Why can't this module penetrate the glass?

sky999

Why can't this module penetrate the glass? [Copy link]

 

Why is this module completely ineffective when blocked by glass? Is there a solution?

maychang

[Why is this module completely ineffective once it is blocked by glass? ]

[This module] You have to make it clear what kind of module it is, right? Infrared? Visible light? Ultraviolet? Far infrared?

maychang

[Why is this module completely ineffective once it is blocked by glass? ]

There are various kinds of glass. What kind of glass do you use to block the module?

sky999

maychang posted on 2023-2-13 15:57 [Why is this module completely ineffective once it is blocked by glass? ] [This module] should always be clearly stated as what kind of module it is? Infrared? Visible light? ...

I found it on Taobao, this is the picture, infrared, ordinary glass

qwqwqw2088

Infrared can penetrate ordinary glass without any problem

tagetage

Since the infrared rays emitted by the human body are very weak, the pyroelectric infrared sensor needs to add a Fresnel lens to achieve more accurate human movement detection. When encountering obstacles such as glass and curtains, the infrared rays emitted by the human body will attenuate and cannot penetrate the glass, which will also affect the recognition range of the sensor, so it is necessary to avoid being blocked by glass during installation.

chunyang

The first thing to say is that if you want to get timely and effective help, you must first describe the problem correctly and completely. Obviously, the original poster's question is neither correct nor complete, so it is normal that the netizen above cannot give a direct answer.

chunyang

Looking at the photos in the original post, the bottom one is an infrared pyroelectric sensor, the two on the right are infrared pyroelectric modules with Fresnel lenses, and the two on the left cannot be accurately guessed.

For the time being, we can only guess that the question the OP is asking is about infrared pyroelectric modules.

Whether the infrared pyroelectric module will be affected by glass shielding will affect the normal operation of the module, which is related to the material and thickness of the glass, the installation angle of the module and the glass, and the distance between the object to be detected and the glass and the module. Note that light will be reflected and refracted and there will be medium attenuation. The original poster did not provide enough information, so I can only say "I don't know".

sky999

chunyang posted on 2023-2-13 18:15 Looking at the photos in the original post, the one at the bottom is an infrared pyroelectric sensor, the two on the right are infrared pyroelectric modules with Fresnel lenses, and the two on the left cannot be accurately measured...

Are there so many differences? I don't know. I bought them all and tested them on a shelf with glass. I tried 4 of them and they were all the same. They were ineffective when blocked by the glass.

吾妻思萌

Infrared passes through glass. You have to see if the loss glass has ircf. This sensor usually does not come with a cover glass, otherwise you may need to adjust the gain~

wangerxian

Isn't this infrared heat release? Is it possible that glass can block heat energy? Put your hand on the glass for a while and see if it can be detected.

sky999

Azuma Simeng posted on 2023-2-14 11:07 To see if the infrared passes through the glass, you have to see if the loss glass has ircf. This type of sensor usually does not come with a cover glass, otherwise you may need to adjust the gain~

How to adjust the gain? What is IRCF? Just put your hand on the glass.

sky999

wangerxian posted on 2023-2-14 18:54 Isn't this infrared heat release? Is it possible that glass can block heat energy? Put your hand on the glass for a while and see if it can be detected. .

The glass can sense when you put your hand on it.

吾妻思萌

Azuma Si Meng posted on 2023-2-14 11:07 Infrared passes through glass. You have to see if the loss glass has ircf. This type of sensor generally does not come with a cover glass, otherwise you may need to adjust the gain~

How to adjust the gain? What is IRCF? Just put your hand on the glass

It is recommended to contact the original FAE to find out

wangerxian

sky999 posted on 2023-2-14 20:39 You can sense when you put your hand on the glass

I guess the glass can block the heat, and this module is not for visible light detection.