CN115790875A - Temperature detection method, readable storage medium and device - Google Patents
Temperature detection method, readable storage medium and device Download PDFInfo
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- CN115790875A CN115790875A CN202211186087.7A CN202211186087A CN115790875A CN 115790875 A CN115790875 A CN 115790875A CN 202211186087 A CN202211186087 A CN 202211186087A CN 115790875 A CN115790875 A CN 115790875A
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Abstract
The invention discloses a temperature detection method, a readable storage medium and a device, wherein the method comprises the following steps: detecting a voltage-current phase difference between a current flowing through the scanner and a driving voltage of the scanner during operation of the scanner; and determining the current environment temperature according to the voltage-current phase difference and the corresponding relation between the voltage-current phase difference and the environment temperature of the scanner. This scheme is under the condition of not additionally increasing any external sensor, just has realized ambient temperature's detection only through detecting drive current, compares external temperature sensor, owing to adopt self characteristic measurement temperature, does not have the heat transfer process, and temperature testing result real-time is higher, and does not have the measuring error that temperature sensor mounted position error brought. Furthermore, no external sensor is required to be additionally arranged, and the device also has the technical effects of simple structure, low cost, small volume, light weight and the like.
Description
Technical Field
The invention relates to the field of projection display, in particular to a temperature detection method, a readable storage medium and a device.
Background
The imaging principle of the fiber scanning display technology (FSD) is that an optical fiber is driven by an optical fiber scanner to perform a predetermined two-dimensional scanning track, a light source is modulated to output light corresponding to each pixel point of an image to be displayed, and then the light corresponding to each pixel point of the image to be displayed is projected onto a projection plane one by one through the optical fiber to form a projection picture.
The optical fiber scanner actuator part is mainly composed of piezoelectric ceramics, the piezoelectric ceramics are very sensitive to external conditions such as temperature, the polarization strength of the piezoelectric ceramics can change along with the change of factors such as temperature, and for the scanner composed of the piezoelectric ceramics, temperature compensation needs to be carried out on the scanner to realize stable display images.
In the prior art, when the temperature compensation is performed on the scanner, an additional temperature sensor is required to detect the ambient temperature of the scanner.
The additional sensor for detecting the temperature will increase the size, power consumption and cost of the scanner module, and increase the complexity of production and assembly.
Disclosure of Invention
The invention aims to provide a temperature detection method, a readable storage medium and a device, which are used for solving the technical problems that when a scanner is subjected to temperature compensation, a temperature sensor is additionally arranged to detect the ambient temperature of the scanner, the size, the power consumption and the cost of a scanner module are inevitably increased, and the production and assembly complexity is inevitably increased in the prior art.
In order to achieve the above object, a first aspect of an embodiment of the present invention provides a temperature detection method, including:
detecting a voltage-current phase difference between a current flowing through the scanner and a driving voltage of the scanner during operation of the scanner;
and determining the current environment temperature according to the voltage-current phase difference and the corresponding relation between the voltage-current phase difference and the environment temperature of the scanner.
Optionally, the method for obtaining a corresponding relationship between the voltage-current phase difference and an ambient temperature of the scanner includes:
measuring impedance curves of the scanner at different ambient temperatures;
and obtaining the corresponding relation between the environment temperature and the voltage-current phase difference under the fixed driving frequency based on the impedance curve.
Optionally, the scanner is a piezoelectric ceramic scanner, and measuring impedance curves of the scanner at different environmental temperatures includes:
and measuring impedance curves of the piezoelectric ceramic scanner at different environmental temperatures by using a piezoelectric ceramic impedance analyzer.
Optionally, the method further includes:
and correcting the driving signal of the scanner according to the corresponding relation between the driving signal of the scanner and the environment temperature.
Optionally, the method for obtaining the corresponding relationship between the driving signal and the environmental temperature includes:
under different environmental temperatures, adjusting the amplitude and the phase of the driving signal of the scanner to enable a scanned image to meet preset conditions, thereby obtaining the corresponding relation between the driving signal and the environmental temperature; the corresponding relation between the driving signal and the environment temperature comprises the corresponding relation between the driving voltage and the environment temperature, and the corresponding relation between the driving phase and the environment temperature.
Optionally, the preset conditions met by the scanned image include one or more of maintaining the image amplitude at the target amplitude value and keeping the image parity line content overlapped.
A second aspect of the embodiments of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is used to implement the steps of the method of the first aspect when executed by a processor.
A third aspect of embodiments of the present invention provides a scanning device, including:
a scanner;
a current detection circuit and a drive voltage detection circuit connected to the scanner;
the phase discriminator is respectively connected with the current detection circuit and the driving voltage detection circuit and is used for outputting a voltage-current phase difference between the current passing through the scanner and the driving voltage of the scanner;
and the processor is connected with the phase discriminator and is used for determining the current environment temperature according to the voltage and current phase difference and the corresponding relation between the voltage and current phase difference and the environment temperature of the scanner.
