[China Instrument Network Instrument Development] Accurate measurement of electric field strength is critical for many applications, but existing sensor architecture systems are too complex and difficult to calibrate. TU Wien, University of Technology, Austria, has developed a new type of field strength detector based on microelectromechanical technology that improves field strength measurement methods. This work has been published in Nature Electronics.
Picture from TU Wien
Andreas Kainz of TU Wien said: "The current equipment for measuring electric field strength has some significant drawbacks. For example, the conductive metal components contained in these devices will affect the electric field measurement. If the device is grounded to provide a reference point for measurement, then The effect will be more pronounced." The researchers used different methods to redesign the passive MEMS components and to use electrostatic induction to affect the small silicon grid structure, which is only a few microns in size, attached to a small spring. When the silicon block is exposed to an electric field, applying a force on the silicon crystal, the spring will be slightly compressed or extended.
Mass production
This mechanical displacement can then be optically tracked by observing changes in the LED beam that pass through the structure. Another grid is fixed above the silicon block, so when the silicon moves under the influence of the electric field, a new light flux will be generated. This change can be used to measure the strength of the electric field that caused the displacement.
In a published paper, the research team noticed that the new equipment could also be used in relatively low frequency areas. Kainz said: "The device has been able to accurately measure a weak electric field of less than 200 volts per meter. This means that our system can already run at roughly the same level as existing products, but our products are smaller and It's easier to use.â€
Meteorology is another target area for the device. Before lightning strikes or during thunderstorms, sensors will help resolve some of the unresolved issues in lightning studies of local electric fields, because lightning may cause mobile devices to issue lightning strikes. In addition, similar devices can also be used to display the distance of high-voltage transmission lines.
MEMS technology should allow the use of relatively low-cost silicon micromachining technology and mass production methods for mass production. This technology can also be used in applications such as cross-environmental monitoring and personal security. Kainz thinks: "The other measurement methods are mature enough, and our method is just beginning. I firmly believe that our MEMS sensor will realize more applications in the future."
(Original title: Austrian researchers use new sensors to accurately measure electric field strength)
Humic Acid
Humic acid is a large molecular organic substance widely used in nature. It is widely used in various fields, such as agriculture, forestry, animal husbandry, petroleum, chemical, building materials, medicine and health, environmental protection and so on. Especially now, we advocate the construction of ecological agriculture, pollution-free agricultural production, green food, pollution-free and environmental protection, which make humic acid highly respected. Facts have proved that human life and survival can not be separated from humic acid.
|
Humic Acid
|
|
Type
|
Granular
|
Powder1
|
Powder2
|
|
Organic Matter (Dry Basis)
|
90% min.
|
90% min.
|
90% min.
|
|
Humic Acid (Dry Basis)
|
70% min.
|
75% min
|
70% min.
|
|
Moisture
|
15% max
|
15% max
|
20% max
|
|
Ash
|
---
|
10% max
|
10% max
|
|
Residue on Sieve (0.5 MM)
|
---
|
5% max
|
5% max
|
|
Size
|
2--5 MM
|
---
|
---
|
|
Size Rate
|
90% min
|
---
|
---
|
|
Specific Gravity (G/CM3)
|
0.65
|
0.75
|
0.75
|
|
Ignition Point
|
540
|
520
|
520
|
|
Packing
|
25 KG Kraft paper bag
|
|
Usage
|
Used as Humic Acid fertilizer, soil ameliorator, plant growth stimulation, fertilizer efficiency promoter.
|
|
Storage
|
Keep in sealed and damp proof place
|
The effect of humic acid is remarkable, which is good for producing green healthy food, reducing environmental pollution and reducing the cost of farmers' production. Cannot be applied on the same farmland for a long time.
Water soluble humic acid can enhance the absorption of nitrogen and potassium, promote the decomposition of phosphorus, cultivate soil fertility and promote the development of crop roots.
Humic Acid powder,Water Soluble Fulvic Acid,Organic Fertilizer Humic Acid,humic acid granular
Hebei Woldi Trading Co.,LTD , https://www.woldiexport.com
