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3D Sensing ToF(Flash LiDAR) Equipment

3D sensing ToF (Flash LiDAR) ​​


3D sensing ToF (Flash LiDAR) sensor is a sensor that uses the flight time of light to measure distance and perform 3D mapping and imaging. 3D sensing is largely divided into SL (Structured Light) and ToF (Time of Flight) methods. The SL method is mainly advantageous in short distances, and the ToF method is advantageous in long distances. The ToF sensor consists of a laser light source, optical system, image sensor, and signal processing circuit. The laser light source mainly uses VCSEL (Vertical Cavity Surface Emitting Laser), and the optical system irradiates the laser beam to the subject and focuses the reflected light on the image sensor. Optical systems may consist of lenses, diffusers, filters, etc. Image sensors mainly use SPAD (Single Photon Avalanche Diode) pixels and obtain distance information by detecting the time difference in reflected light. The signal processing circuit amplifies, converts, and filters the signal from the image sensor and outputs the final distance data.

ToF in-line inpection flow chart

Below are the optical components of the 3D sensing ToF (Flash LiDAR) sensor; This is equipment for measuring light distribution and electro-optical characteristics of lenses, diffusers, VCSELs, etc., and consists of an integrating sphere, temperature control module, pulse power supply, optical power meter, or spectroscopic analyzer. LIV measurement is a method of measuring the relationship between voltage-current-light output of a ToF sensor, and Field of Illumination (FoI) is used to evaluate the light emission distribution of a laser and the light scattering characteristics and performance of optical components.

​For more information on the analysis of electrical-optical characteristics, please refer to the following link.


FoI measurement(Conoscope)
Vcsel FoI Conoscope

This is a method of measuring the light quantity distribution of the optical components lens, diffuser, VCSEL, etc. of the surface-emitting laser of the ToF sensor using a conoscopic optical system. It is a method of measuring the light quantity distribution on a plane perpendicular to the optical axis of the surface-emitting laser. , high-precision measurement is possible.


LIV Measurement(IS)

Flash ToF LIV

LIV is a graph representing the optical power-current-voltage characteristics of a laser device and is used to evaluate the performance of VCSEL. LIV can measure critical current, efficiency, wavelength, spectrum, etc., and requires equipment such as an integrating sphere, temperature control, optical power meter, or spectrometer.


FoI Measurement(In-line)
QC Flash ToF FoI

The imaging screen method, which is one of the FoI (Field of Illumination) measurement methods, places a screen on a plane parallel to the optical axis of the surface-emitting laser and measures the light quantity distribution projected on the screen by taking pictures with a camera, making it a low-cost mass production process. , high-speed measurement is possible.


FoI measurement(Goniometer)
Goniometric ToF FoI

A method of measuring the light quantity distribution using a rotating optical system centered on the optical axis of a surface-emitting laser. Precise, accurate, and reliable measurement of not only the light emission distribution but also the electrical characteristics such as pulse characteristics, wavelength, optical output, voltage, and current of the laser diode. This is possible.

Spectroscopic BSDF

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