Note: It is important to know which OGI camera is right for you, as OGI cameras operate on a very limited wavelength where the gas you may need for your detection services are not visible.

OCT500 Optical Coherence Tomographer. Optical coherence tomography (OCT) with integrated fundus imaging ... OCT 500 has an integrated full color fundus camera.

A6260 Research and development camera operating on the 0.9 to 1.7 µm waveband. With synchronization controls allowing for high-speed pictures to be taken with integration timings.

SWIR wavelengthrange

In infrared thermography, there are three wavelengths that can be broken down even further to specific wavelength ranges. The three wavelengths are: Short Wavelength Infrared (SWIR), Medium Wavelength Infrared (MWIR), and Long Wavelength Infrared (LWIR).

A brief overview of the many types of optics used to focus and manipulate beams in laser systems.

SWIRScope

For reading documents with smaller letters, magnifiers of 2x to 3x magnifying power, consequently with wider image field, are suitable. Those with 5x to 7x magnifying power are most adequate for daily desk use. For the inspection of very fine details, magnifying power of 10x to 15x is recommended. However, if you tried to read a newspaper with a 10x magnifying power magnifier, you would have to move the magnifier along each letter because of the small image field, with the result that you would be unable to catch the import of the sentences. Therefore you should select a magnifier with an magnifying power that suits your purpose, and to realize that expensive magnifiers with high magnifying power are by no means universally usable. This is the first basic point about selecting magnifiers.

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MWIRwavelength

The magnifying power of a magnifier is not a constant, but varies continuously within a certain range with changes in distance between the magnifier and the eye, as well as with changes in the working distance. So its value is indefinite as long as the condition of use is not specified. The value of the magnifying power of a magnifier engraved on its barrel or listed in catalogues is the so-called „normal magnifying power“, which is the magnifying power under the condition that the object under inspec- tion ist placed on the „focal plane in the object space“ of the magnifier. In this case, the rays of light emitted from each point of the object become parallel with each other after passing through the magnifier, as is shown in Fig. 1, and hence the virtual image of the object is formed at infinite distance from the eye with an infinetely large length. Hence the value of the „magnification“ of the image is infinite, but the magnifying power in this case, or the normal magnifying power of the magnifier takes a finite value, and is given exactly by the formula

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Several kinds of special magnifiers have been manufactured for special purposes, with the same value of nor- mal magnifying power as ordinary ones but with some unusual features. For instance the „Anastigmatic Loupe 4x“ with a very wide and flat image field is suited for inspecting fine details of 35 mm size microfilm negatives or for viewing color slides, without having to move of the object or the magnifier. The „Telecentric Loupe 7x“ fitted with a glass scale can be used to read accurately the deflected position of a meter needle that moves in a plane slightly different from that of the ruled scale. The „Retrofocus Loupe 7x“, because of its very long working distance, allows one to inspect the bottom of a small and deep hole, or to observe the fine structure of electrodes in a vacuum tube from outside the bulb. At present, however, only one or two kinds of magnifying power are available in such special magnifiers. If you want a special magnifier with a different magnifying power, the manufacturer can design and make it to your specifications, but the cost will be extraordinarily great due to a lot of mental labor and time required in the optical design. The fact is common in every order-made optical instrument, and the only way of reducing the cost is to order a large number of the same product by gathering the demand of persons equally interested in using it. This is the third basic point about ordering special magnifiers.

Long WaveLength Infrared cameras are the primary devices used in temperature inspection practices. The LWIR camera can detect distinct temperature differences important in the home inspection field for visualizing poor insulation, water damage, and damaged electronics.

SWIRsensor

Safety Inspections of machinery and infrastructure that contain pollutant and toxic gasses are simplified and put safety first when using MWIR cameras on drones.

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T1020 HD Implements HD Resolution, MSX, and UltraMax. With the ability to detect temperature differences down to <20 MK. While capturing up to 3.1 Million pixels per image.

