November 2015Analytical Instrumentation & Environmental Monitoring
Yokogawa Meters & Instruments Corporation has announced the release of the AQ6375B optical spectrum analyser. Based on the company’s highly successful AQ6375, an optical spectrum analyser that utilises the dispersive spectroscopy technique, the AQ6375B incorporates a number of new features that improve the accuracy of measurements made in the 1,2 to 2,4 m wavelength range.
With the growing effort in recent years to reduce the amount of greenhouse gasses and other harmful substances that are released into the atmosphere, increased attention is being paid to techniques such as laser absorption spectroscopy that can perform highly accurate measurement of carbon dioxide, methane, and other gasses that have a harmful effect on the environment.
The use of near-infrared lasers with a 2 m wavelength is essential in laser absorption spectroscopy, and this laser emission spectrum needs to be measured with high accuracy.
Large-scale measuring systems with spectrometers are generally used to measure the emission spectrum of near-infrared lasers in the 2 m band. In November 2007, Yokogawa launched the AQ6375, a bench-top optical spectrum analyser that uses dispersive spectroscopy and supports the near-infrared wavelength range, and has continued to make contributions in this field.
There are some issues, however, that can affect the accuracy of measurements made with such instruments. One such issue is the negative impact that water vapour can have on the accuracy of spectra measurements in the upper near-IR wavelength region. Another is that there are some cases where the original optical spectrum cannot be accurately measured due to the effect of higher order diffracted light with a longer wavelength than the input wavelength.
The AQ6375B incorporates a number of new features that eliminate these effects and thereby improve the accuracy of measurements made in the 2 m band.
Product features
Purging mechanism to eliminate water vapour inside the spectroscope
The spectrum of the light under measurement can be measured with greater accuracy by eliminating the absorption of particular spectra that occurs as the result of water vapour being trapped inside the spectroscope. This is accomplished by a purging mechanism that eliminates the water vapour by continuously supplying a gas such as nitrogen through a connector on the back panel of the device.
Light blocking filter that reduces the effect of higher order diffracted light
The effect of higher order diffracted light with wavelengths that are two to three times longer than the wavelengths of incident light is reduced by a light blocking filter. This removes the light with wavelengths that are shorter than the range of measurement wavelengths contained in the incident light.
Yokogawa entered the optical measuring instrument market in the 1980s and since then has developed this business by focusing on visible-range light sources and optical power meters. In April 2004, Yokogawa acquired Ando Electric, one of the world’s top optical communications measuring instrument manufacturers, and since then has developed products that utilise the strengths of both companies.
With the aim of becoming one of the world’s top manufacturers of optical measuring instruments, Yokogawa takes into consideration the latest market trends and user needs when developing its products.
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