS-12 sets. We regret any problems this may cause.

colored filter
colored filter

Part #

Description

CFS-08-02C Set of eight filters (blue, blue-green, green, yellow, orange, red, violet, broadband visible), in wooden box. Calibration traceable to National Research Council Canada.
CFS-08-02U Set of eight filters (blue, blue-green, green, yellow, orange, red, violet, broadband visible), in wooden box. Uncalibrated, representative spectral scans included.
CFS-12-02C Set of twelve (all of the above plus a different green and better coverage in the yellow/orange/red range), in wooden box. Calibration traceable to National Research Council Canada.
CFS-12-02U Set of twelve (all of the above plus a different green and better coverage in the yellow/orange/red range), in wooden box. Uncalibrated, representative spectral scans included.

 

Individual Colored Glass Filters

Part #

CFX-020 X is filter designation — contact for details.