Which of the following is a type of microwave detector?

Frequency-modulated continuous wave (FMCW) is indeed a recognized type of microwave detector. This technology is widely used in various applications, particularly in radar systems, where it helps improve the detection of objects by measuring the frequency shift of a signal reflected off a target.

FMCW radar transmits a frequency-modulated signal that continuously varies in frequency over time. When this signal hits an object and reflects back, the change in frequency due to the Doppler effect allows the system to calculate the distance to the object as well as its speed. This makes FMCW highly effective for applications such as speed detection, level measurement, and object tracking.

Other options, while related to microwave technology, serve different purposes or use different principles. For instance, amplitude modulation involves altering the strength of a signal and does not specifically pertain to the microwave detection category like FMCW. Pulsed radar uses short bursts of radio waves to detect objects, which differs from the continuous signal used in FMCW. Continuous wave radar measures the reflection of a continuous wave but lacks the frequency modulation aspect that distinguishes FMCW.

Understanding the principles and applications of each type of detection is essential for recognizing the unique advantages of FMCW in microwave sensing and detection technologies.