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Compact Photoconductive-Based Sampling System with Electronic Sampling

Award Information
Agency: Department of Commerce
Branch: N/A
Contract: N/A
Agency Tracking Number: 37771
Amount: $49,704.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Solicitation Year: N/A
Award Year: 1997
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
14500 Manor Park Drive
Rockville, MD 20853
United States
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Chi Lee
 () -
Business Contact
Phone: (301) 871-9012
Research Institution

Critical issues associated with the design of a rugged, compact "real time" sampling system using photoconductive switches as the signal generator and sample will be investigated. The design concept is based upon an optoelectronic equivalent time sampling principle developed by the Principal Investigator. It involves first the phase locking of the temporal waveform to be measured to the optical pulses and subsequent sampling of the locked waveform. The photoconductive switches are used both as optical-microwave mixer and sampler. The optical-microwave intermixing process generates a low frequency replica of the high frequency waveform to be sampled. The frequency ratio of these waves is the time expansion factor. Since there is no electro-mechanical moving part involved, the sampling is done at a fast rate. The record acquisition time of 10 s per sweep can be achieved. Other issues concerning electronic sampling delay, epoch time, number of sampling points per epoch, resolution time, photoconductor carrier lifetime, sensitivity, signal-to-noise ratio, dynamic range, etc., will also be investigated. A preliminary experiment demonstrating the operation principle of the equivalent time sampling will be carried out. A complete Phase II system design of a pulse parameter testing instrument which will meet most requirements as specified in Subtopic 8.7.3T will be presented at the end of Phase 1.

* Information listed above is at the time of submission. *

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