Mr. Myles Sherman Profile

Myles Sherman

at Caltech

SPIE Involvement:

Author

Publications (2)

Proceedings Article | 29 August 2022 Presentation + Paper

Characterization of low light performance of a CMOS sensor for ultraviolet astronomical applications

Timothee Greffe, Roger Smith, Myles Sherman, Fiona Harrison, Hannah Earnshaw, Brian Grefenstette, John Hennessy, Shouleh Nikzad

Proceedings Volume 12191, 121910E (2022) https://doi.org/10.1117/12.2629198

KEYWORDS: Sensors, Cadmium sulfide, Photons, CMOS sensors, Ultraviolet radiation, Video, Charge-coupled devices, Monte Carlo methods, Interference (communication), Astronomy

Read Abstract +

SPIE Journal Paper | 22 April 2022

Characterization of low light performance of a complementary metal-oxide semiconductor sensor for ultraviolet astronomical applications

Timothee Greffe, Roger Smith, Myles Sherman, Fiona Harrison, Hannah Earnshaw, Brian Grefenstette, John Hennessy, Shouleh Nikzad

JATIS, Vol. 8, Issue 02, 026004, (April 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.026004

KEYWORDS: Sensors, Semiconductors, Cadmium sulfide, Ultraviolet radiation, Charge-coupled devices, CMOS sensors, Photons, Video, Astronomy, Switches

Read Abstract +

Complementary metal-oxide semiconductor (CMOS) detectors offer many advantages over charge-coupled devices (CCDs) for optical and ultraviolet (UV) astronomical applications, especially in space where high radiation tolerance is required. However, astronomical instruments are most often designed for low light-level observations demanding low dark current and read noise, good linearity, and high dynamic range, characteristics that have not been widely demonstrated for CMOS imagers. We report the performance, over temperatures from 140 to 240 K, of a radiation hardened SRI 4k × 2k back-side illuminated CMOS image sensor with surface treatments that make it highly sensitive in blue and UV bands. After suppressing emission from glow sites resulting from defects in the engineering grade device examined, a 0.077 me − / s dark current floor is reached at 160 K, rising to 1 me − / s at 184 K, rivaling that of the best CCDs. We examine the trade-off between readout speed and read noise, finding that 1.43 e − median read noise is achieved using line-wise digital correlated double sampling at 700 kpix / s / ch corresponding to a 1.5 s readout time. The 15 ke − well capacity in high gain mode extends to 120 ke − in dual gain mode. Continued collection of photogenerated charge during readout enables a further dynamic range extension beyond 106 e − effective well capacity with only 1% loss of exposure efficiency by combining short and long exposures. A quadratic fit to correct for non-linearity reduces gain correction residuals from 1.5% to 0.2% in low gain mode and to 0.4% in high gain mode. Cross-talk to adjacent pixels is only 0.4% vertically, 0.6% horizontally, and 0.1% diagonally. These characteristics plus the relatively large (10 μm) pixel size, quasi 4-side buttability, electronic shutter, and sub-array readout make this sensor an excellent choice for wide field astronomical imaging in space, even at far-UV wavelengths where sky background is very low.

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years