CN111010216B - Signal management method for passive equipment - Google Patents
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- CN111010216B CN111010216B CN201911197910.2A CN201911197910A CN111010216B CN 111010216 B CN111010216 B CN 111010216B CN 201911197910 A CN201911197910 A CN 201911197910A CN 111010216 B CN111010216 B CN 111010216B
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- H04B5/79—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
Abstract
The embodiment of the invention relates to a passive equipment signal management method, which comprises the following steps: receiving a first electromagnetic wave signal from an upper computer through an antenna according to a preset first frequency; the energy storage conversion module performs electromagnetic conversion on the first electromagnetic wave signal to output power; charging the energy storage device; when the electric energy of the energy storage equipment is greater than or equal to the preset energy storage upper limit, the charging and discharging micro-processing module is electrified and reset; setting an energy storage conversion module to be in a signal processing state; continuously receiving a second electromagnetic wave signal at a predetermined second frequency through the antenna; the energy storage conversion module analyzes effective signals of the second electromagnetic wave signals to output first communication data and sends the first communication data to the charging and discharging micro-processing module; the charging and discharging micro-processing module carries out communication instruction analysis on the first communication data to generate a first instruction execution result and sends the first instruction execution result to the energy storage conversion module; the energy storage conversion module converts the first instruction execution result to generate a third electromagnetic wave signal and sends the third electromagnetic wave signal to the upper computer through the antenna.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a passive device signal management method.
Background
The wireless charging equipment is also called passive charging equipment, and the equipment is characterized in that the equipment does not have a power supply and belongs to passive equipment, but can carry out electromagnetic conversion on received electromagnetic waves to generate working power. Common passive charging devices only respond to electromagnetic waves of a certain fixed frequency.
Disclosure of Invention
The invention aims to provide a passive device signal management method aiming at the defects of the prior art, which can meet the conventional requirement of charging an energy storage module of a passive device and can be externally connected with external task devices with different functions on the traditional passive charging device, thereby improving the traditional simple passive charging device from a single electromagnetic conversion circuit to an intelligent module with service processing capability.
In order to achieve the above object, the present invention provides a passive device signal management method, which is characterized in that the method includes:
the passive equipment receives a first electromagnetic wave signal from an upper computer through an antenna according to a preset first frequency;
the energy storage conversion module of the passive device performs electromagnetic conversion processing on the first electromagnetic wave signal to output wireless power;
the energy storage conversion module uses the wireless power to perform charging operation on an energy storage device of the passive device;
when the electric energy of the energy storage device is greater than or equal to a preset energy storage upper limit, the energy storage device performs power-on reset operation on a charging and discharging micro-processing module of the passive device;
the charging and discharging micro-processing module sets the working state of the energy storage conversion module to be a signal processing state;
the antenna receives a second electromagnetic wave signal from the upper computer according to the signal processing state and a preset second frequency;
the energy storage conversion module is used for carrying out effective signal analysis on the second electromagnetic wave signal to output first communication data and sending the first communication data to the charging and discharging micro-processing module;
the charging and discharging micro-processing module carries out communication instruction analysis on the first communication data to generate a first instruction execution result, and sends the first instruction execution result to the energy storage conversion module;
and the energy storage conversion module performs digital-to-analog signal conversion on the first instruction execution result to generate a third electromagnetic wave signal, and sends the third electromagnetic wave signal to the upper computer through the antenna.
Further, the method further comprises: when the frequency of the electromagnetic wave signal received by the antenna is neither the first frequency nor the second frequency, the passive device identifies the electromagnetic wave signal as an interference signal.
Further, the method further comprises: and when the electric energy of the energy storage device is less than the preset energy storage lower limit, the energy storage device performs power-down operation on the charging and discharging micro-processing module of the passive device, and sets the working state of the energy storage conversion module to be an energy storage conversion state.
