Recent content by AndreyG

Thank you, this is good insight. Modulating the input should help to eliminate-limit drift due to accumulation of stray charges. Similar to what other sensors do. Kelvin sensor is capacitor with oscillating plate, field mill uses shutter. My biggest concern now - will there be any electrical...

Thank you for the reply. However I can not put anything on the cable. I need to sense the voltage in it without interfering. I need to come up with sensing method. After two days of studying I concluded that I need to sense static electric field, discovered Kelvin sensors, field mills. Idea of...

Thank you for all the suggestions, serious and playful. "... you must be much more specific in your question. " More specific - ok. I need to detect presence of 400VDC in two-conductor cable with no load from ~25cm away. I do not need to measure the actual voltage only detect it. The detector...

Do you mean to move it mechanically? Interesting. This I can try using small linear motor. Do you know if anybody produces equipment like that? Thank you. Andrey

I am not lazy berkeman. I do know few things but do not consider myself an expert in electrostatic measurement techniques. That's why i posted question hoping somebody more experienced will share his/her opinion with me.

Dear berkeman I found your replies confusing sorry. I did not mean to be obnoxious or anything personal. I am new here, asked plain question, got pointless disrespectful sarcasm from you. It does not help. Have good day.

Dear Berkeman, you over-simplifying it. At least one more method I know myself - field mills. It should be something better though, more modern.

How to build Non-contact DC Voltage detector/sensor?

What is electric field distribution around two conductor cable connected to DC power supply? Assume power supply is isolated and not grounded. Assume cable is straight. Case 1: no current runs through the cable. One wire is positive, another – negative. Negative or zero? If we think in terms of...

How to specify a lens to increase angular responsivity of optical sensor? Sensor I presently use has angular responsivity +/-60 degrees at 50% level and I would like to increase it to +/- 80 degrees at 50% level or more. Which lens should I use? Please advice on design guidance for this...