What sensor can measure the droplet falling (through the infusion tube)

hjchjc

What sensor can measure the droplet falling (through the infusion tube) [Copy link]

 

I bought an infrared tube module on Taobao, but I found that it cannot penetrate the infusion tube to detect the droplets falling inside. It directly regards the outer wall of the infusion tube as an obstacle and cannot detect what is inside the infusion tube. How do the experts solve this problem?

maychang

I'm afraid it's not possible to use the infrared tube directly? You have to add an optical system, a set of lenses to focus the light emitted from the tube onto the droplet, and another set of lenses to convert the emitted light into parallel light.

maychang

In addition, the dripping part of the infusion tube is made of glass. This glass is transparent to visible light (otherwise you can't see the drop), but it may not be transparent to the infrared light emitted by the infrared tube you are using.

tagetage

The analog quantity needs to be converted into digital quantity for processing. Digital quantity cannot be obtained directly by infrared radiation.

annysky2012

Optics can

littleshrimp

It should be feasible to use infrared counter-radiation. The analog signal needs to be measured. The droplet obstruction should refract the light and affect the intensity of the optical signal detected by the receiver.

In addition to optics, you can also try capacitive sensor detection.

qwqwqw2088

Infrared tube, pay attention to the ambient light during infusion

Searching for the 2003 Electronics Competition, this is what I found.

Liquid dripping speed monitoring device F

book1

Just use ordinary light-emitting tubes and ordinary phototubes to cover up the ambient light and take the change value.

huo_hu

You can just replace the infrared transmitter with a laser pointer.

wangerxian

I feel that the current optical method is easier to achieve

chunyang

First determine the absorption rate of the tube wall to the light of the wavelength used, and determine the transmission power in combination with the receiving sensitivity. Also pay attention to the optical path design and related circuit design. The transmitting side generally needs to be modulated, and the receiving side generally needs to be amplified and demodulated.

516750565

The first thing that comes to mind is the radiation sensor, which uses X-ray penetration detection, the same principle as the smoke alarm. If you still don't understand, you can add me on QQ 516750565

wangzejie

https://www.bilibili.com/video/B ... id_from=333.999.0.0 You can try this one, it is not afraid of ambient light