Recent content by zartoop

Whilst you are generally correct there may be a slight mis-understanding where you say the fan may keep the heatsink 'too cold'. The heatsink should ideally maintain a constant temperature and that constant temp should be close to, if not at, the calibration temp. A fan will never cool the...

For a TEC based sensor a fan is arguably unnecessary at the powers (<3w) that are typically measured in hobbyist lasers. Sensors for measuring high power lasers do have cooling fans. There are a number of considerations that might make a fan a good idea. I left the fan in place as it came with...

Thanks Adrian:wave: PM sent.

Thanks Bluefan:thanks:! I appreciate your advice and great member/customer care. I had actually missed the point of the opamp being used to apply hardware conversion to correspond mV to mW. I will knock up a instrumentation preamp to interface the sensor with my DMM. I had intended applying the...

Sorry if I was not clear - I am not asking anyone else to do any work – I’ve done it all and will do the rest. As we are all learning and doing this hobby together I thought a member might provide access to either 1) A calibrated LPM to allow me calibrate mine against, or 2) Known power output...

Thanks for your suggestions guys - I really appreciate it. I done a lot of reading since posting and your comments and advice are really helping. Thanks for the links and tips - I'll get back once I've researched your links and advice. Thanks

??????

Semantics Jerry ... of course I am not calibrating the sensor ... I am calibrating the system. And don't knock TEC sensors even if it is tongue in cheek. The Laserbee uses a coated TEC sensor. Are you saying they're no good? Krylon paint is a low cost, very effective coating - plenty of research...

Thanks ... Yes I know thanks – that’s why I wrote “I have a TEC based LPM detector “ What I have pictured is the sensor. By measuring the output (and when calibrated) it will be a LPM. I don’t see why. The output in mV can be directly measured by multimeter to 0.1mV accuracy so no...

I have a TEC based LPM detector that I would like calibrated. I am in Adelaide Australia. Anyone local with a calibrated LPM that could help me out please? Any help much appreciated. Heatsink - CPU heatsink with fan - surplus from local computer shop - $0 TEC - Custom Thermoelectric TEC - pn...

I am after better lenses than the Aixiz. can you please provide the specs for the glass G2 lens you sell. EFL, NA etc please. Thanks.

so no optics experts here at all?

all aixiz lenses

I have made a 635nm - 670nm 250mw handheld laser for light plastic welding. Yes it does work! Used standard Aixiz module, DVD diode etc I have Aixiz acrylic and glass lenses, plus empty Aixiz lens holders. I am not happy with the collimation of the lenses that I have although I might be...