SWIRcamera

A magnifier or magnifier glass, also called a loupe, is a lens or a lens-system that can form a magnified virtual image of an object. When a magnifier is placed between the object and the observer’s eye, the observer can inspect fine details of the object by viewing the magnified image of it. Magnifiers of various “magnifying power” are manufactured according to the purpose for which they are used. The same object can be seen in larger scale by a magnifier of higher magnifying power. However, magnifiers with higher magnifying power have the shortcomings of a smaller image field and a shorter working distance (i.e. the distance between the object under inspection and the magnifier); the latter effect makes their use less convenient. The magnifier with a magnifying power of 2x to 3x is usually a single convex lens, relatively low in cost; those with high magnifying power are composed of 2 to 5 pieces of convex and concave lenses made of different kinds of optical glasses in accordance with elaborate optical design for the correction of aberrations, and so are more expensive.

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Many thermal photographers often confuse these technologies with night vision, so it’s important to clarify the distinctions.  Night vision devices are cameras that enhance small amounts of visible light to illuminate an area.

These imagers have the ability to capture clear detail through smog, clouds, and haze. SWIR cameras are the only wavelength technology that can penetrate cloud coverage and capture a clear image.

being independent of the distance between the magnifier and the eye. From the formula it is easily calculated that a magnifier with a 25 mm focal length has a normal magnifying power of 10x, and one with a 50 mm focal length has 5x normal magnifying power It can be seen also that the normal magnifying power of a „weak“ magnifier with a 250 mm focal length is 1.0x, meaning that no benefit can be obtained by using such a magnifier. Furthermore, a weaker one with a 300 mm focal length has a normal magnifying power of 0.83x, which means that the size of the virtual image viewed through it is smaller than that of the objekt viewed with the naked eye at a distance of 250 mm! These results are absolutely correct so far as the „normal magnifying power“ is concerned.

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MWIR cameras are important when detecting gas leaks that are invisible to the human eye. These cameras are also used when detail is more important than exact temperature. Allowing the camera to be used as a perfect tool for airport perimeter security, as well as lab research for engineers and scientists.

Aluminum is as low as 88% reflectivity at one micron while copper is better than 98%. In fact copper is nearly as good as gold.

SWIRapplications

Zenmuse XT2 4k Camera + Thermal Sensor. Uses MSX technology to take high quality infrared imagery. Note: This camera is a weather resistant camera which can be used in the rain, snow, smoke, and fog. Using a weather resistant drone such as the DJI Matrice 200 Drone.

Observation with a magnifying power of 20x or more is usually accomplished by a compound microscope, which is composed of an objective lens and an eye-piece separated by a definite distance. The objective lens forms a magnified but inverted real image of the object under inspection, and the eye-piece, which is a special kind of magnifier, further magnifies the real image. Thus the compound microscope can be compared to a two- step amplifier, wheras a magnifier is considered as a single-step one. Hence the former can have a very high magnifying power, such as 100x to 1000x; and when used at low magnifying power of 20x to 30x, it has a wider image field and a longer working distance than a magnifier with the same magnifying power

SWIRmeaning

Short Wavelength cameras are used in daytime starlight imagery because of SWIR’s ability to capture reflected light with peak solar illumination.

Choosing between which type of Infrared Device is challenging! Knowing the Difference between the each wavelength and how they operate is the first step. You might also be interested in some of our other recent posts regarding thermal imagery: GETTING STARTED WITH THERMAL IMAGING and MSX implementation.

Hithero the term magnifying power has been used without precise explanation. It is different from the “mag- nification” of the image, i.e. the physical quantity defined as the ratio of the lateral length of the image of a small object itself. The magnifying power refers to the combination of a magnifier (or a compound microscope) and an observing eye. It is defined as the ratio of the view angle of the magnified virtual image of a small object to that of the same object viewed with the naked eye at 250 mm (ca. 10”) distance from it, which is approxi- mately equal to the ratio of the length of the image formed on the retina of the eye in each respective case. Thus if the magnifying power of a magnifier is 7x, the lateral length of the image viewed through it is 7 times that one of the same object seen with the naked eye at a distance of 250 mm. In this case, the area is magnified about 72 or 49 times.

