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 the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers
You Might be Interested in
What are some common ways of converting fuel to useful energy? Check all that apply. freezing it rotating it burning it heating it
Answers (2)
3. In the text, we described a multithreaded file server, showing why it is better than a single-threaded server and a finite-state machine server. Are there any circumstances in which a single-threaded server might be better
Answers (1)
Our goal is to design a traffic-light controller with the following properties; it lights up the green light (output G) for 15 seconds, followed by the yellow light (output Y) for 9 seconds, then the red light (output R) for 12 seconds.
Answers (1)
1. On a 2001 Honda Civic, while replacing fuel injectors, what do you coat the new O-rings with?
Answers (1)
Define the hydraulic diameter for a rectangular duct.
Answers (2)
New Questions in Engineering
A hydraulic power unit is sometimes referred to as a?
Answers (1)
8.21 In the final stages of production, a pharmaceutical is sterilized by heating it from 25 to 75°C as it moves at 0.2 m/s through a straight thin-walled stainless steel tube of 12.7-mm diameter.
Answers (1)
Which of the following can improve your car's gas mileage? A. Equipment racks B. Cargo carriers C. Sports team flags D. Car aerodynamics
Answers (2)
Which of the following describes a logic bomb? a rogue piece of code in a system activates on a certain date a piece of code replaces the boot instructions the cookie tracker is exploited to note your browsing habits a piece of code hidden in a
Answers (1)
Supercharging is the process of (a) Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere (b) providing forced cooling air (e) injecting excess fuel for raising more load (d) supplying
Answers (1)