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

Temperature compensated optical system based on a diffractive optical element

A diffractive optical element, diffraction angle technology, applied in the field of optical systems

Inactive Publication Date: 2005-08-03
KAMSTRUP
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is not a problem when having large detectors, but is a serious problem when inserting narrow apertures in order to reduce crosstalk and limit the measurement volume

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
  • Temperature compensated optical system based on a diffractive optical element
  • Temperature compensated optical system based on a diffractive optical element
  • Temperature compensated optical system based on a diffractive optical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] As described above, the present invention relates to an optical system that compensates for variations in the emission wavelength of a light source such as a laser diode. Such wavelength fluctuations may be caused by temperature changes or mode hopping.

[0042] According to the invention, wavelength compensation is provided by making the diffraction angles of the transmitter and receiver parts the same. Thus, backscattered light generated by particles passing through the measurement volume is collected by the receiver lens and diffracted in the opposite direction of the incident collimated laser beam from the laser diode. As shown in Figure 4. A small problem arising from the configuration shown in Figure 4 is that the light collected and diffracted by the receiver section must be spatially separated from the incident collimated laser beam. This can be accomplished in many different ways.

[0043] figure 1 and the embodiment shown in Fig. 4 are based on the use of ...

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 present invention relates to an apparatus for the determination of a condition or state of an object based on quasi-elastic interaction between the object and light transmitted to the object, the apparatus comprising a diffractive optical element having a diffracting region comprising a first diffracting structure for diffraction and focussing of a first light beam to the object, and a second diffracting structure that is laterally displaced relative to the first diffracting structure for diffraction and focussing of a second light beam to the object. The first and second diffracting structures focus the first and second light beams in the same focussing plane, the focussing plane being substantially perpendicular to propagation directions of the first and second light beams. The diffracting region further comprises a receiving diffracting structure for diffraction of light from the light beams that has interacted with the object. The diffracted light is diffracted in a diffraction angle. The size of the diffraction angle is substantially equal to the angle of incidence of the incoming light beam.

Description

technical field [0001] The invention relates to an optical system that compensates for variations in the emission wavelength of eg laser diodes. Such wavelength changes may be caused by temperature changes or modehops. The system according to the invention is provided by making the diffraction angles of the transmitter and receiver parts the same. Background technique [0002] The idea of ​​implementing all optical functions of a laser time-of-flight velocimeter (LTV) in a single diffractive optical element (DOE) has been proposed in EP0770219. The system of EP0770219 is used for velocity measurements on solid surfaces. The main advantage of this system is that the calibration of the system is inherent in the diffractive optical element and to a first approximation is independent of the wavelength and thus enables the use of cheap and unstable laser diodes. [0003] LTV system in figure 1 is schematically shown. A collimated beam originating from a laser diode with a co...

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): G01P3/36G01P3/68G01P5/20G01S7/481G01S7/497G01S17/58
CPCG01S7/497G01P3/68G01P5/20G01S7/4811G01P3/36G01S17/58
Inventor C·达姆-汗森
Owner KAMSTRUP