SWIRvs NIR

The compound microscope does however have some disadvantages; it is massive and expensive, the object under inspection must be placed on its stage, and the observed magnified image is inverted. Here one sees the advantage of having 20x to 30x magnifiers, which make possible the observation of the erect (i.e. not inverted) image of each part of a large object that cannot be laid on the microscope stage. Such magnifiers are indispen- sable, for instance, in photo-mechanical processes. These high magnifying power magnifiers, however, have a very short working distance, and further, the opti- cal axis of the observer’s eye must coincide correctly with that of the magnifier. This latter condition requires some experience on the part of the user, and incorrect use of these magnifiers prevents the user from taking full advantage of their performance. It should be emphasized again that one should carefully select the magnifying power of magnifiers, now available from about 2x to 30x.

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Mountable/Drone Camera G300-A Lightweight drone mountable camera, visualizes gasses for monitoring installations in remote or hazardous areas.

Knowing the difference between Middle Wavelength Infrared and Long Wavelength Infrared is extremely important as MWIR and LWIR devices are capturing separate waves that are useful for many different reasons.

The „normal using condition“ described above, however, is by no means recommended in using ordinary magnifiers. The most efficient method is to bring the eye as close as possible to the magnifier, and adjust the distance between the object and the magnifier so that the virtual image ist formed at a 250 mm distance from the eye as shown in Fig. 2. If the eye is brought in contact with the magnfier, or more strictly speaking, if the „nodal point in the object space“ of the eye is made coincident with the „nodal point in the image space“ of the magnifier, and the virtual image is formed at the position stated above, then the magnifying power takes a maximum value magnifying powermax given by the following formula

Long Wavelength Infrared is the most commonly used form of Infrared technology. LWIR imagers detect radiated temperatures that indicate important information to the operator. For more information on LWIR cameras and there applcations please check out our GETTING STARTED WITH THERMAL IMAGING post.

Tau Used for: hyperspectral instrumentation, silicon inspection, electro-optical payloads, art restoration, and portable imaging

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FLIR’s OGI technology uses MWIR cameras to detect certain gasses like Methane, Propane, Ethanol, Sulfur Hexafluoride, and more.

Middle Wave cameras are used as detection systems for gas leaks, some of which are completely invisible to the human eye!

All Thermal imaging devices operating on the infrared wavelength are, ‘imagers‘ that we commonly refer to as ‘cameras’, however they are actually sensors that can detect radiated heat.

It may usually be impossible to realize this condition exactly, but the nearer the eye is brought to the magni- fier, the more closely the magnifying power takes a value given by the above formula. Hence the magnifying power of a 300 mm magnifier will be approximately (1 + 0.83) or 1.83x, and that one of a 250 mm one will be about (1 + 1.0) or 2x. This means that the magnifying power of a magnifier is always greater than 1x, however weak it may be, as long as it is used under the condition stated above. The medium power magnifier with a normal magnifying power of 5x or 7x can also have a magnifying power of nearly 6x or 8x respectively if used under the above condition. To realize this condition, hold the magnifier with one hand and keep it as close as possible to your eye, while adjusting the position of the object under in- spection with the other hand until the magnified virtual image can be observed sharply. This is the second basic point about using magnifiers.

FLIR’s PathfindIR II The PathfindIR is a Long Wave Infrared imager intended to be attached to vehicles for night use. This LWIR detects road hazards in complete darkness highlighting road hazards such as vehicles, animals, and people. The PathfindIR makes night driving safer and detects hazards from four times farther away than headlights do.