Patent Grant
9671443
This application claims the benefit of provisional application, No. 61/700,448 filed Sep. 13, 2012.
Field of Invention
The inventive subject matter relates to a device and method of measuring electrical charge on flying insects.
Background Art
Insecticides are typically applied to flying insects by spraying the insecticide with random coating or application based on chance collision with the spray.
Some pest traps comprise chemical lures, which attract the insect and are trapped by electrostatically charged particles (U.S. Pat. No. 6,041,543 to Howse) or are coated with electrostatically charged powder (U.S. Pat. No. 6,327,810 and U.S. Pat. No. 6,221,375 to P. E. Howse). However, no method of applying insecticides to flying insects by electrostatic charge currently exists. Furthermore, no efficient method to accurately measure static charge produced by flying insects is available. Devices and methods to obtain these measurements is of importance in designing methods to apply insecticides to flying insects using static charge with the minimum amount of pesticide, thus minimizing environmental impact.
The current invention relates to a device and method of measuring the electrical polarity and amount of electrical charge of flying insects. The electrical charge is principally due to the static charge developed as a result of their movement through the air and the movement of their wings.
The information derived from the method is applicable to the design of insecticidal materials and methods of application by electrical attraction.
Current methods of applying insecticides to flying insects typically involves spraying the material in the vicinity of the insects with the assumption that insects will be coated by randomly colliding with material momentarily suspended in the air as it slowly settles.
Insects create a charge as a result of the insect moving through the air and by the rapid motion of its wings. Application of materials by electrical charge attraction enables optimal efficacy of the materials. Furthermore, since the material effectiveness is optimized, the effect to the environment is minimized.
In order to design materials and optimal methods for application on flying insects, methods to determine the polarity and charge quantity are needed. An object of this invention is a device for measuring charge in flying insects.
The device, which is illustrated in
At one end of the tube is an opening (3). The fan (5) provides a positive pressure into the device via the opening (3) and encourages insects down the tube (1), which are inserted, in a preferred embodiment, through a tube (7). The tube (7) can be angle to provide more efficient entry of a single insect.
As insects proceed down the non-conductive hollow tube (1) they will enter a metal center section (9), where any charge on the insect will induce an electrical field. The induced electrical field is then measured by the center measurement terminal (13). In this embodiment, introduction of insects through the metal center section (9) are controlled so that measurement of induced electrical fields via the center measurement terminal (13) is associated with a single flying insect.
As the insects proceed down the non-conductive hollow tube (1) toward the fan (5), they encounter the second measurement point, a screen (11), located adjacent to the fan (5), as illustrated in
An electrometer is connected via the center measurement terminal (13) and the terminal connected to the screen (15) to measure charge quantity. In a preferred embodiment, charge associated the static charge accumulated by a flying insect is capable of being measured to at least the femtocoulombs level. In this embodiment, the terminal connectors for the electrometer can be any number of different types of connectors for co-axial connection, preferably with quick-release features such as Bayonett Neill-Concelman (BNC) type connectors. In a preferred embodiment, connectors that are capable of are able to attenuate inherent electrical noise are used, such as Triax™ terminals. These connectors would be used on either or both the center measurement terminal (13) and screen terminal (15).
The fan (5) is preferably powered by a direct current (DC) power source. The fan speed, by adjustment of the power source to control for the flow of air through the tube (1). In a preferred embodiment, the fan is capable of running only in a single direction, to ensure that air is provided through tube opening (3).
Measurement of charge induced via by the flight of a flying insect is of importance in designing insecticides materials and methods of their use to optimally apply the insecticide materials to the insects in flight.
In a preferred embodiment, the inventive method measures the induction of an electrical field by a single insect. Measurement can be conducted in a number of ways. As an illustration, measurement can be obtained as a single insect flies past metal plates or through a metal tube. In a preferred method, the device of Example 1 is utilized, wherein an insect flies through a metal tube and the induced electrical field is detected and measured by an electrometer.
In a preferred method, a second measurement of the total charge induced per insect is taken upon impact of a number of flying insects onto a metal screen. In this measurement, an average charge is measurement over the impacts of multiple insects. In a preferred embodiment, an adhesive is applied to the screen to ensure that the only a single impact per insect is measured. Any adhesive can be used as long as it solidly adheres the flying insect, preventing it from landing more than once.
In one embodiment and study, measurements of static charge were made following the insertion of flies (Musca domestica) into a device designed as in
The conditions during the study consisted of a relative humidity of 30% and a temperature of 73° F. Flies were attracted toward the screen by fly bait and water. Flies were preconditioned by removing food and water for 4 hours prior to being released into the tube/tunnel. In the study, the results of which are shown in Table 1, 60 measurements were taken, using a total of 104 flies. The flies were removed in between each test and the screen was grounded to zero.
The study, using the example device, resulted in all the measurements giving a positive charge for each insect. The average for all flies was +19.0 pC, with a standard deviation of 5.5. The highest per fly charge for one measurement was +29.4 pC for test #15 (4 flies). The lowest per fly charge was +5 pC in test #18 (1 fly).
1picoCoulombs
Having described the invention, one of skill in the art will appreciate in the appended claims that many modifications and variations of the present invention are possible in light of the above teachings. It is therefore, to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
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