Author Topic: Help needed in identifying the sensor  (Read 3400 times)

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Offline deepak.midriTopic starter

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Help needed in identifying the sensor
« on: June 21, 2014, 05:17:42 am »
I am using ultrasonic milk analyzer machine & i nee to identify what is the sensor.
http://www.eonbg.com/ultrasonic-milk-analyzers/milkanalyzer-ekomilk-ultra.html#4-user-manual

I have attached pics of sensor. It gets broken.

Page 1 & Page 3 are the two sensor at two ends of tube.
Tube is shown in Page 2. Tube is broken.
 

Offline sfiber

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Re: Help needed in identifying the sensor
« Reply #1 on: June 21, 2014, 05:34:49 am »
Woow,I wonder too what it is.actually its not look like a sensor
 

Offline What_NZ

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Re: Help needed in identifying the sensor
« Reply #2 on: June 21, 2014, 06:09:29 am »
Looks like a Piezo sensor in the centre and it is being used to measure pressure, most likely?
« Last Edit: June 21, 2014, 07:02:11 am by What_NZ »
 

Offline What_NZ

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Re: Help needed in identifying the sensor
« Reply #3 on: June 21, 2014, 07:08:36 am »
I see that that the Product information mentions "Ultrasonic Technology" so one could be a Ultrasonic transmitter and the other a receiver?

The wire wrapped around the tube is a heating element?
 

Offline SeanB

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Re: Help needed in identifying the sensor
« Reply #4 on: June 21, 2014, 07:17:09 am »
I would take a guess that the coil is doing something to a magnetostrictive ferrite, and this is transmitted to the milk and used to get a resonant pulse that is dependant in things like temperature ( likely read by a thermistor) and then the piezo discs on the ends read the oscillation to get the amplitude and such, which will be a function of the density of the surrounding fluid. Thus with the density and temperature  you can calculate the amount of fat in the mix, thus giving butterfat and water content. Likely the piezo strips are used to do do a simple speed of flight to compensate the long rod, and the brass core is used to detect ionic concentration by the loss from eddy currents in the liquid.

But, without knowing the materials the ferrite is made from, you will not be able to copy the sensor, and will have to buy a new one. The materials are not likely to be off the shelf ones, and will probably be a proprietary blend especially made for the application.
 

Offline What_NZ

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Re: Help needed in identifying the sensor
« Reply #5 on: June 21, 2014, 07:27:46 am »
I would take a guess that the coil is doing something to a magnetostrictive ferrite, and this is transmitted to the milk and used to get a resonant pulse that is dependant in things like temperature ( likely read by a thermistor) and then the piezo discs on the ends read the oscillation to get the amplitude and such, which will be a function of the density of the surrounding fluid. Thus with the density and temperature  you can calculate the amount of fat in the mix, thus giving butterfat and water content. Likely the piezo strips are used to do do a simple speed of flight to compensate the long rod, and the brass core is used to detect ionic concentration by the loss from eddy currents in the liquid.

But, without knowing the materials the ferrite is made from, you will not be able to copy the sensor, and will have to buy a new one. The materials are not likely to be off the shelf ones, and will probably be a proprietary blend especially made for the application.

Yeah everything you said....... I feel very humble (i.e. I learnt something) Sounds like you are familiar with such sensors?
 

Offline deepak.midriTopic starter

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Re: Help needed in identifying the sensor
« Reply #6 on: June 21, 2014, 07:55:45 am »
I was reading :
http://www.dispersion.com/ultrasound-for-characterizing-liquid-based-food-products

It says:
Figure 1 illustrates the main principles of the "transmission" approach. Piezo-crystal transmitter generates ultrasound pulse of certain frequency and intensity and launches it into the sample. Intensity of pulse decays due to the interaction with the sample. Piezo-crystal received converts this weaker pulse back to electric pulse and sends it to electronics for comparison with the initial pulse. This means that intensity of the pulse after propagation through the sample is a raw data.

I was looking for sensor where I can buy.still searching..............
 

Offline SeanB

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Re: Help needed in identifying the sensor
« Reply #7 on: June 21, 2014, 08:19:57 am »
Yeah everything you said....... I feel very humble (i.e. I learnt something) Sounds like you are familiar with such sensors?

No, never met them apart, but have seen and used industrial sensors that used ultrasonics to detect levels in tanks and in clumping materials, either by measuring the volume above the tank with reflection or by looking from below to get the liquid/air interface. Plenty used a magnetostrictive generator as it is capable of very high power output and only needs low voltage drive. Piezoceramic is a very high impedance material, and needs very high voltage drive, but makes a very sensitive receiver instead.
 

Offline deepak.midriTopic starter

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Re: Help needed in identifying the sensor
« Reply #8 on: June 23, 2014, 10:07:51 am »
yes they are piezo sensor as explained in website:
http://www.dispersion.com/ultrasound-for-characterizing-liquid-based-food-products

I need to identify these sensor, anyone knows
 


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