Further, the energy storage conversion module performs effective signal analysis on the second electromagnetic wave signal to output first communication data, and specifically includes:
the energy storage conversion module performs signal analysis on the second electromagnetic wave signal to generate a first signal analysis result;
and when the first signal analysis result is an effective signal, the energy storage conversion module performs analog-to-digital signal conversion operation on the second electromagnetic wave signal to output the first communication data.
Preferably, the method further comprises: and when the first signal analysis result is an invalid signal, the energy storage conversion module waits for acquiring the next electromagnetic wave signal received by the antenna.
Further, the charging and discharging micro-processing module performs communication instruction analysis on the first communication data to generate a first instruction execution result, and the method specifically includes:
the charging and discharging micro-processing module carries out communication instruction analysis on the first communication data to generate first instruction data;
the charging and discharging micro-processing module extracts a first instruction code of the first instruction data; the first instruction code comprises any instruction code of a device power-on instruction, a device power-off instruction and a transmission instruction;
when the first instruction code is an instruction code for powering on the equipment, the charging and discharging micro-processing module performs a powering on operation on the external equipment of the passive equipment and generates a first instruction execution result;
when the first instruction code is an instruction code for powering off the equipment, the charging and discharging micro-processing module performs power-down operation on the external equipment and generates a first instruction execution result;
when the first instruction code is an instruction code of a transmission instruction, the charging and discharging micro-processing module extracts a first instruction parameter of the first instruction data, sends the first instruction parameter to the external equipment, and obtains return data from the external equipment to generate a first instruction execution result.
Preferably, when the first instruction code is an instruction code for powering on a device, the charging and discharging micro-processing module performs a powering on operation on an external device of the passive device and generates the first instruction execution result, specifically including:
when the first instruction code is an instruction code for powering on the equipment, the charging and discharging micro-processing module performs a powering on operation on the external equipment;
after the power-on operation, the external equipment sends equipment reset information to the charge-discharge micro-processing module within preset peripheral reset time;
and the charging and discharging micro-processing module performs data packaging processing on the equipment reset information to generate the first instruction execution result.
Further preferably, the method further comprises:
and when the charging and discharging micro-processing module does not receive the equipment reset information within the preset peripheral reset time, the charging and discharging micro-processing module sets the first instruction execution result as equipment reset failure information.
Preferably, when the instruction code of the first instruction code is a transmission instruction, the charging and discharging micro-processing module extracts a first instruction parameter of the first instruction data, sends the first instruction parameter to the external device, and obtains return data from the external device to generate the first instruction execution result, specifically including:
when the first instruction code is an instruction code of a transmission instruction, the charging and discharging micro-processing module extracts the first instruction parameter of the first instruction data and sends the first instruction parameter to the external equipment;
the external equipment acquires the first instruction parameter, and judges the instruction validity of the first instruction parameter to generate a first judgment result;
when the first judgment result is a legal instruction, the external equipment executes the first instruction parameter to generate the return data;
the external equipment sends the return data to the charging and discharging micro-processing module;
and the charging and discharging micro-processing module performs data packaging processing on the return data to generate the first instruction execution result.
Further preferably, the method further comprises: and when the first judgment result is an illegal instruction, the external equipment sets the return data as instruction error information.
The invention provides a passive equipment signal management method, which sets at least two response frequencies: charging frequency and digital frequency. When receiving the charging frequency electromagnetic wave, the passive device converts the received electromagnetic wave energy into electric energy for storage according to the electromagnetic conversion principle; when receiving the digital-pass frequency electromagnetic wave, the passive device performs analog-to-digital conversion on the electromagnetic wave signal to generate signal data and calls the internal module to execute corresponding functions.
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Fig. 1 is a schematic diagram of a passive device signal management method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a passive device module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a passive device signal management method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, which is a schematic diagram of a passive device signal management method according to an embodiment of the present invention, the method mainly includes the following steps:
step 1, the passive device receives a first electromagnetic wave signal from an upper computer through an antenna according to a preset first frequency.
Here, the passive device specifically refers to a passive charging device. As shown in fig. 2, which is a schematic diagram of a passive device module provided in an embodiment of the present invention, a passive charging device includes: the device comprises an antenna, an energy storage conversion module, energy storage equipment, a charging and discharging micro-processing module and external equipment.
