Details
Setting up the optical interface to a sample can be time consuming. To simplify this process, NLIR offers two TRANSMISSION Measurement Systems to ease your measurement case. Each system includes NLIR’s MIDWAVE Spectrometer, Light Source, Software, and fibers — allowing you to plug in the devices and start measuring immediately.
There’s no one-size-fits-all solution for spectroscopic transmission measurements, as different samples require different interfaces. Over the years, NLIR has developed custom solutions and conducted extensive testing across various industries to carefully craft TRANSMISSION Measurement Systems. Our most effective and widely used systems are featured here below.
Choose the best Transmission Measurement System for your needs
Thin, semi-transparent samples are ideal for transmission spectroscopy. As long as the sample is not too absorptive, transmission is an easy and efficient way of measuring its infrared properties.Â
With NLIR’s fiber-coupled TRANSMISSION Measurement System, it is very easy to start measuring the infrared properties of films, foils, coatings, and even liquids in thin flow cells. The fibers make it easy to mechanically decouple the light source and spectrometer from the sample. NLIR has designed various TRANSMISSION Measurement Systems for efficient measurements of different samples.
Are you interested in any of the TRANSMISSION Measurement Systems? Submit your inquiry today.
Get a Quote
* Required fields. Your personal data is kept confidential.
Optical Coating and Thin Film Transmission Measurements
Perfroming optical coating and thin film transmission measurements is straightforward. Just set up MIDWAVE Spectrometer, FIBER Light Source and TRANSMISSION Interface, plug it to NLIzeR Software, and get measurement data as you go.
Plastic Transmission
​A 30 W globar was the mid-infrared light source in these transmission measurements of a 50 µm polystyrene (PS) film and a 800 µm polyethylene terephthalate (PET) film. The MIDWAVE Spectrometer was set to 20 ms exposure time and capturing just single shots. No averaging or smoothing has been applied to the data subsequently.​
Computer algorithms can certainly tolerate a much shorter exposure time, and thus a faster acquisition, in the context of plastic recognition or thickness analysis.
Optical Coating Transmission
A 30 W globar was the mid-infrared light source for these transmission measurements of coated optical windows: a Ge bandpass filter (BPF) for 3.7 – 4.5 µm and a YAG mirror coated with high reflection at 1064 nm and high transmission at 2.1 -4.5 µm. The MIDWAVE Spectrometer was set to 20 ms exposure time and captured just single shots. No averaging or smoothing has been applied to the data subsequently.​
Coating quality control or production monitoring require such measurements.
How to pick the right Optical Interface for your measurement needs?
The key to a successful optical characterization setup is by ensuring that infrared light interacts with the sample in a way that brings the most amount of light with the most amount of information to the detector. For example, a metallic mirror reflects a lot of light so as a sample it gives a high signal but little information about the mirror substrate because the light never enters beyond the front surface of the mirror. That is why you should be using REFLECTION Measurement System. On the other hand, a piece of black plastic measured in transmission will give insufficient light for the detector, however a small amount of light that makes it through carries a lot of information about the plastic. That is why you should refer to TRANSMISSION Measurement System.
While considering the right interface for your measurement needs, you need to take into account several factors. Below we provide a few examples where TRANSMISSION Measurement System with particular interface would help you achieve the best measurement results based on your sample.
Thin Film characterization with TRANSMISSION Interface
Performing thin film characterization is ideal with TRANSMISSION Interface. It gives both high signal and lots of information. If the foil becomes too thick, typically more than 1 mm, insufficient light for a spectrometer is likely to be a problem.
Optical Coating Characterization with TRANSMISSION Interface
NLIR’s mid-infrared spectroscopy solution offers rapid measurement of IR coatings. With millisecond precision, measure full spectra using TRANSMISSION Interface for production monitoring and batch quality assurance.
