A multifunctional pointer-type charge detection device
By designing a multi-function pointer charge detection device, using electrostatic induction current and micro current amplifier, the problem of charge detection in the prior art is not intuitive and inability to judge the strength of the electric field, and the intuitiveness of charge detection and accurate judgment of the strength of the electric field are achieved.
Patent Information
- Application Number
- CN202420284497.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-02-01
AI Technical Summary
The existing positive and negative charge discriminator is not easy to understand by students in terms of working principle, the effect is not intuitive and eye-catching enough, and it cannot simultaneously display the existence or absence of the electric field and determine the strength of the electric field.
A multifunctional pointer charge detection device is designed. By testing the combination of metal balls, mica capacitors, micro current amplifiers and sensitive ammeters, the magnetoelectric DC microamperometer is driven by a high-power micro current amplifier using electrostatic induction current to judge the positive and negative charges and the strength of the electric field according to the pointer deflection direction and angle.
The convenience and intuitiveness of charge detection are realized, making it easier for students to understand the existence and strength of the positive and negative charges and the electric field, and has the application value of junior high school science electrical teaching.
Smart Images
Figure CN222704662U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of charge testing, in particular to a multifunctional pointer-type charge detection device. Background Art
[0002] A positive and negative charge discriminator is an instrument used to detect and distinguish whether an object has a positive charge or a negative charge. It is based on the principle of electric field induction and determines the charge type by measuring the electric field strength and polarity. When using the positive and negative charge discriminator, place the object to be detected in the sensing area of the instrument. The instrument will determine the charged state of the object by measuring the electric field strength and polarity. If the instrument displays a positive charge, it means that the object has a positive charge; if the instrument displays a negative charge, it means that the object has a negative charge.
[0003] At present, the common positive and negative charge discriminator uses light-emitting diodes to emit red and green lights of different colors to judge the positive and negative of the charge. The working principle of this instrument is not easy for students to understand, and the effect is not intuitive and eye-catching enough. As for the instrument that can also show whether the electric field exists and judge the strength of the electric field, it has not yet appeared.
[0004] To this end, the utility model provides a multifunctional pointer-type charge detection device. Utility Model Content
[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.
[0006] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a multifunctional pointer-type charge detection device, comprising a probing metal ball; the probing metal ball is connected to a mica capacitor through a wire; the input end of the mica capacitor is connected to the input end of a micro-current amplifier through a wire; the output end of the micro-current amplifier is connected to a sensitive ammeter through a wire; the probing metal ball is connected to the negative terminal of the input end of the micro-current amplifier through a wire; a distribution electric device is placed next to the probing metal ball; a distribution electric device is placed next to the probing metal ball.
[0007] The beneficial effects of the utility model are as follows:
[0008] 1. The utility model describes a multifunctional pointer-type charge detection device, which drives a magnetoelectric DC microammeter to deflect by passing the current formed by static electricity through a high-power microcurrent amplifier, determines the positive or negative of the test charge according to the deflection direction of the pointer of the DC microammeter, and determines the strength of the electric field according to the deflection angle of the pointer of the DC microammeter, thereby making the detection of charge more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The utility model will be further described below in conjunction with the accompanying drawings.
[0010] Figure 1 It is a principle diagram of the charge detection device in the utility model.
[0011] In the figure: 1. Probe metal ball; 101. Cloth electrical appliance; 2. Mica capacitor; 3. Micro current amplifier; 4. Sensitive ammeter. DETAILED DESCRIPTION
[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0013] Specific examples are given below.
[0014] like Figure 1As shown, a multifunctional pointer-type charge detection device described in an embodiment of the utility model includes a probe metal ball 1; the probe metal ball 1 is connected to a mica capacitor 2 through a wire; the input end of the mica capacitor 2 is connected to the input end of a micro-current amplifier 3 through a wire; the output end of the micro-current amplifier 3 is connected to a sensitive ammeter 4 through a wire; the probe metal ball 1 is connected to the negative terminal of the input end of the micro-current amplifier 3 through a wire; a cloth electric appliance 101 is placed next to the probe metal ball 1; when working, the mica capacitor 2 is connected to both ends of the input end of the micro-current amplifier 3, the negative terminal "-" at the input end of the micro-current amplifier 3 is connected to the probe metal ball 1 with a wire, and the output end of the mica capacitor 2 is connected to the sensitive ammeter 4. When charged When a body approaches and contacts the probing metal ball 1 or an external electric field suddenly acts on the probing metal ball 1, the static electricity on the probing metal ball 1 causes the mica capacitor 2 to generate an induced current. After the induced current is amplified by the micro-current amplifier 3, the sensitive ammeter 4 can produce a very obvious deflection. From the direction of the deflection of the sensitive ammeter 4, the positive and negative polarity of the charge carried by the charged body or the field source can be determined. This device can use the electrostatic induced current to identify the positive and negative polarity of the charge carried by the object. The specific method is that the probing metal ball 1 must be upright. To prevent leakage, the wire connected to the probing metal ball 1 cannot touch the desktop or other objects. Turn on the switch of this device, use the zeroing function of the micro-current amplifier 3 to make the pointer of the probing metal ball 1 point to the center of the dial, and use the positively charged ones rubbed by silk to measure the positive and negative polarities of the charge carried by the charged body. The organic glass rod and the negatively charged rubber rod rubbed by fur are close to but cannot touch the test metal ball 1, and it can be observed that the pointer of the sensitive ammeter 4 deflects to the right and left respectively. The above method can also be used to judge the types of charges carried by the following charged bodies, such as straws rubbed by napkins, glass rods rubbed by wool and silk respectively, and metal balls rubbed by foam plastics (the charge carried by metals can also be detected when conditions are good). It can also detect whether the electric field exists, preliminarily compare the strength of the electric field, and determine the polarity of the electric field source charge. The specific method is to use Fan's insulator to charge the cloth electric appliance 101 as the field source charge, cover the cloth electric appliance 101 with a grounded metal mesh cover, and then place the test metal ball 1 near the field source charge. Due to the shielding effect of the metal mesh cover At this time, there is no electric field at the location of the test metal ball 1, and the pointer does not change; lift the metal mesh cover, the shielding is cancelled, and it can be observed that the pointer of the sensitive ammeter 4 has a large deflection, indicating that there is an electric field at the test metal ball 1. Then assemble two identical sets of this device, and erect the two test metal balls 1 at different positions several centimeters apart near the electrical appliance 101. Lift the metal mesh cover, and it can be seen that the pointers of the two sensitive ammeters 4 swing at different angles. The closer to the field source charge, the larger the swing angle of the pointer of the sensitive ammeter 4, indicating that the electric field strength at this location is greater. According to the deflection direction of the pointer of the sensitive ammeter 4, the polarity of the electric field source charge can be determined. This device can be used as an electrical science teaching instrument for elementary and junior high schools, and can be used as an electrical physics teaching instrument for junior and senior high schools.
[0015] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A multifunctional pointer-type charge detection device, characterized in that: The invention comprises a probing metal ball (1); the probing metal ball (1) is connected to a mica capacitor (2) via a wire; the input end of the mica capacitor (2) is connected to the input end of a micro-current amplifier (3) via a wire; the output end of the micro-current amplifier (3) is connected to a sensitive ammeter (4) via a wire; the probing metal ball (1) is connected to the negative terminal of the input end of the micro-current amplifier (3) via a wire; and a distribution device (101) is placed next to the probing metal ball (1).