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    Q: What is a high etendue / high throughput spectrometer


    A: Most spectrometer designs currently available today require a slit to produce high resolution spectroscopy results. This slit is required due to the etendue or the solid angle area product that can be accommodated by the instrument.  This limits the throughput of the instrument or the amount of light that can be passed through the device. This slit can result in more than 95 % of the light being thrown away by the instrument, however as this fact is a constant this is not taken into account in the final instrument transmission specifications. ISI high throughput spectrometer and Raman spectrometer does not require a slit and can accept all the light from a 1 mm diameter 0.22 NA optical fibre, greatly increasing sensitivity.


    Q: What is a LIDAR?


    A: LIDAR stands for LIght Detection And Ranging. It is sometimes known as LADAR (LAser Detection and Ranging). In essence it can be thought of as a Laser radar, but the only describes a fraction of a LIDAR’s capabilities.


    Q: Can a LIDAR do what I want?


    A: Most LIDARs today are Laser rangefinders, such as those used by surveyors and estate agents. These can measure distances accurately. At ISI we specialise in more innovative uses of LIDARS, using them to measure pollution, process leaks, surface profiles and identification of molecules, both in gases and as liquids. We also use them to measure distances very accurately, but dramatically better than the everyday versions.


    Q: Aren’t lasers dangerous?


    A: Like most pieces of industrial equipment lasers can be dangerous if used in a dangerous manner. Use of lasers can be very safe if the correct design and expertise is applied. This is what we at ISI can provide, ensuring that any laser-based solutions we supply will not present a danger to employees, equipment or the public.


    Q: Aren’t LIDARS big and expensive?


    A: Most LIDAR companies would like you to think so. LIDARs have been in operation in Universities and Research laboratories almost as long as lasers have been around. These setups were very large and expensive. Most LIDAR companies are still building these kinds of products. At ISI we are always looking at the best of the new technological developments to ensure all of our products are as small and low cost as possible.

IS-Instruments Products




The divergence of an electromagnetic beam is an angular measure of the increase in beam diameter or radius with distance from the optical aperture from which it emerges




LAaser Detection And Ranging (also known as LIDAR).  LADAR is a term often associated with military applications.  The term "laser radar" is sometimes used even though LIDAR does not employ microwaves or radio waves and is not therefore in reality related to radar




Light Amplification by Stimulated Emission of Radiation.  A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons




LIght Detection And Ranging (also known as LADAR).  The term "laser radar" is sometimes used even though LIDAR does not employ microwaves or radio waves and is not therefore in reality related to radar




General term used to describe elements of a system typically manufactured from metal, but may also be made from a variety of plastics.  Such elements include brackets, holders and baseplates




The operation of simulating real systems in a computer




Numerical Aperture. The range of angles over which the system can accept or emit light. In optical fibres it is also known as the acceptance angle.




General term to describe elements of a system that are typically manufactured from glass.  These include lenses, mirrors, windows, filters and windows

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