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You established the fact that cameras can detect IR light. Why does one camera work but not the other one? No, the rear-facing camera is not broken. It’s designed to prevent infrared light from passing through the lens; therefore, no light is seen on the screen.

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Let’s take a look at some of the common surface combinations and what factors to take into account when choosing the right glue.

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Students may associate night vision equipment with infrared radiation. If so, be sure to point out that not all night vision devices rely on infrared radiation to “see in the dark.” Some devices amplify available ambient light, while others rely on thermal radiation.

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Many of today’s smartphones have IR filters on the rear camera and little to no IR filter on the front-facing camera. It’s important to test this demonstration with both cameras before presenting it to the class. Only one camera should have the filter. This information is important for part 2. Should both cameras have an IR filter, you will need to use an older device.

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To improve photo quality and to make images appear more like what we actually see with our eyes, camera makers apply films and filters to block out infrared light. This process maximizes the amount of visible light that goes through the lens.

The best glue to use on metal doesn’t have a straightforward answer. Polyurethane based glues (like Gorilla Glue) and cyanoacrylate based adhesives (like Gorilla Super Glue) will both work on metals, as will epoxies and contact adhesive; which glue is best depends on a few other considerations. These include; the other surface, how quickly you need the glue to cure and what environment the finished project will be in.

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If you thought metal and glue was tricky; plastic can be positively baffling. First and foremost; you need to know what type of plastic it is that you’re looking to affix to the metal surface. Certain glues are not recommended for use with plastic; either because they will not bond sufficiently or in some cases, will cause damage to the surface. The most versatile option for a strong bond between metal and plastic is an epoxy. Other glues will work; however with many caveats, so always ensure the adhesive is compatible with the plastic.

A polyurethane-based adhesive like Gorilla Glue or Gorilla Wood Glue is ideal for gluing metal to wood. Wood can be a tricky surface to glue to metal because the two are so different in density and porosity. However, the strength and flexibility of polyurethane-based glues are more than up for the challenge. In fact, the bond may end up being stronger than the wood itself.

The most important factor to consider here is whether the bond will be indoors or outdoors. Contact Adhesive would do the trick for both with its water-proof solution. Stay away from glues that should not be used on fabric or plastics as they would not be suitable and may damage the velcro.

Though we cannot see infrared light, we can still use it. For example, a TV remote control uses infrared light to change the channels. You can use a digital camera to detect its presence. Aim a remote at a smartphone camera and press a button; you may see a light on your camera screen. The phone camera detects the light from the remote control and turns that signal into the visible light seen on the screen. When you press a button, do you see visible light at the end of the remote without using a camera? That does not indicate you have IR vision super power. That indicator light means the batteries in the remote are functioning properly.

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Ensure that students understand and adhere to safe laboratory practices when performing any activity in the classroom or lab. Model proper laboratory safety practices for your students and require them to adhere to all laboratory safety rules. Do not stare at an IR light source for prolonged periods of time.

Choosing the right glue for the job can often be tricky, even at the best of times; this is especially true for projects involving metal. With so many different types of glue on the market—not to mention the virtually endless list of materials you may be wanting to adhere the metal to; knowing which product to use can be challenging to say the least.

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The sun actually sends out more light than the part we see. Just past visible violet light is ultraviolet (UV) light, and just past visible red light is infrared (IR) light. Neither is visible to the human eye. Infrared light does not depend on visible light–IR light can be detected in dark or obscure conditions. Almost everything gives off infrared light as heat. If human beings had eyes adapted to see infrared, they might be overwhelmed by all the glowing matter around them. However, animals such as snakes, vampire bats, and beetles have developed organs and receptors to detect infrared heat signatures.

Carolina is teamed with teachers and continually provides valuable resources–articles, activities, and how-to videos–to help teachers in their classroom.

Epoxies, polyurethane and cyanoacrylate based adhesives will all work well for gluing metal to metal, although an epoxy is probably the most versatile, if you’re looking for a strong, weather-resistant solution. In order to effectively adhere the two, it’s important to clean thoroughly and sand the two surfaces down so they are slightly rough—this will enable a strong bond to form. Also, be sure to clamp the metal in place for the duration of the drying time.

Both cyanoacrylate-based adhesives and epoxies are ideal for gluing metal to glass. However, if you need a bit more time to ensure the placement of the glass on the metal, an epoxy may be preferable. Take care not to leave fingerprints or oils on the bottom of the glass as this can interfere with the bond.

When gluing metal to rubber a cyanoacrylate based adhesive, like our Super Glue, would be ideal, as it provides a flexible, but incredibly strong bond. It also has the added benefit of drying very quickly. Keep in mind that this bond is not water-proof though; if this is an issue, consider using our fast drying Contact Adhesive instead.