Unlock instant, AI-driven research and patent intelligence for your innovation.

Micro hourglass type polarization detection camera

An hourglass-type, micro-polarization technology, applied in the field of micro-hourglass-type polarization detection cameras, can solve the problems of poor real-time performance, insufficient spatial resolution of complex polarization state detection, and increased instrument volume.

Inactive Publication Date: 2020-04-10
BEIHANG UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the typical disadvantages of these devices are: since the polarizer needs to be rotated to detect the polarization direction, the polarization direction can only be obtained by at least one rotation, and the real-time performance is poor; although the multi-channel measurement scheme can improve the detection speed, it will increase the size of the instrument. Insufficient spatial resolution for detection of complex polarization states
Another solution is to use time or space modulation to achieve mechanical rotation-free, but the corresponding technology is relatively complicated and the cost is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Micro hourglass type polarization detection camera
  • Micro hourglass type polarization detection camera
  • Micro hourglass type polarization detection camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The principle diagram of a micro-hourglass type polarization detection camera provided by the present invention is as follows: figure 1 As shown, the core part lies in the design of the photosensitive surface of the camera and the decoupling method of polarization information. The micro-polarization detection unit on the photosensitive surface of the camera is divided into two layers: one layer is the pixel layer, and the other layer is the detection layer. The pixel layer contains four pixel points, which are recorded as I, II, and III and IV; the detection layer is located above the pixel layer, and the incident light is irradiated onto the pixel layer through the detection layer; among the four pixel points in the pixel layer, one pixel point is covered by a non-transparent coating, so that only Half of the light is able to pass through;

[0020] PAF (polarization axis finder) or S-waveplate can be used as the detection layer of the basic detection unit. The centers...

Embodiment 2

[0029] Embodiment 2 of a micro-hourglass type polarization detection camera provided by the present invention is as follows: figure 2 As shown, the difference between Embodiment 2 and Embodiment 1 is that the pixel layer of the micro-polarization detection unit on the photosensitive surface of the camera only contains three pixels, which are distributed in the shape of "pin", taking the S-wave plate as an example , the light intensity of the outgoing light is shown in the following formula:

[0030]

[0031] In the formula, K is the magnification, d is the polarization degree of the incident light, θ is the azimuth angle of the incident light, and φ is the polarization angle of the incident light.

[0032] Such as figure 2 The light intensity collected by the three pixels on the pixel layer of the imaging units numbered Ⅰ, Ⅱ and Ⅲ is shown in the following formula:

[0033]

[0034]

[0035]

[0036] By solving the above equation, the polarization degree d of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a micro hourglass type polarization detection camera. Polarization information is obtained through a micro-polarization detection unit on the photosensitive surface of the camera, the micro-polarization detection unit is divided into two layers, one layer is a pixel layer, the other layer is a detection layer, the detection layer is located above the pixel layer, and incident light irradiates the pixel layer through the detection layer; one of four pixel points in the pixel layer basic imaging unit is shielded by the non-light-transmitting coating, so that only half of light can pass through the pixel layer basic imaging unit; the detection layer can be composed of a local polarization device such as PAF or a device with phase delay of half wavelength such as S-waveplate, and when the S-wave plate is used as the detection layer, a linear polarizer needs to be added between the S-wave plate microarray and the camera pixel layer array. Therefore, after the polarized light irradiates the detection layer, the light intensity distribution of the emergent light conforms to the Malus law; and according to the intensity information of the four pixel points in the pixel layer, decoupling is performed to obtain the polarization direction and the polarization degree of the incident light.

Description

technical field [0001] The invention relates to the field of polarization detection, in particular to a micro-hourglass type polarization detection camera. Background technique [0002] By collecting the polarization state of the light reflected or emitted by the object, information such as the physical, biochemical, and spatial distribution of the object can be obtained. Therefore, polarization detection is widely used, and it can be used in sky polarization navigation, polarization imaging, stress detection, and optical activity. In terms of material detection and other aspects, the basic principle is realized by extracting the polarization information reflected by the target. The basic physical principle used for polarization detection is to convert a change in polarization direction into a change in light intensity using Malus' law. The principle of a typical polarization detection device is: let the polarized light pass through the rotating polarizer, and obtain the po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01J4/00
CPCG01J4/00G01J4/04
Inventor 张蓓王希奇朱昕昀
Owner BEIHANG UNIV