Optionally, the processor is further configured to correct the driving signal of the scanner according to a corresponding relationship between the driving signal of the scanner and the ambient temperature;
the device also comprises a scanner driving circuit which is respectively connected with the processor and the scanner, and the scanner driving circuit is used for driving the scanner to vibrate according to the corrected driving signal.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
during the working process of the scanner, the current environment temperature is determined by detecting the phase difference between the current flowing through the scanner and the driving voltage applied to the scanner and then according to the voltage-current phase difference and the corresponding relation between the voltage-current phase difference and the environment temperature of the scanner. According to the scheme in the embodiment of the invention, under the condition of not additionally adding any external sensor, the detection of the ambient temperature is realized only by detecting the driving current, and the information of temperature change can be obtained by detecting the phase difference between the driving current and the driving voltage.
Furthermore, because no external sensor is additionally arranged, the wearable glasses are simple in structure, low in cost, small in size and light in weight, and are suitable for wearable equipment of AR (Augmented Reality) glasses, which has strict requirements on size and weight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
FIG. 1 is a flow chart of a temperature detection method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a scanner impedance curve according to an embodiment of the present invention;
fig. 3 is a block diagram of a scanning apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 1, fig. 1 is a schematic flow chart of a temperature detection method according to an embodiment of the present invention, and the method includes the following steps.
And 102, determining the current environment temperature according to the voltage and current phase difference and the corresponding relation between the voltage and current phase difference and the environment temperature of the scanner.
According to the scheme in the embodiment of the invention, under the condition of not additionally adding any external sensor, the detection of the ambient temperature is realized only by detecting the driving current, and the information of temperature change can be obtained by detecting the phase difference between the driving current and the driving voltage.
Next, the principle of the scheme in the embodiment of the present invention will be explained.
The scanner actuator part is mainly composed of piezoelectric ceramics, and the scanner converts an electric signal into vibration by utilizing the inverse piezoelectric effect of the piezoelectric ceramics, and drives the optical fiber to vibrate to scan images. The polarization intensity of the piezoelectric ceramic changes with the change of factors such as temperature, and the like, so that the scanned image track changes. Meanwhile, the impedance curve of the piezoelectric ceramic may also drift with temperature changes. As shown in fig. 2, fig. 2 is an impedance curve of a certain electrode of a scanner (in this specification, the drawing is represented by different colors for convenience of distinction), which is measured by a piezoelectric ceramic impedance analyzer, and when the impedance curve of the scanner drifts, the phase shift value changes when the driving frequency is unchanged, that is, the phase difference between the phase of the current flowing through the scanner and the driving voltage waveform changes. Therefore, information on the temperature change can be obtained by detecting the phase difference between the drive current and the drive voltage.
Then, by measuring the impedance curves of the scanner at different temperatures, the correspondence between the driving voltage current phase difference p and the temperature T at a fixed driving frequency can be obtained, and the correspondence is expressed by the expression T = f (p).
In the embodiment of the invention, the system where the scanner is located can be controlled by combining the temperature change information. Next, the drive signal feedback control of the scanner will be described as an example.
As can be seen from fig. 2, the impedance curve and the phase curve of the piezoelectric ceramic both shift with the temperature. When the driving frequency is not changed, the amplitude and the phase of the response are changed. At different temperatures, the amplitude and phase of the drive signal of the scanner are adjusted to maintain the image amplitude unchanged, the odd-even line contents are kept coincident, and the drive voltage V can be obtained x Driving phase P x The curves were fitted to the curves for temperature T, respectively, to obtain the following two functions.
V x ＝F v (T)
P x ＝F p (T)
Then, the drive voltage and the drive phase are corrected according to the following two functions obtained by fitting.
Therefore, in the embodiment of the invention, the ambient temperature signal can be detected according to the corresponding relation between the voltage and current phase difference and the ambient temperature, so that the temperature compensation is carried out on the scanner control circuit, and the driving voltage and the driving phase are corrected in real time.
In another possible embodiment, since the above description has calibrated the relationship between temperature and voltage-current phase difference by measurement, the expression T = f (p) is substituted into the above function V x And P x A new driving voltage V can be obtained x And a driving phase P x The expression for the function of the voltage-current phase difference is as follows.
V x ＝F v (p)
P x ＝F p (p)
Therefore, in the embodiment of the invention, the temperature compensation can be carried out on the scanner control circuit according to the voltage and current phase difference serving as the temperature sensing signal, and the driving voltage and the driving phase can be corrected in real time.
