chapter 6, e⁻/DN Variance

from: Photon Transfer

Author(s): James R. Janesick

Published: 14 August 2007

Chapter DOI: http://dx.doi.org/10.1117/3.725073.ch6

Chapter Page Count: 7 pages

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Front Matter

1. Introduction

2. Photon Interaction

3. Photon Transfer Noise Sources

4. Photon Transfer Theory

5. Photon Transfer Curve

6. e⁻/DN Variance

7. Nonlinearity

8. Flat Fielding

9. Modulation Photon Transfer

10. Signal-to-noise Performance

11. Read Noise

12. Lux Transfer

A. PTC Data Reduction Example

B. PTC Simulation Program with Thermal Dark Current

C. PTC Simulation Program with FPN Removal through Flat Fielding

D. LTC Simulation Program with Thermal Dark Current

Back Matter

Preview

Excerpt

This chapter derives a formula used to determine the measurement accuracy of K_ADC(e⁻/DN). To show the error's origin graphically, a shot noise PTC plotted on linear scales is presented in Fig. 6.1. The data were simulated using a random number generator based on a 500-pixel subarray. The data points are scattered about the ideal solid shot noise curve; the variance in data about the curve reflects upon the error in measuring K_ADC(e⁻/DN). A histogram of K_ADC(e⁻/DN) with a standard deviation of 0.645 is shown in Fig. 6.2. The histogram in Fig. 6.3 shows an improved standard deviation of 0.141 DN when 10,000 pixels are sampled. These results suggest that the uncertainty in ADC sensitivity decreases by the square root of the number of pixels sampled. It would also be informative to know how read noise and signal level influence measurement accuracy. The analysis below includes these variables when K_ADC(e⁻/DN) variance is calculated.