Human presence detection

Hello all,

I am looking at an application where I need to monitor human presence. I want to make sure the person is sitting at the workstation but I cannot use the seat to mount a sensor.

I want to make sure it is very accurate as it is monitoring for EHS data. I don't want any false reading from the chair or any other object moving past.

Ideally it would detect a person as soon as they sit down at the workstation and switch off as soon as they get up.

I have looked at various ultra sonic and temperature monitoring infrared sensors but all seem to be low voltage PCB type. I am looking for 24vdc analog or digital sensors to feed back to a PLC. The must be robust.

I also want to monitor the operators movements. For example, if they happen to be working on a certain side of the workstation (withing a 200mm range approx) then I would like to receive feedback to this effect.

Has anyone seen or used anything that might match my application?

Thank you.

Do the people have badges? If so, maybe RFID could be an option?

have you seen those devices used on parking lots to find out if a space for a car is available ?

Would pressure sensitive safety mats work???

mendonsy said:

Would pressure sensitive safety mats work???

Click to expand...

That's my thought also. Safety mats could be used in different "zones". I'm guessing that you can get mats with different pressure trigger levels correct? You'd need to have the mat not havea false positive if just the empty chair is on the mat.

What about area laser scanners? I believe you can teach multiple zones, but you may only get “zone breach” rather than “zone 1 breach”. AB and Keyence have some. SICK may too. I know Keyence makes some small ones.

I would be so tempted to go light-duty and high-tech, and use TensorFlow, even on a small embedded Linux computer like a Raspberry Pi.

How about 3-D sensor or camera
https://www.ifm.com/us/en/category/020/020_030

I'll second swimmy67's suggestion for a camera.

https://www.axis.com/partners/adp-partner-program/partner-application-selector

Enter your country on that page and find all kinds of custom firmwares for these cameras. One of those Axis partners probably has what you want. The advantage of a camera is that you could potentially monitor multiple locations with one camera.

Shawn

Thermal sensor
https://www.digikey.com/en/product-highlight/o/omron/d6t-thermal-sensor

https://www.google.com/url?sa=t&sou...FjAVegQIAhAB&usg=AOvVaw02XihmrnMOyMBsPYarD6PQ

We use Trust for this application in our office.

swimmy67 said:

How about 3-D sensor or camera
https://www.ifm.com/us/en/category/020/020_030

Click to expand...

Would have to program the logic to watch for a constantly changing value over a reasonably long time for a human. relativly easy to program them.

IFM camera Zones vs data registers


Zone 1 = Data 112
Zone 2 = Data 114
Zone 3 = Data 116
Zone 4 = Data 118
Zone 5 = Data 120

Here’s one more possible human sensor. I haven’t used them, but I hear they can be tuned very well to only detect humanoids. A few local companies have put these in aisles to detect people and wireless lights on forklifts to alert the forklift operator of a person around a blind corner.
https://smartaccess.bircher.com/en_us/detectors-and-switches-from-bbc-bircher-smart-access-delivered-worldwide/hercules-2s-microwave-motion-detector-from-bbc-bircher-smart-access/