If the passive device is a passive charger, the external device may be embodied as a charging management module or a charging circuit. If the passive device is an intelligent module with storage, the external device may be a single chip with storage function or a storage management module. If the passive device is a smart lock, the external device may be embodied as a motor driven module of the lock body.
The passive device distinguishes the function of the wireless signal according to the receiving frequency, and when the received electromagnetic signal is the first frequency, the wireless signal is regarded as a charging signal, namely, only electromagnetic conversion is carried out on the electromagnetic signal of the first frequency; when the received electromagnetic signal is at the second frequency, the received electromagnetic signal is regarded as a communication signal, namely, only signal analysis is carried out on the electromagnetic signal at the second frequency.
And 2, performing electromagnetic conversion processing on the first electromagnetic wave signal by an energy storage conversion module of the passive device to output wireless power.
Here, the first frequency is a charging frequency, and when the frequency of the electromagnetic wave signal is the charging frequency, the passive device charges the internal energy storage device using an electromagnetic conversion function. Once the electric energy of the internal energy storage device exceeds the preset energy storage upper limit, the passive device stops continuously charging the energy storage device and enters a signal processing state, namely, only the electromagnetic signal using the digital-pass frequency is responded. In the digital communication response process, if the electric energy consumption of the energy storage module is below the preset energy storage lower limit, the situation that the electric power is insufficient and the charging is required to be continued is indicated, the passive device stops the response of the digital communication signal, restores the state to the energy storage conversion state and switches to the charging frequency response processing part again.
And 3, the energy storage conversion module carries out charging operation on the energy storage equipment of the passive equipment according to the wireless power.
And 4, when the electric energy of the energy storage device is greater than or equal to the preset energy storage upper limit, the energy storage device performs power-on reset operation on the charging and discharging micro-processing module of the passive device.
There are various solutions for identifying the success of power-on reset of the charging and discharging micro-processing module, and one of them is to set a status bit for identification, and the other is to send back reset information and send it to an upper computer through an energy storage conversion module by using an antenna. The specific design is determined according to the actual use requirement of a user.
And 5, setting the working state of the energy storage conversion module to be a signal processing state by the charging and discharging micro-processing module.
Here, after the signal processing state is successfully set, the energy storage conversion module modifies the receiving frequency setting of the signal, and switches from the first frequency to the second frequency, that is, switches from the charging frequency to the digital-to-analog frequency.
And 6, receiving a second electromagnetic wave signal from the upper computer by the antenna according to the signal processing state and a preset second frequency.
the method specifically comprises the following steps: step 71, the energy storage conversion module performs signal analysis on the second electromagnetic wave signal to generate a first signal analysis result;
here, if the carrier signal format of the second electromagnetic wave signal does not meet the signal requirement, the passive device may consider the current signal as a noise signal or other invalid signal, does not continue to make an analytic response operation, and waits for receiving the next electromagnetic wave signal from the antenna again;
step 72, when the first signal analysis result is an effective signal, the energy storage conversion module performs analog-to-digital signal conversion operation on the second electromagnetic wave signal to output first communication data;
and 73, the energy storage conversion module sends the first communication data to the charging and discharging micro-processing module.
