QHYCCD

QE of QHY183C

QiuHY

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QE of QHY183C
« on: August 21, 2016, 01:06:36 PM »
Hello,

          I always get the question to ask the absolutely QE of QHY183C.  Unfortunately sony has not release the absolutely QE of their CMOS sensor. There is only the relativity QE curve on the datasheet.

          But here I can give another BSI sensor's QE for an reference. And then we may guess what's the QE of the QHY183C sensor.

          The reference QE is an aptina BSI sensor  AR1820. Please check the QE curves, It is the absolute QE curve, Since this sensor is only 1.25um pixel size. So we should guess the IMX183(2.4um) QE should similar or even higher than that if the SONY BSI techology is not bad than Aptina.

          Just a reference. Welcome to discussing for this topic here.

Best regards,
Qiu Hongyun
Qiu Hongyun

Re: QE of QHY183C
« Reply #1 on: August 21, 2016, 01:31:36 PM »
80% is pretty high, likely this Aptina sensor is doped more - getting more QE for more dark current. Sony seems to be around 75-80% for mono (IMX249 getting 80% according to PGR) combined with very low read noise and dark current. IMX249 as color reaches 74% where as AR0134 being higher Aptina in their charts is 62%. So green for IMX183 is likely 7X% in QE.

In the end no matter if it's 70-80% - much lower read noise is what makes the difference. IMX224 color revolution didn't come from higher QE but vastly lower read noise.
« Last Edit: August 21, 2016, 01:37:59 PM by riklaunim »

QiuHY

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Re: QE of QHY183C
« Reply #2 on: August 21, 2016, 01:54:28 PM »
IMX183 sensor relativity QE curve. This is not the absolutely QE curve . Just the normalization QE.
Qiu Hongyun

QiuHY

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Re: QE of QHY183C
« Reply #3 on: August 21, 2016, 01:56:21 PM »
80% is pretty high, likely this Aptina sensor is doped more - getting more QE for more dark current. Sony seems to be around 75-80% for mono (IMX249 getting 80% according to PGR) combined with very low read noise and dark current. IMX249 as color reaches 74% where as AR0134 being higher Aptina in their charts is 62%. So green for IMX183 is likely 7X% in QE.

In the end no matter if it's 70-80% - much lower read noise is what makes the difference. IMX224 color revolution didn't come from higher QE but vastly lower read noise.


Yes.Also the 183 sensor has very low readout noise also. Please see here
Qiu Hongyun

Re: QE of QHY183C
« Reply #4 on: August 21, 2016, 06:45:36 PM »
Yes.Also the 183 sensor has very low readout noise also. Please see here

Now that's pretty "I nee a lot of gain" chart ;) High conversion gain sensor like the others from the family.

Re: QE of QHY183C
« Reply #5 on: September 26, 2016, 03:25:50 PM »
IMX183 sensor relativity QE curve. This is not the absolutely QE curve . Just the normalization QE.

Dear QiuHY,

actually, the curves you show here, which are taken from the Sony datasheet, are not related to the quantum efficiency. They give the relative response, which is something along the lines of gray value per photon energy. If you want to show the real (but still normalized) quantum efficiency curve you need to multiply each point on the curve by the inverse of the wavelength of that point.

Kind regards