Advantages of Using lenses in Infrared Applications

Compared to many other forms of optical infrared lenses, meniscus lenses are rarely offered off-the-shelf. While meniscus infrared lenses are primarily used for focusing to small spot sizes or collimation applications, plano convex infrared lenses often offer a superior price-to performance ratio. There are scenarios, though, where meniscus infrared lenses provide significantly superior performance at only a moderate increase in price.

Spherical Aberration

Due to the spherical nature of a lens, spherical aberrations cause parallel rays at different distances from the optic axis to not converge at the same point. While spherical aberrations can be corrected by using multiple elements that overcorrect other elements, for many infrared lenses systems where materials are significantly more costly than visible materials, it is ideal to minimize the number of elements. In lieu of using multiple elements, it is possible to minimize spherical aberration for a single lens by shaping the lens into its best form.

For a fixed index of refraction and lens thickness, an infinite number of radii combinations exist that can be used to create a particular focal length lens. These combinations of radii create different lens shapes which directly result in spherical aberrations and coma due to the degree in which a ray bends as it travels through the lens.

Benefits of Meniscus Design

When working in the visible, glass indices typically range from 1.5 to 1.7 and the shape for minimum spherical aberration is nearly plano-convex. In the infrared lenses, however, higher index materials like germanium are typically used. Germanium, with its index of 4.0, greatly benefits from a meniscus lens design by significantly reducing spherical aberrations.

The minimum spherical aberration occurs when the ray is bent equally at both interfaces. While the first surface of a germanium meniscus lens causes light to bend slightly more than a comparable PCX lens, the second surface of a PCX lens causes light to bend significantly more, resulting in an overall increase in spherical aberration.

Which compares the performance of a 25 x 25mm germanium PCX lens to a 25 x 25mm germanium meniscus lens, it is easy to see how the PCX lens causes light to bend significantly more with respect to the lens surface than the comparable meniscus lens. This increase in bend causes an increase in spherical aberration. The germanium meniscus lens demonstrates a drastic decrease in resulting spot size, making it more ideal for use in demanding infrared lenses applications.

This article comes from edmundoptics edit released

Infrared camera and thermal imaging module

The long-wave thermal imaging modules for a wide variety of applications and are available with a choice of array sizes, pixel pitch and lens options. They can be delivered as self-contained camera units or as thermal imaging modules for integration into end-user products.

Our thermal imaging modules include the MIRICLE range, ultra low-power MicroCAM 2 and MicroCAM 3 cores with patented shutterless XTi Technology, MicroCAM irGO thermal imaging cameras, FevIR Scan fever screening system and MicroCAM HD high definition thermal imaging cameras.

This article comes from thermoteknix edit released

Thermal Monocular Camera for Long-Range Surveillance Detection

Thermal Monocular camera that “see” heat instead of light. Sometimes referred to as cameras, they produce an image that portrays objects using their temperature instead of their visible properties.

So how does thermal monocular camera see heat? All objects warmer than absolute zero (-273°C/-459°F) emit infrared radiation in the MWIR and LWIR wavelengths (3µm–14µm) in an amount proportional to the temperature of the object. Thermal Monocular camera focuses and detects this radiation, then translates the temperature variations into a greyscale image, using brighter and darker shades of grey to represent hotter and cooler temperatures, which gives a visual representation to the heat profile of the scene. Many thermal imagers can also apply color profiles to these images, showing hotter objects as yellow and cooler objects as blue for example, to make it easier to compare temperatures in the image.

In order to “see” radiated heat, special lenses and sensors are needed to focus and detect electromagnetic radiation in the MWIR (mid‑wave infrared) and LWIR (long‑wave infrared) ranges.

Thermal Monocular camera Sensors

To detect thermal energy, special FPAs (Focal Plane Arrays) are required. These can be divided into two types, cooled and uncooled detectors.

Cooled detectors exist to maximize detection performance. Since we’re detecting radiated heat, any heat from the camera components themselves makes it harder to see the image of the scene. Both our high-definition MCT (Mercury Cadmium Telluride or HgCdTe) sensors and our Indium Animonide (InSb) sensors incorporate a cryogenic cooling system to reduce the “noise” from the heat of the internal camera components and the sensor itself. This allows for detection of thermal energy with an accuracy as fine as 0.025°C.