the method specifically comprises the following steps: step 81, the charging and discharging micro-processing module performs communication instruction analysis on the first communication data to generate first instruction data;
here, the first instruction data includes: a first instruction code and a first instruction parameter, wherein the first instruction code comprises: any instruction code of equipment power-on, equipment power-off and transmission instruction; the first instruction parameter is additional data of the first instruction code, and for some instructions, the first instruction parameter may be null, such as a device power-on instruction and a device power-off instruction;
the first instruction data has different specific expression forms aiming at different types of the external equipment; if the external device is a charging management module or a charging circuit, the first instruction data may be a set of serial numbers or a logic level signal; if the external device is a single chip microcomputer with a storage function or a storage management module, the first instruction data is a group of string numbers with specific functional instructions; if the external device is a motor driving module of the lock body, the first instruction data may be a set of serial numbers or a logic level signal; this embodiment is described for only one set of string numbers;
step 82, extracting a first instruction code of the first instruction data by the charging and discharging micro-processing module;
step 83, when the first instruction code is an instruction code for powering on the device, the charging and discharging micro-processing module performs a powering on operation on the external device and generates a first instruction execution result,
the method specifically comprises the following steps: step 831, when the first instruction code is an instruction code for powering on the device, the charging and discharging micro-processing module performs a powering on operation on the external device;
step 832, after the external device is powered on, sending device reset information to the charging and discharging micro-processing module within a preset peripheral reset time;
step 833, the charging and discharging micro-processing module performs data packing processing on the device reset information to generate a first instruction execution result;
here, if the reset information from the external device is not received within the preset reset response time, the charging and discharging micro-processing module further packages the reset failure information to generate a first instruction execution result according to the reset overtime of the external device; the reset information has different presentation modes for different types of external devices, such as a single status bit or a group of string numbers;
step 84, when the first instruction code is an instruction code for powering off the equipment, the charging and discharging micro-processing module performs power-down operation on the external equipment and generates a first instruction execution result;
step 85, when the first instruction code is an instruction code of the transmission instruction, the charging and discharging micro-processing module extracts a first instruction parameter of the first instruction data, sends the first instruction parameter to the external equipment, acquires return data from the external equipment to generate a first instruction execution result,
the method specifically comprises the following steps: step 851, when the first instruction code is a transmission instruction, extracting a first instruction parameter of the first instruction data by the charging and discharging micro-processing module, and sending the first instruction parameter to the external equipment;
step 852, the external device acquires a first instruction parameter, and performs instruction validity judgment on the first instruction parameter to generate a first judgment result;
step 853, when the first judgment result is a legal instruction, the external device executes the first instruction parameter to generate return data;
step 854, the external equipment sends return data to the charging and discharging micro-processing module;
step 855, the charging and discharging micro-processing module performs data packing on the returned data to generate a first instruction execution result;
and 86, the charging and discharging micro-processing module sends the first instruction execution result to the energy storage conversion module.
And 9, the energy storage conversion module performs digital-to-analog signal conversion on the first instruction execution result to generate a third electromagnetic wave signal, and the third electromagnetic wave signal is sent to the upper computer through the antenna.
As shown in fig. 3, which is a schematic diagram of a passive device signal management method according to a second embodiment of the present invention, the method mainly includes the following steps:
and step 101, the passive device receives a second electromagnetic wave signal from the upper computer through the antenna according to a preset second frequency.
Here, the second embodiment is mainly described with respect to a flow in which the host computer performs instruction interaction with the external device through the passive device. If the passive device is a passive intelligent lock, the external device is an intelligent lock motor driving module.
And 102, the energy storage conversion module performs effective signal analysis on the second electromagnetic wave signal to output first communication data, and sends the first communication data to the charge and discharge micro-processing module.
And 103, the charging and discharging micro-processing module performs communication instruction analysis on the first communication data to generate first instruction data.
Here, the first instruction data includes: a first instruction code and a first instruction parameter.
And 104, extracting a first instruction code of the first instruction data by the charging and discharging micro-processing module.
And 105, when the first instruction code is a transmission instruction, extracting a first instruction parameter of the first instruction data by the charging and discharging micro-processing module, and sending the first instruction parameter to the external equipment.
When the first instruction code is a transmission instruction, the first instruction parameter is described to include specific operation instruction content for the external device. According to the above, where the external device is specifically an intelligent lock motor driving module, the operation instruction included in the specific first instruction parameter includes: an unlock command and a lock close command.
And 106, the external equipment acquires the first instruction parameter, and performs instruction validity judgment on the first instruction parameter to generate a first judgment result.
In step 107, the external device determines whether the first determination result is a legal instruction, and if the first determination result is a legal instruction, the process goes to step 108, and if the first determination result is an illegal instruction, the process goes to step 109.
