Getting the Heat Right: A Real Look at Twin Tube IR Lamps
If you’ve ever tried using a standard, off-the-shelf infrared lamp for glass R&D, you know the frustration. They just give you a generic heat curve. But when you’re messing around with new glass compositions, “generic” doesn’t cut it. You don’t always want a flat, uniform heat; you need to control exactly where that energy hits your material.
It’s more than just the size
Most suppliers will ask you about length and diameter and call it a day. We look at it differently. For us, it’s all about power density. By tweaking how the filament is wound and adjusting the gas pressure inside the twin-tube design, we can actually push the heat toward specific zones. It’s a bit like sculpting the heat. Need a violent ramp-up in the center but a gentle soak on the edges? We just spec out the wattage distribution to match that exact profile. It makes the testing process feel way more intuitive.
How the Twin Tube actually works
The magic here is simple: the twin-tube setup doubles the emitting surface area without taking up more space. This means you get a ton of radiant flux without having to crank the voltage so high that you fry your filaments. We use high-purity quartz, too, so the shortwave radiation actually gets out of the lamp and into your sample. As for the connections, we do the usual R7s or Sk15. But since R&D rigs are usually a bit “experimental,” we’re happy to customize the lead wires so they actually fit your specific power supply without a struggle.
The trade-offs (The honest part)
Here’s the thing: pushing a lot of power into a small area comes with some risks. When we concentrate that wattage to hit high temps fast, the quartz takes a beating. It’s under a lot of thermal stress. **Please, don’t clamp these tubes too tight.**If your mounting brackets don’t leave room for the glass to expand, the tube will just snap during a high-wattage cycle. It’s a loud, annoying mistake that’s easy to avoid. Also, keep an eye on your cooling. Those high-density zones throw off a lot of ambient heat, so make sure your fans or cooling systems can actually handle the load.