A wooden plank-and-beam room used for secure storage has no windows or environmental controls. The room will experience a temperature of 98.6°F (37°C) for about 20 minutes at 11:23 a.m. and again at 8:17 p.m. for several months during the summer. Which sensor listed below would have its detection ability affected by this scenario?

Microwave sensors operate by emitting microwave signals and analyzing the reflection of those signals when objects move within their range. This technology is not significantly affected by ambient temperature changes, such as those in the wooden room, allowing for reliable detection regardless of the room's thermal environment.

Ultrasonic sensors function by sending out sound waves and measuring the time it takes for the echoes to return after bouncing off objects. Similar to microwave sensors, ultrasonic detection is not influenced by temperature variations within the room, meaning it can maintain its effectiveness under the specified conditions.

Photoelectric beam sensors rely on light beams to detect motion. While they can be affected by environmental factors such as dust or obstructions, they are not directly impacted by temperature conditions in the same way that passive infrared sensors are. Their operation remains effective in a stable thermal environment.