RAMOT at Tel Aviv University Ltd.

Athermalization of infra-red lenses via optical phase mask with no performance degradation at nominal conditions

Posted by RAMOT at Tel Aviv University Ltd.Responsive · Innovative Products and Technologies · Israel

Summary of the technology

Athermalization of infra-red lenses via optical phase mask with no performance degradation at nominal conditions
Project ID : 7-2013-530

RAMOT at Tel Aviv University Ltd.

Technology
Infra-red (IR) imaging (in the LWIR and MWIR bands) is widely used for observation and surveillance applications. Most of IR optical materials are very sensitive to temperature changes. This sensitivity is reflected in a temperature dependent refractive index, that in turn it affects the focal length. In order to manufacture a stable IR lens, this problem needs to be solved (the solutions are referred as 'IR lens Athermalization').

Need and Advantages
There are some approaches and solutions to IR lens athermalization. The active approach solves the problem by refocusing the optical system using motors. If one desires not to use motors, there are also passive solutions, which use mixture of optical/mechanical materials, which in tandem create a temperature stable focal length. However, these solutions require the usage of exotic materials and also a complex opto-mechanical design. All of the known solutions are not suitable for low-cost applications where a simple solution is sought. Our proposed solution is a full-passive all-optical solution, based on incorporating a phase element (mask) along the optical path, which compensates for the thermal effects. It is inexpensive and does not require moving components, thus attractive for surveillance applications in remote locations. Moreover, unlike other masks that reduce the performance of the imaging system at the nominal temperature, our mask does not deteriorate the image quality at the nominal temperature and improves it very much at other temperatures (see Fig.).

Potential Application


The proposed solution can be applied to any IR imaging system, but it is particularly suitable for low-cost systems, where a simple and passive solution is needed. Ideal for IR cameras deployed unattended and without active control.

Stage of Development
This project has been analyzed theoretically as well as in computer simulations. Testing it in IR imaging systems is under consideration.

Patents
Patent pending

Project manager

Oren Calfon
VP Business Development, ICT

Project researchers

Emanuel Marom
T.A.U Tel Aviv University, Engineering
Physical Electronics

Naim KONFORTI
T.A.U Tel Aviv University, Engineering
Physical Electronics

Harel Haim
T.A.U Tel Aviv University, Engineering
Physical Electronics

Shay Elmalem
,

Related keywords

  • Electronics, Microelectronics
  • Data Protection, Storage Technology, Cryptography, Data Security
  • Electronic circuits, components and equipment
  • Security systems
  • Engineering
  • Defence communications
  • Electronic Components
  • Electronics Related Equipment
  • Some other electronics related
  • Other (uncategorised)
  • Defense and Security
  • Electronics and Electro-Optics
  • optical systems
  • Electronics and Electro-Optics
  • devices

About RAMOT at Tel Aviv University Ltd.

Technology Transfer Office from Israel

Ramot is Tel Aviv University's (TAU) technology transfer company and its liaison to industry, bringing promising scientific discoveries made at

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