Nuvoton TOF KHKT001 - Principle of Time of Flight

The distance measuring principle for KHKT001-EVM is based on the Time of Flight concept
as shown in the figure below:
Sensor
IR-LD/Dr
10m9m8m0m
8m
9m
10m
10m
10m10m10m
3D image
Sensor Output (RAW)
TOF module
Ranging target
T
P
Emitted
light
S0
BG
BG
BG
S0' exposure
S0=S1‘-S2’
S1' exposure
S1=S1‘-S2’
S2‘ exposure
Δｔ
Received
light
Depth Calculation
S1
11m
ISP &
Controller
Δt : Time of Flight
C : Light speed
T
P
: IR pulse width
S0'
S1'
S2'
Images
IR image (S0 + S1)
Camera Output
Principle of Time of Flight
11