Read-level reconstruction
Chronological nondestructive reads were converted into interval-rate products with data-quality-aware masking.
Example technical review - public data
When a changing background looks like a detector problem
Public Hubble HgCdTe data were used to separate detector response from a time-varying background. The distinction changed the reconstructed count rate and the physical interpretation of the anomaly.
This is an example deliverable. Brooks Photonics provides comparable independent analysis for client-supplied detector measurements, tailored to the device, available data, and engineering decision.
View the pinned analysis source and data manifest- 53.85%
- Peak left-right asymmetry
- 700 s
- Background transient duration
- 0.111
- Count-rate correction
Engineering question
Was the detector changing, or was the background changing?
The early affected reads contained a strong left-right gradient. That feature became visually weak by interval 4, but visual stabilization did not establish temporal stability.
The analysis therefore treated spatial structure and detector-wide common-mode behavior as separate acceptance tests. A matched nominal exposure provided the control needed to distinguish scene-independent ramp history from normal late-ramp behavior.
Spatial evolution
The dominant gradient fades before the common-mode tail ends.
The affected exposure, affected-minus-control residual, and nominal late-ramp behavior were examined at representative intervals.
Temporal diagnosis
Three affected intervals remain after visual stabilization.
Matched-control subtraction showed that the detector-wide excess remained above the stated engineering threshold through interval 6.
Analysis chain
The conclusion was tested through independent evidence paths.
Matched-control subtraction
A nominal exposure separated the transient from ordinary spatial structure and late-ramp response.
Robustness checks
Source-free masking, threshold variation, baseline variation, and a 2,000-replicate spatial block bootstrap tested classification stability.
Independent refitting
All-read and post-transient ramp fits were compared with the archived CALWF3 count-rate product.
Engineering conclusion
The image looked stable before the background transient ended.
Removing the transient reduced the reconstructed left-right asymmetry from 6.32% in the archived product to 0.40% in the post-transient fit. The post-transient source-free median was 0.11108 e-/s/pixel below the archived FLT median.
The combined temporal, spatial, control-relative, source-free, bootstrap, and refitting evidence supported a time-variable external background. An intrinsic HgCdTe material explanation was not required.
Reports and reproducibility
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