System and method for holographic co-axis and off-axis reproduction of light path in particle field

Abstract

The invention particularly relates to a system and a method for holographic co-axis and off-axis reproduction of a light path in a particle field. The system comprises a light source beam expansion and collimation system, a reflector system, a reproduction collection system and an optical axis adjusting auxiliary system, wherein the light source beam expansion and collimation system comprises a reproduction light source, a beam expansion lens, a filtering pin hole and an collimation lens which are sequentially arranged along the light path; the reflector system comprises a whole reflector I and a whole reflector II; the reproduction collection system comprises a holographic dry plate, an imaging objective lens, a collection camera, a bracket I, a bracket II, a movable platform controller and a control computer; the optical axis adjusting auxiliary system comprises a helium-neon laser device, a diaphragm, a cross circle half target and a cross circle whole target. The system has the advantage that the purpose that holographic co-axis and off-axis reproduction systems share most of the light path in the particle field is realized, and the suitability is improved.

Description

technical field [0001] The invention relates to the field of particle field pulsed laser holographic measurement, in particular to a particle field holographic on-axis and off-axis reproduction optical path system and method. Background technique [0002] Particle field pulsed laser holographic measurement (referred to as "particle field holographic measurement") is the use of pulsed laser holographic imaging methods to measure a large number of tiny particles (such as atomized water droplets, oil droplets, detonation particles, tiny plankton and dust) produced by a certain mechanism. etc.), a technology for quantitative measurement of parameters such as spatial distribution, particle size, and velocity, which is currently a major application field of laser holography. [0003] The recording methods of particle field holography include coaxial and off-axis. The specific optical path is as follows: figure 1 and figure 2 shown. Coaxial recording uses expanded and collimate...

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to achieve both on-axis and off-axis reproduction on one optical path

For laboratories that often perform different holographic recording methods (coaxial recording or off-axis recording), it is necessary to arrange both coaxial and off-axis reproduction optical paths at the same time, or use only one set of optical elements to repeatedly build the two reproductions. This will not only increase the cost of the experiment, but also waste the time and energy of researchers

[0012] 2. There is a problem of diffraction field translation in the off-axis reproduction optical path

But this method is more complicated, and when the angle between the object light and the reference light in the holographic recording is different, the diffraction angle of the diffraction field is different, and the movement amount of the reverse compensation is also different, which is not convenient in practical application

[0013] 3. The original off-axis reproduction optical path layout is difficult

Since the optical axis of the reproduced light in this reproduced optical path structure is determined, this included angle cannot be corrected, and the resulting error cannot be avoided

[0018] e) The original off-axis reproduction optical path has poor adaptability

The original reproduction optical path structure is only applicable to the situation where the angle between the object light and the reference light is fixed. If the angle between the object light and the reference light changes in different experiments, the entire reproduction optical path needs to be readjusted.

Images