zenglu
zenglu 1. The flight time is the emission of the surface light source.
The "flight time" refers to the time it takes for a rectangular light pulse to travel from the transmitter (VCSEL) to the object and back to the sensor.
zenglu 2.OAK-FFC-TOF-33D is iToF, usually emitting a single beam of light, but this beam of light will diffuse through optical components to cover the entire scene.
Yes, the OAK-FFC-TOF-33D uses a flood illumination approach, meaning the entire scene is illuminated at the same moment.
zenglu 3. Light source: It is usually one or more infrared LED or VCSEL lasers.
Yes, the light source operates at 940 nm infrared wavelength.
zenglu 4. Emission method: The light emitted from the light source will immediately pass through a diffuser or optical lens, converting a narrow laser beam into a uniform, wide-angle "spot" or "surface light source", illuminating the entire target scene at once.
Correct — the emitted light passes through an optical diffuser or lens to form a wide, uniform illumination pattern.
zenglu 5. Working principle: This is like turning on a flashlight (especially one with a softbox) instead of scanning with a laser pointer.
Yes, it uses cross-correlation to calculate the phase delay, which determines the time of flight (ToF).
zenglu The entire scene is illuminated simultaneously, and the sensor (CMOS pixel array) receives the reflected light from the entire scene at the same time.
Yes, however, note that the readout is not exactly simultaneous — it functions somewhat like a rolling shutter, but the delay is extremely small.
The maximum measurable distance is about 1.5 m at 100 MHz modulation and 1.8 m at 80 MHz.
To resolve actual distance, two modulation frequencies are combined using their greatest common divisor (GCD), which introduces a slight delay between the two frequency frames and can cause minor motion blur.
Thanks,
Jaka
