Sensor Manufacturing and Process Control Week 3

---Using the empirical curves shown in the video on “Radar Level Sensors”, slide entitled “Power Loss vs. Distance, Frequency, and Antenna Diameter”, what is the absolute value of the power loss in dB using a 6 inch antenna with a 5.8 Gigahertz signal at a distance of 15 meters? (Type in an integer.)

50

---You want to install a new pulsed radar level transmitter in your old liquid storage tank. You know that the tank is constantly being filled and emptied of fluid, which creates large ripples on the surface. In addition, the top is not flat, so you are concerned about misalignment of the antenna relative to the surface of the liquid after you install it. What frequency range should you select for the transmitter?

6-11 GHz 

---Why do LIDAR systems rotate the laser and detector?

In order to limit the total energy received by any one detector

 

---Why do you find it difficult to accurately detect the speed of a vehicle moving directly towards your car, while a LIDAR system performs this task easily?

The background and difference in angle between you and the vehicle barely change, and your eyes have no reference system for inferring speed.

The LIDAR system measures the signal of the reflected light, regardless of angle or background. It infers distance from the signal strength and speed from making repeated measurements.

---Which of these practical issues require automotive LIDAR systems to have a wider vertical angular field of view than preferred, and thus increase their cost?

The automobile pitches up as you accelerate rapidly.

The automobile pitches down when you press hard on the brakes and decelerate.

---P_DOUTread = 15,000 counts for the Silicon Microstructures SMI-1A digital pressure sensor. What is Pread in mm of Hg? (Type in a one-decimal number)

328.8

---According to the online article “Semiconductor Temperature Sensors Challenge Precision RTDs and Thermistors in Building Automation” by Texas Instruments, it is necessary to adapt the slope of the typical characteristics to the slope of the LMT70 semiconductor temperature sensor. This process is known as gain adjustment, and requires you to calculate a gain G.

What is the value of G for use in in the equation for Vs(T), using the tabulated data in the article?

(Type in a 3-decimal number)

1.003

 

---Which of these items below will decrease the flow rate of fluid flowing through the intravenous tube?

Increasing the flow resistance of the restrictor in place at the injection site.