Uncooled detectors are also available which are more affordable and compact due to the lack of a cryogenic cooler. We use vanadium oxide (VOx) detectors in our uncooled cameras and combine them with wide aperture lenses to maximize their performance (see below).

Lenses for Thermal Monocular camera

For visible light, glass lenses are typically used to focus light on a camera sensor, however glass is not transparent to thermal radiation. Instead, thermal lenses are constructed from a special metal called Germanium (Ge). This is a relatively rare element and thus is quite costly, with raw prices often as high as $2000 per kilogram. Depending on the type of sensor, lenses of different specifications are required.

Our cooled sensor thermal cameras are designed to have the best long-range detection. We have a wide variety of long-range continuous zoom lenses, allowing the operator to smoothly transition between wide angle and long range. Our germanium lenses are available in lengths of up to 1400mm, allowing us to reach detection ratings of over 50km.

Since uncooled thermal imagers are inherently less sensitive than cooled sensors, we maximize the quality of those images by using lenses with an extremely wide aperture of ƒ/1.0. This wide aperture allows more thermal energy through to the sensor for detection; twice as much energy as that of a lens with an aperture of ƒ/1.4, or four times as much as ƒ/2.0.

This article comes from infinitioptics edit released

Clip Thermal Weapon Sight on Scope

The thermal weapon sight clip on thermal rifle scope is a hardcore military weapon sighting system that will perform in the worst of conditions without fail. Designed as a multi-purpose infrared scope the thermal weapon sight works the way your mission profile demands. The thermal weapon sight can be used as a handheld thermal spotting scope, or a stand alone thermal weapon sight or an amazing clip on thermal scope. Built to withstand the rigors of combat the thermal weapon sight is waterproof and shock resistant. Complete kits are available to qualified purchasers with special pricing for law enforcement and military customers. Please contact us for more information.

The thermal weapon sight clip on rifle scope is the most versatile weapon sighting system available. This unique Military device really shines as a clip on weapon sight. Extensive research and precise optical calibration under the most demanding manufacturing processes allows the thermal weapon sight to “clip on” to the ront of your day scope.

That’s right IN FRONT of your optical rifle scope. The precision optical train of the thermal weapon sight maintains your point of impact through your day scope, through the thermal scope and out to your target. This means that you can easily switch between day shooting and night shooting without having to zero your weapon. Traditional thermal scopes are required to be zeroed to the weapon each time you swap with your dayscope or they require you to have two weapons one for day and one for night. With the thermal weapon sight when you need thermal weapon sight capabilities you just “clip it on” and away you go. The thermal weapon sight is an excellent mate to the ACOG 4x style of weapon sight but can be used with virtually any optical scope including red dot and holographic.

The thermal weapon sight operates on common CR123 batteries and has easy to use tactile buttons that can be operated with gloves on. The thermal weapon sight is a true Military Grade thermal imaging system that will satisfy even the most demanding mission applications.

This article comes from federalsensors edit released

How Thermal Imaging Module Works

A thermal imaging module on a drone turns it into a powerful tool, which can be used in many sectors from construction, mining, electrical, surveillance, firefighting, search and rescue.

Thermal drones which use vision imaging cameras have so many positive uses by detecting heat coming from almost all objects and materials turning them into images and video.

Heat vision cameras or thermal imaging modules are in fact really heat detecting sensors. These thermal cameras are also known by various names including.

Thermal imaging modules make pictures or video from heat, not visible light. Heat (infrared thermal radiation) and light are both parts of the electromagnetic spectrum. However, a camera, which can detect visible light will not see thermal radiation and vice versa.

thermal imaging modules detect more than just heat. Heat vision cameras detect the tiny differences in heat, even as small as 0.01° Celsius. This information is then displayed as various colors on a display, in thermal software or apps.

This article comes from dronezon edit released

Outdoor Thermal Security Cameras

We knows security is serious business, period. So we’ve developed the thermal security camera with nothing but the most serious components to get the job done. Whether you are on covert security operations, border patrol, nuclear power facility security or pulling surveillance missions by land or sea, these fully weatherized, rugged full pan tilt zoom infrared cameras will surpass your expectations.

