Secondary electron conduction camera tube for space applications

C. Kunze; H. Samuelsson

doi:10.1364/AO.15.000661

Applied Optics
Vol. 15,
Issue 3,
pp. 661-667
(1976)
•https://doi.org/10.1364/AO.15.000661

Secondary electron conduction camera tube for space applications

C. Kunze and H. Samuelsson

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C. Kunze and H. Samuelsson, "Secondary electron conduction camera tube for space applications," Appl. Opt. 15, 661-667 (1976)

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Abstract

A camera tube based on the SEC (secondary electron conduction) effect has been developed for space applications. The background to the initiation of this development is briefly mentioned and anticipated applications are reviewed. These comprise the use as a detector in astronomical instruments (cameras and spectrographs), in a star field camera, and in special instruments for earth observation. The tube construction is described where it concerns the modifications made to the original standard tube produced by the firm Heimann GmbH. Finally, a first assessment of the tube performance is summarized as measured in a standard test facility operating in the standard European scan format.

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General
Envelope	Glass with a ceramic target section
Dimensions	See Fig. 3
Mass	Approximately 200 g (excluding coil assembly)
Power consumption	1.8 W (excluding coil assembly)
Image section
Input window	Fiber optics with fiber diameter approximately 7 μm
Useful diameter	21 mm
Front surface flatness	Approximately 10 μm
Curvature of photocathode	18-mm radius
Photocathode	S-11
Focusing	Electrostatic
Magnification	1:0.95
Target
Substrate	Al₂O₃ foil
Active material	Porous KCl
Electrode	Al
Target mount	See Fig. 5
Reading section
Focusing	Magnetic
Deflection	Magnetic
Recommended coil assembly	BV 612
Cathode	BaO
Defining aperture	15 μm demagnified on target approximately 2:1
G3 electrode	Al evaporated on inside of glass envelope. Silver coating for contact
G4 electrode	17-μm copper mesh 2–3 mm from target
G5	None

	Test conditions	Measured value
Photocathode sensitivity	λ = 470 nm	>35 mA/W
Resolution (modulation depth)	center, 24 lp/mm, I_s = 200 nA	≃50%
	center, 37 lp/mm, I_s = 200 nA	estimated 5%
	edge, 25 lp/mm, I_s = 200 nA	≃5%
Integration time	7 kV	15 h
Target gain	I_s = 50 nA	150
Maximum output Signal	γ = 0.7	300 nA
Residual signal	3rd field	<5%
Geometrical distortion		2–3%
Uniformity of response	within 40% of radius full field	±5%
Uniformity of response	within 40% of radius full field	–20%

General
Envelope	Glass with a ceramic target section
Dimensions	See Fig. 3
Mass	Approximately 200 g (excluding coil assembly)
Power consumption	1.8 W (excluding coil assembly)
Image section
Input window	Fiber optics with fiber diameter approximately 7 μm
Useful diameter	21 mm
Front surface flatness	Approximately 10 μm
Curvature of photocathode	18-mm radius
Photocathode	S-11
Focusing	Electrostatic
Magnification	1:0.95
Target
Substrate	Al₂O₃ foil
Active material	Porous KCl
Electrode	Al
Target mount	See Fig. 5
Reading section
Focusing	Magnetic
Deflection	Magnetic
Recommended coil assembly	BV 612
Cathode	BaO
Defining aperture	15 μm demagnified on target approximately 2:1
G3 electrode	Al evaporated on inside of glass envelope. Silver coating for contact
G4 electrode	17-μm copper mesh 2–3 mm from target
G5	None

	Test conditions	Measured value
Photocathode sensitivity	λ = 470 nm	>35 mA/W
Resolution (modulation depth)	center, 24 lp/mm, I_s = 200 nA	≃50%
	center, 37 lp/mm, I_s = 200 nA	estimated 5%
	edge, 25 lp/mm, I_s = 200 nA	≃5%
Integration time	7 kV	15 h
Target gain	I_s = 50 nA	150
Maximum output Signal	γ = 0.7	300 nA
Residual signal	3rd field	<5%
Geometrical distortion		2–3%
Uniformity of response	within 40% of radius full field	±5%
Uniformity of response	within 40% of radius full field	–20%

Abstract

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Tables (2)

Applied Optics