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.
A beef roast cooked to medium-rare should have an internal temperature of 145Â°F - 150ÂºF after the resting period, and a roast cooked to medium should have an internal temperature of 150Â°F to 160ÂºF. (See the note below). See Beef Doneness for more information on proper cooking temperatures.hen roasting beef it is important to select the proper cut of roast beef to produce moist and tender meat when the roast beef is cooked to the desired doneness. Using the proper beef cooking times and temperatures is critical to the end results.