In the embodiment of the present invention, the correction axis driving signal can be corrected in the same manner, and will not be described in detail herein.
Based on the same inventive concept, an embodiment of the present invention further provides a scanning apparatus, as shown in fig. 3, and fig. 3 is a block diagram of the scanning apparatus provided in the embodiment of the present invention. The scanning apparatus includes a scanner 301; a current detection circuit 302 and a drive voltage detection circuit 303 connected to the scanner; a phase detector 304 connected to the current detection circuit 302 and the driving voltage detection circuit 303, respectively, for outputting a voltage-current phase difference between a current flowing through the scanner and a driving voltage of the scanner; a processor 305 connected to the phase detector 304, the processor being configured to determine a current ambient temperature according to the voltage-current phase difference and a corresponding relationship between the voltage-current phase difference and an ambient temperature of the scanner.
In this embodiment of the present invention, the processor 305 is further configured to modify the driving signal of the scanner according to a corresponding relationship between the driving signal of the scanner and the ambient temperature; the apparatus further comprises a scanner driving circuit 306, which is respectively connected to the processor 305 and the scanner 301, wherein the scanner driving circuit 306 is configured to drive the scanner to vibrate according to the modified driving signal.
With regard to the scanning device in the above-described embodiment, the specific manner in which each part performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated upon here.
In another exemplary embodiment, a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the above-described temperature detection method is also provided. For example, the computer readable storage medium may be the memory described above including program instructions that are executable by the processor to perform the temperature detection method described above.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A method of detecting temperature, comprising:
detecting a voltage-current phase difference between a current flowing through the scanner and a driving voltage of the scanner during operation of the scanner;
and determining the current environment temperature according to the voltage-current phase difference and the corresponding relation between the voltage-current phase difference and the environment temperature of the scanner.
2. The method of claim 1, wherein obtaining a correspondence between the voltage-current phase difference and an ambient temperature in which the scanner is located comprises:
measuring impedance curves of the scanner at different ambient temperatures;
and obtaining the corresponding relation between the environment temperature and the voltage-current phase difference under the fixed driving frequency based on the impedance curve.
3. The method of claim 2, wherein the scanner is a piezo ceramic scanner and measuring impedance curves of the scanner at different ambient temperatures comprises:
and measuring impedance curves of the piezoelectric ceramic scanner at different environmental temperatures by using a piezoelectric ceramic impedance analyzer.
4. The method of claim 1, wherein the method further comprises:
and correcting the driving signal of the scanner according to the corresponding relation between the driving signal of the scanner and the ambient temperature.
5. The method of claim 4, wherein obtaining the correspondence between the scanner drive signal and the ambient temperature comprises:
under different environmental temperatures, adjusting the amplitude and the phase of the driving signal of the scanner to enable a scanned image to meet preset conditions, thereby obtaining the corresponding relation between the driving signal and the environmental temperature; the corresponding relation between the driving signal and the environment temperature comprises the corresponding relation between the driving voltage and the environment temperature, and the corresponding relation between the driving phase and the environment temperature.
6. The method of claim 5, wherein the preset conditions satisfied by the scanned image include one or more of maintaining the image amplitude constant at the target amplitude value, and keeping the image parity line content coincident.
7. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
8. A scanning device, comprising:
a scanner;
a current detection circuit and a drive voltage detection circuit connected to the scanner;
the phase discriminator is respectively connected with the current detection circuit and the driving voltage detection circuit and is used for outputting a voltage-current phase difference between the current passing through the scanner and the driving voltage of the scanner;
and the processor is connected with the phase discriminator and is used for determining the current environment temperature according to the voltage and current phase difference and the corresponding relation between the voltage and current phase difference and the environment temperature of the scanner.
9. The apparatus of claim 8, wherein the processor is further configured to modify the drive signal of the scanner according to a correspondence between the drive signal of the scanner and the ambient temperature;
the device also comprises a scanner driving circuit which is respectively connected with the processor and the scanner, and the scanner driving circuit is used for driving the scanner to vibrate according to the corrected driving signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211186087.7A CN115790875A (en) | 2022-09-27 | 2022-09-27 | Temperature detection method, readable storage medium and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211186087.7A CN115790875A (en) | 2022-09-27 | 2022-09-27 | Temperature detection method, readable storage medium and device |
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| Publication Number | Publication Date |
|---|---|
| CN115790875A true CN115790875A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211186087.7A Pending CN115790875A (en) | 2022-09-27 | 2022-09-27 | Temperature detection method, readable storage medium and device |
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| CN (1) | CN115790875A (en) |
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- 2022-09-27 CN CN202211186087.7A patent/CN115790875A/en active Pending
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