Tapered Light Reflective System

Schlieren Imaging Principle Introduction

schlieren method, also known as the Schlieren (schlieren) method, is a classic optical display technology. The basic principle is to use the principle that the refractive index gradient of light in the measured flow field is proportional to the airflow density of the flow field, and the change of the density gradient in the flow field is transformed into the change of the relative light intensity on the recording plane, so that the area with severe density changes such as shock wave and compression wave in the compressible flow field becomes an observable and distinguishable image, which is recorded. The combination of a high-speed camera with high time resolution and the method of shading becomes a high-speed shading method. In the physical experiments of detonation and shock wave, the method is used to show the flow field, the shock wave front and its propagation in transparent media, to observe the micro-material ejection from the free surface under high pressure, the wave system on the interface, the interface instability and the development of weak shock waves such as spark discharge under high pressure.

Ruiguang Cage (Zhenjiang) Optoelectronic Technology Co., Ltd. is committed to the integration of domestic high-end instruments. The grain shadow system introduced by building block structure has simple structure, stable system, convenient installation and simple debugging. The open building block structure enables the system to change the system configuration according to the actual application scene.

system composition

concave reflector: diameter 203mm; focal length F = 750mm;
Gliography head: light source blade integrated module, industrial camera, imaging module, three-position adjustment displacement stage;
Support: building block structure support.

System customization: According to different experiments and field conditions, can provide customized shadow solutions

Concave Mirror Parameters

material is K9 glass;
Stress ≤ 1;
Vacuum aluminum reflective film is plated, and then one layer of silicon dioxide protective film is plated;
Reflection coefficient ≥ 85%;
Surface accuracy: the surface type error of the main mirror is ≤ & lambda;/20;
Fixed bracket material: aluminum alloy 6061- T6, stainless steel;
Optical axis height: the distance between the center of the primary mirror and the center of the bottom plate is more than 150mm (the height can be adjusted).

grain head parameters

Blade
Cutting edge width: 10mm
light source
LED white light power 3W, can be triggered externally as stroboscopic light source (0 to 50KHZ,SMA interface external trigger),Type-C interface 5V/2A; Center height of light source system support base: 150mm (height adjustable, equal to center height of concave mirror).
image acquisition interface
Camera: 4K camera.
Main technical parameters:

Sony IMX334 Sensor

● Sensor size 1/1.8 inch
● Pixel size 2.0 & micro;m× 2.0 & micro;m
● Image output: 2592*1944 @ 30fps,1920*1080 @ 60fps
● Output protocol: HDMI, USB protocol
● Lens interface: CS/C
● Input voltage: DC 12V