Is there a sensor that can sense the layers?

zhanweiming

Is there a sensor that can sense the layers? [Copy link]

 

Is there a sensor that can sense through layers?

The sensing position is on the other side of shell A, and shell B needs to be sensed through shell A

littleshrimp

What does the interlayer sense?

maychang

What are A and B made of? Are they exactly the same material or different materials? What quantity is sensed by the interlayer? You have to explain it clearly, right?

dcexpert

Non-metallic and conductive materials can be sensed by capacitive sensing

zhanweiming

dcexpert posted on 2021-6-5 12:00 Non-metallic and conductive materials can be sensed by capacitive sensing

Capacitive sensing has no response to plastic shells.

zhanweiming

maychang posted on 2021-6-5 10:45 What materials are A and B made of? Are they exactly the same material or different materials? What quantity is sensed by the interlayer? You have to make it clear, right?

The material is ABS+PC

zhanweiming

zhanweiming posted on 2021-6-5 14:03 The material is ABS+PC

Detailed dimensions, see picture

zhanweiming

littleshrimp posted on 2021-6-5 10:28 What does the interlayer sense?

Is the sensed B shell at the specified position?

maychang

zhanweiming posted on 2021-6-5 15:03 The material is ABS+PC

ABS is an opaque plastic. Using ultrasound may work, but it is difficult at such a small distance.

chunyang

A is fixed and transparent. It can be installed at a certain angle with an infrared LED and a photosensitive tube. At the same time, a shading plate with small holes is added in front of the LED and the photosensitive tube to ensure that the light beam is thin enough. Carefully adjust the angle so that the reflection is strongest when the B plate is in the required position. At this time, an appropriate fixture can be made to fix the LED and the phototube. Even if the reflectivity of the B plate is not constant, as long as the peak value of the photosensitive tube is detected, it can be known whether the B plate is in the appropriate position. If a micro-power laser is used, the effect should be better. This method is affected by the flatness of the surface of the B plate. If there are obvious convexities and concavities, it may lead to misjudgment, but if the B plate has displacement in the plane direction at the same time, it may be corrected by software. The specific process details require careful study of the object and needs, and comprehensive consideration.

Gen_X

Both capacitive and inductive sensing are acceptable. Inductive sensing can also achieve linearity (measurement) in a small range. If the distance is far, the inductance frequency should not be too high.

Put it below 10KHZ.

Gen_X

The capacitive type has strict requirements on the surrounding environment and the frequency cannot be too high, otherwise it is easy to be interfered.

zhanweiming

Gen_X Published on 2021-6-6 08:18 Both capacitive and inductive sensing are acceptable. Inductive sensing can also achieve linearity (measurement) in a small range. If the distance is far, the inductance frequency should not be too high, and should be above 10KHZ...

Inductive? Can you recommend some information? I have tried capacitive sensing, but it doesn't work.

Gen_X

Buy a ready-made one, don’t waste your time, you can learn it slowly later!

damiaa

Infrared penetration or light penetration?

zhanweiming

Gen_X posted on 2021-6-10 07:36 Buy a ready-made one, don’t waste your time, you can learn it slowly in the future!

I also want to buy ready-made

zhanweiming

chunyang posted on 2021-6-5 22:14 A is fixed and transparent. Infrared LEDs can be used with photosensitive tubes to be installed at a certain angle. At the same time, a shading plate with small holes is added in front of the LED and photosensitive tube to ensure light...

The molds are ready. Both are not transparent and made of the same material.

Gen_X

Search on Taobao: high frequency eddy current "displacement sensor",

Those that cost a few hundred dollars are fine, but those that cost tens of thousands may not be good. There are many types.

Just don't scare you.

If you still can't find it, contact me at Q3940776

Gen_X

Several main factors: effective distance + linearity + accuracy

Gen_X

Are you sensing ABS through ABS? If so, then the thickness of the object being sensed should be larger, otherwise there is no solution to this problem.

In addition, the sensed surface can be coated with metal powder or plating for sensing. If there is no other solution, some graphite powder, magnetic paint and other materials can be infiltrated into the sensed surface to complete non-metallic displacement monitoring.