Real-time pulse-width monitor for ICCD electro-optic shutters

George J. Yates

doi:10.1117/12.273426

28 May 1997 Real-time pulse-width monitor for ICCD electro-optic shutters

George J. Yates

Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273426
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States

Abstract

A method is described for controlling and measuring the pulse width of electrical gate pulses used for optical shuttering of image intensifiers. The intensifiers are coupled to high frame rate Charge-Coupled-Devices (CCD) or Focus-Projection Scan vidicon TV cameras for readout and telemetry of time resolved image sequences. The shutter duration or gate width of individual shutters is measured in real time and encoded in the video frame corresponding to a given shutter interval. The shutter information is updated once each video frame by strobing new data with each TV camera vertical sync pulse. This circuitry is used in conjunction with commercial video insertion/annotation equipment to provide the shutter width information in alpha numeric text form along with the time resolved video image on a frame-by-frame basis. The measurement technique and circuitry involving a combination of high speed digital counters and analog integrators for measurements in the 1 ns to 1024 ns range are described. The accuracy obtained is compared with measurements obtained using high speed DSOs. The measured data are provided in 10-bit Binary (Bi) and four decades of Binary Coded Decimal and also displayed on four digit seven segment displays. The control circuitry including digital and analog input means for gate width selection are described. The implementation of both measurement and control circuitry into an Intensified Shuttered CCD radiometric system for recording fast shuttered images at RS-170 to 4 KHz frame rates is presented.

Citation Download Citation

George J. Yates "Real-time pulse-width monitor for ICCD electro-optic shutters", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); https://doi.org/10.1117/12.273426

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KEYWORDS

Cameras

Camera shutters

Mirrors

Video

Binary data

Digital electronics

Image intensifiers

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