The long range infrared cameras can be integrated into your existing security system for dependable performance any time of day or night, giving you the detection power you need to identify threats or obtain evidence even in complete darkness. The system is available in several configurations, including small, medium or long range lenses, and has several thermal sensors available to suit your mission profile.

This article comes from spi edit released

Wi-Fi Video Baby Monitor Camera

This is a HD Wi-Fi video monitor camera, which allows you turn your internet connected smartphone or tablet into a full featured baby video monitor camera allowing you to keep an eye on your baby from anywhere.

The product includes digital pan, tilt and zoom function, infrared night vision and two-way communication function which allows you to know what’s going on at any time and to communicate with your child. Monitor cameras with Wi-Fi connectivity operate via a secure clouds service called Hubble.

The Hubble app features free streaming and smart notifications to your smartphone, tablet or PC. Real-time motion, sound and temperature alerts give you peace of mind, wherever you are.

This article comes from walmart edit released

IP Security Camera

In an increasingly connected world, physical threats continue to be a major concern for governments, industry and consumers alike. The IP security camera segment according to IMS Research is expected to account for over 40% of the world security camera market and double in shipments by 2017.

With new video processing, motor control and voice processing capabilities, modern security systems include security cameras that need to process a large amount of data and transform it into information that can help us identify threats and prevent them from turning into reality. Modern security cameras have IP connectivity, either via wired Ethernet, IEEE 802.11 WiFi or HDBaseT, and many need to be deployed and harsh outdoor scenarios, where energy efficiency is of utmost importance.

We have supplied products for the analog surveillance market since the mid 1970’s, and to the IP surveillance market since its inception. Our comprehensive complete product portfolio for IP security cameras covers both their implementation and their deployment into virtually any field situation.

This article comes from microsemi edit released

How many security cameras do you need?

How many security cameras you need to protect your home generally depends on your home’s size and layout. You’ll need to consider things like how many areas you want to monitor, security camera viewing angles and indoor vs. outdoor security cameras to determine how many security cameras you’ll need.

You’ll also find that surveillance systems offer either single or multiple channels. Each channel represents a single security camera, so the number of channels you need in a system directly corresponds with the number of security cameras you plan on using. If you only plan on monitoring a single area, one security camera and a single channel should be sufficient. However, if you would like to monitor several areas at the same time, you’ll need a multi-channel system.

This article comes from safety edit released

UAV Thermal Imaging System For Gas Detection

Under certain circumstances, infra-red cameras are highly suitable for detecting gas escapes and the presence of gas in the air. They can be also helpful during tests on improving environmental safety. A UAV thermal imaging system can detect greenhouse gases in the air as well as gas leaks which may hazardous to the environment and can threaten human health.

Some gases used in industry can significantly damage the environment and may cost a lot of money if they go unnoticed. Therefore, it is essential to eliminate any uncontrolled leaks.

“Traditional” methods for detecting gases require direct contact between a probe and the gas with the use of sensor technology. These methods are restricted due the time required to get a reading from the sensor and the risk of non-detection due to the gas type or location of the leak (gases may leak to places other where the sensor is located).

To detect gases, we offer a specially constructed infra-red camera, which is able to visualise gas on the principle of infra-red thermography. The UAV thermal imaging system provides a full image of the scanned area and gas leaks are reflected in the image as changes in the intensity of detected radiation.

The UAV thermal imaging system is the ideal solution to detect leaks of hazardous gasses via unmanned air vehicles (drones/UAV systems) as there are options to change image and camera setting such as, emissivity, gas intensity range, camera type, and more through standard RC transmitters connected to the CAN bus or PWM inputs. The UAV thermal imaging system can also record measured data, including GPS coordinates and the wireless HDMI transfer of images to the pilot.

The UAV thermal imaging system is a highly precise system with a sensitive, cooled quantum detector and a resolution 320×240 and with a precise temperature sensitivity of 15 mK, which also enables to detect gases in very small concentrations.

Detected gases:

Benzene, Ethanol, Ethylbenzene, Heptane, Hexane, Isoprene, Methanol, MEK, MIBK, Octane, Pentane, 1-Pentane, Toluene, Xylene, Butane, Ethane, Methane, Propane, Ethylene, Propylene plus hundreds of other hydrocarbons and Volatile Organic Compounds (VOC).

This article comes from workswell edit released