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?
Find 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 you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers
You Might be Interested in
Shear strain can be expressed in units of either degrees or radians. a) True b) - False
Answers (1)
Which of the following is "invalid" assignment? name (x) < - c ("New York", "Seattle", "Los Angeles") names (x) < - c ("New York", "Seattle", "Los Angeles") x < - list ("Los Angeles" = 1, Boston = 2, London = 3)
Answers (1)
What is the basic process a technician should use when diagnosing concerns
Answers (1)
For a column that is pinned at both ends, the critical buckling load can be calculated as, Pcr = π2 E I / L^2 where E is Young's modulus, I is the moment of inertia of the cross sectional area, and L is the length of the column.
Answers (1)
Choose the correct option in terms of Issues related to professional responsibility a) Confidentiality b) Intellectual property rights c) Both Confidentiality & Intellectual property rights d) Managing Client Relationships
Answers (1)
New Questions in Engineering
Between a hypothesis and a prediction
Answers (1)
A local reaction is when a chemical enters the bloodstream?
Answers (1)
The rules for ordinary arithmetic involving addition, subtraction, and multiplication carry over into modular arithmetic. Tru
Answers (1)
An air-conditioning system is used to maintain a house at 70°F when the temperature outside is 100°F. The house is gaining heat through the walls and the windows at a rate of 800 Btu/min, and the heat generation rate within the house from people,
Answers (2)
The electricity we use is static or current electricity?
Answers (1)