Suppose a person (height of 1.8 m) walks in a room installed with a pyroelectric infrared (PIR) motion detector. The distance between the person and the PIR detector is 5 m. The PIR detector sensor is 3 cm x 1 cm in size.
Estimate the radiated power at the surface of the sensor from the person. Assume that emissivity of human skin/fabric and sensor cap is 0.9. Assume that the person's body temperature is 37°C and the temperature at the surface of PIR detector is at 18°C. Also assume that there is no radiated power loss through air and Fresnel lens. You can roughly estimate surface area of the person.
Answers (1)
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Suppose a person (height of 1.8 m) walks in a room installed with a pyroelectric infrared (PIR) motion detector. The distance between the ...” in 📙 Engineering if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers
You Might be Interested in
Which statement is not correct regarding the deformation of a circular shaft in torsion? a. Cross sections remain flat. b. Longitudinal lines remain straight. c. Circular sections remain circular. d. Radial lines on the sections remain straight.
Answers (1)
1. The AWS A5.5 is a list of electrodes used to weld which type of metal? A Copper and copper alloys. B. Carbon steels. C. Low alloy steels. D. Gray and ductile iron. E. Corrosion-resistant steels.
Answers (1)
1. When your brakes fail, first try __. A. pumping the brake pedal B. holding the brake pedal down C. pressing the accelerator D. kicking the brake pedal
Answers (2)
A worker's hammer is accidentally dropped from the 20th floor of a building under construction. With what velocity does it strike the pavement 304 ft below, and what time t is required?
Answers (1)
A local reaction is when a chemical enters the bloodstream?
Answers (1)
New Questions in Engineering
Familiarity with basic fastener properties: For each of the standard fasteners specified informally below, determine the major diameter d, the pitch p, the pitch diameter dp, and the bolt length L.
Answers (1)
The diameter of a cylinder is called the a.) stroke b.) bore c.) principal length d.) radius
Answers (1)
Consider the following grooves, each of width W, that have been machined from a solid block of material. (a) For each case obtain an expression for the view factor of the groove with respect to the surroundings outside the groove.
Answers (1)
What is the last step to the design process? A: Define the problem B: Present solution C: Evaluate a solution D: Develop a solution
Answers (1)
The controller can be considered the brain of closed loop system
Answers (1)