Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possibility to create a coronavirus sensor using an optically excited
  electrical signal   The research of our team has led to a series of new experimental results,
revealing the so-called electromagnetic echo effect (EMEE). The EMEE signal is
highly sensitive even to small changes in the composition and properties of the
object under study - gas, liquid, or solid. The method is fast and contactless,
provides real-time analysis, and can be considered universal. We have an idea
to create a sensor to detect COVID-19 in three cases -- in the air, on hard
surfaces, and in fluids from the human body. The approach involves detecting
specific reactions to the virus, even if they are invisible without specialized
equipment. Our experience shows that the EMEE signal is very sensitive to weak
or practically imperceptible reactions. Therefore, we believe that it is quite
possible to register the presence of COVID-19. We have many experimental
results in this regard that support this idea. We have experience in creating
sensors to monitor the processes, composition, and properties of fluids
(including biological ones), as well as to detect pollution and contamination
in the atmosphere.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph