Spectral and Radiometric Design of a 3- line CCD Camera for Mars Observation
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1 Spectral and Radiometric Design of a 3- line CCD Camera for Mars Observation
2 Spectral Design Requirements: spectral range bandwidth spectral characteristics Design: 1. first approach by filter selection from catalogues 2. modelling of the spectral system response (contains spectral characteristics of the sensor and optical systems) 3. fine tuning of bandwidth, centre wavelength and spectral system characteristics Filter selection: wide spectral bandwidth - glass filters narrow bandwidth - interference filters Raumfahrttechnik 2
3 Spectral Design Institut für Luft- und Raumfahrt Glass Filters Advantages: Disadvantages: - low impact of inclined entrance - limited filter assortments ray - very limited bandpass - robustness and long-term stability characteristics feasible - high transmission in a large - fine tuning not possible bandwidth Interference Filters Advantages: Disadvantages: - any narrow bandwidth feasible - near parallel incidence - spectral fine tuning feasible of light required -low mass -sensitive against - steep edges in the spectral environmental impacts characteristics feasible - additional glass blocking filters necessary Raumfahrttechnik 3
4 Theoretical (line) and measured (+) transmission of WAOSS filters λ in nm Nadir line filter combination: 1mm KG1 + 1mm BG38 Raumfahrttechnik 4
5 Spectral System Response of WAOSS Nadir and Stereo Channels R [V/µJ-nm-sr] λ in nm Stereo line filter combination: 1mmKG1 + 1mm OG570 Raumfahrttechnik 5
6 Basic Requirements: signal-to-noise-ratio dynamic range and the image quality Radiometric Design Radiometric design is supported by models: a target model (for instance of the Martian surface and atmosphere), a sensor model a model of distortions Raumfahrttechnik 6
7 Radiometric Design Signal Estimation 6 Ld i µw 4 cm 2. nm. sr Lb i λ( i) nm Model of spectral radiances of bright (Arabia) and dark (Syrtes Major) Mars regions Raumfahrttechnik 7
8 Radiometric Design Sensor Model and Signal Estimation Institut für Luft- und Raumfahrt s i ld π cos( ε ) λ 2 = t T ( λ) R ( λ) L ( λ) dλ + σ int 2 2 opt i i λ 1 4k K(1 + M ) signal + σ system with k = 4.5 (F-number, f/aperture) K = 1.44µV/el (conversion factor) M = f/h (scale factor) ε = view angle of pixel i ld = 3.82 (limb darkening of lens) Topt(λ) = Transmission of lens and filters R(λ) = Responsivity of the CCD L(λ) = input radiance Raumfahrttechnik 8
9 Radiometric Design Noise sources photons+ photon noise responsivity + PRNU sensor analog electronics analog-digital converter x + x + x + digital numbers noise noise quantization +dark gain + noise signal channel mismatch converting Model of the main noise sources of the CCD sensor system Raumfahrttechnik 9
10 Radiometric Design Simplified noise model of a CCD sensor system photons+ photon noise total gain x + fixed pattern noise Raumfahrttechnik 10 + total system noise digital numbers Main system noise sources: a pixel-related multiplication factor (gain or relative photo response of the pixel i) the signal dependent photon noise the fixed pattern noise of the CCD the temporary total system noise (r.m.s. noise)
11 Radiometric Design Signal to Noise Ratio SNR Institut für Luft- und Raumfahrt SNR = s i + s i σsystem 2 ma with s i = sensor signal ma = macro pixel factor σ system = total system noise, transformed at sensor input Raumfahrttechnik 11
12 Radiometric Design Signal to Noise Ratio SNR 1000 Institut für Luft- und Raumfahrt SRV( PRNU) SRV0( PRNU) PRNU SNR in dependance of PRNU at a system noise of 235e- for two full-well options: FW=400000e- and e- % Raumfahrttechnik 12
13 RADIOMETRIC DESIGN Dynamic Range Institut für Luft- und Raumfahrt DR = FW ADS t 2 2 σ +σ fp system int with FW = full well of sensor pixel ADS = average dark signal σ fp = fixed pattern noise of dark signal σ system = total system noise, transformed at sensor input Raumfahrttechnik 13
14 Dynamic Range DR1( DSNU) DR2( DSNU) DSNU 1000 DSNU in % Dynamic Range in dependance of DSNU at tint = 10ms and 30ms and at a system noise of 235e- Raumfahrttechnik 14
15 Evaluation by MTF: MTF = OTF System MTF: with RADIOMETRIC DESIGN Image Quality OTF = F{PSF} MTF sys = MTF opt MTF CCD MTF blu MTF el MTF opt = MTF optics and filters MTF CCD = MTF of CCD MTF blu MTF el = MTF of blurring = MTF of electronics for WAOSS optics 21.7mm f/4.5 within nm: MTF sys MTF diffr MTF aber MTF pix Raumfahrttechnik 15
16 RADIOMETRIC DESIGN Image Quality MTFaber ν MTF diffr ( ν ) 0.6 MTF pix ( ν ) 0.4 MTFsys ν ν at λ= 650nm: νcut= 342 lp/mm (diffraction limit) νpix= 71.4 lp/mm Raumfahrttechnik 16
17 Summary 1. The geometric design starts with computing of all non-given geometric parameters from the requirements. 2. The spectral design is characterized by an iteration process with consideration of all spectral components (optics, filters, sensors). Glass filters are used for the determination of wide spectral bands and at wide filed of view requirements. 3. The radiometric design includes a parametric sensor model model signals from the target objects noise models for signals and instrument the conversion into digital numbers the estimation of the signal-noise-ratio the estimation of the dynamic range a MTF system evaluation. Raumfahrttechnik 17
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