Today, as the IR sensing technology evolves, the sensors also come in various system designs. Active Infrared (IR) sensors can be an emitter and detector as a single unit operating at the same. wavelength, or photoelectric sensor working with reflective surfaces. IR sensors can be categorized. as retro-reflective sensors and diffuse reflection sensors. Retro-reflective sensors are more proper.
1 A note about your meat: make sure you get rump roast, round roast, or sirloin-one of the cheaper cuts. 2  Using the slow roasting method for prime cuts of beef doesn't work as well, since prime cuts are more tender. 3  If you want to cook a prime cut of beef, see How to Cook a Prime Rib Roast. If you want to cook a prime cut of beef, see How to Cook a Prime Rib Roast. 2  Make sure the beef you get is boneless, and check for a dark pink, springy surface and plenty of marbling. 3  Depending on the cut you get, it might have a cap of fat on top.
1 Cooking temperatures vary depending on the weight of your roast. 2  For every pound of meat youâre roasting, it will take approximately 12 minutes for rare, 14 minutes for medium, and 16 minutes for well-done. great roast beef should be beautifully browned on the outside and tender pink when itâs cut open. Every thin slice should be so moist that it almost melts in your mouth when you bite. Thereâs a lot of conflicting information out there about how to make the perfect roast beef.