QSI 520c Betriebsanweisung PDF herunterladen (Seite 19)

QSI 500 SERIES USER GUIDE

When using forced-air cooling the body of the camera and the window of the CCD chamber

can be up to 12ºC warmer than the surrounding ambient air temperature. By definition, the

camera will be above the dew point (or frost point) and condensation will not form. When

using the LHX there is the opportunity to drive the enclosure of the camera and the CCD

chamber window significantly below ambient temperature if the recirculating water is colder

that the surrounding environment. If the relative humidity is high enough, this action could

drop the camera below the dew/frost point and condensation will form.

Caution: Do not allow excessive dew or frost to collect in or on the camera.

Exercise the normal precautions that you would with any precision optical or

electronic device. Never use the LHX to drive the camera temperature so low that

liquid water forms on or in the camera. Under certain conditions excessive

moisture can impair or damage the optical coatings and the internal electronics.

Controlling the Cooler

The operation of the cooler is managed from your CCD imaging application (MaxIm,

CCDSoft, etc.) When power is first applied to your camera the cooler is in an inactive state.

It must be actively turned on. The following explores the technical details of camera cooling

utilizing MaxIm as the imaging application. For step-by-step operating instructions and

changing the CCD setpoint temperature, see Section 4.

Below is a snapshot of the Setup tab in the Camera Control window, just after the Connect

and then Cooler On button was clicked. Notice that the current CCD temperature is 23ºC,

the default Setpoint is 0ºC, and that the cooler power is 100%

When the Cooler On button is clicked, the camera immediately starts cooling the CCD at full

power. The cooler will stay at full power until it has cooled the CCD to within a few degrees

of the setpoint temperature. The camera will then start adjusting the power applied to the

cooler as it approaches the setpoint temperature. The displayed CCD temperature may

slightly over-shoot the setpoint temperature as the regulation servo locks. It can take a

couple more minutes for the temperature servo to achieve a solid lock. After lock is

achieved, the camera will keep the CCD temperature within 0.1ºC of the setpoint.

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QSI 520c Betriebsanweisung Seite 19