In step 108, the external device executes the first instruction parameter to generate return data, and goes to step 110.
Here, if the first instruction parameter is an unlocking instruction or a locking instruction, the intelligent lock motor driving module drives the intelligent lock motor to execute a motor unlocking operation or a motor locking operation, and sets return data according to a motor working state after the motor completes the operation: success/failure of unlocking, success/failure of locking.
And step 109, the external device sets the return data as instruction error information.
Here, if the first instruction parameter is neither an unlocking instruction nor a locking instruction, the intelligent lock motor driving module considers that the received instruction is wrong, and sets the returned data as instruction error information.
And step 110, the external equipment sends return data to the charging and discharging micro-processing module.
And step 111, the charging and discharging micro-processing module performs data packaging processing on the returned data to generate a first instruction execution result, and sends the first instruction execution result to the energy storage conversion module.
And 112, performing digital-to-analog signal conversion on the first instruction execution result by the energy storage conversion module to generate a third electromagnetic wave signal, and sending the third electromagnetic wave signal to the upper computer through the antenna.
The invention provides a passive equipment signal management method, which sets at least two response frequencies: charging frequency and digital frequency. When receiving the charging frequency electromagnetic wave, the passive device converts the received electromagnetic wave energy into electric energy for storage according to the electromagnetic conversion principle; when receiving the digital-pass frequency electromagnetic wave, the passive device performs analog-to-digital conversion on the electromagnetic wave signal to generate signal data and calls the internal module to execute corresponding functions. By using the method of the invention, the conventional requirement of charging the energy storage module of the passive equipment can be met, and external task equipment with different functions can be externally connected to the traditional passive charging equipment, so that the traditional simple passive charging equipment is improved from a single electromagnetic conversion circuit to an intelligent module with service processing capability.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A passive device signal management method, the method comprising:
the passive equipment receives a first electromagnetic wave signal from an upper computer through an antenna according to a preset first frequency;
the energy storage conversion module of the passive device performs electromagnetic conversion processing on the first electromagnetic wave signal to output wireless power;
the energy storage conversion module uses the wireless power to perform charging operation on an energy storage device of the passive device;
when the electric energy of the energy storage device is greater than or equal to a preset energy storage upper limit, the energy storage device performs power-on reset operation on a charging and discharging micro-processing module of the passive device;
the charging and discharging micro-processing module sets the working state of the energy storage conversion module to be a signal processing state;
the antenna receives a second electromagnetic wave signal from the upper computer according to the signal processing state and a preset second frequency;
the energy storage conversion module is used for carrying out effective signal analysis on the second electromagnetic wave signal to output first communication data and sending the first communication data to the charging and discharging micro-processing module;
the charging and discharging micro-processing module carries out communication instruction analysis on the first communication data to generate a first instruction execution result, and sends the first instruction execution result to the energy storage conversion module;
and the energy storage conversion module performs digital-to-analog signal conversion on the first instruction execution result to generate a third electromagnetic wave signal, and sends the third electromagnetic wave signal to the upper computer through the antenna.
2. The passive device signal management method of claim 1, further comprising:
when the frequency of the electromagnetic wave signal received by the antenna is neither the first frequency nor the second frequency, the passive device identifies the electromagnetic wave signal as an interference signal.
3. The passive device signal management method of claim 1, further comprising:
and when the electric energy of the energy storage device is less than the preset energy storage lower limit, the energy storage device performs power-down operation on the charging and discharging micro-processing module of the passive device, and sets the working state of the energy storage conversion module to be an energy storage conversion state.
4. The passive device signal management method according to claim 1, wherein the energy storage conversion module performs effective signal analysis on the second electromagnetic wave signal to output first communication data, and specifically includes:
the energy storage conversion module performs signal analysis on the second electromagnetic wave signal to generate a first signal analysis result;
and when the first signal analysis result is an effective signal, the energy storage conversion module performs analog-to-digital signal conversion operation on the second electromagnetic wave signal to output the first communication data.
5. The passive device signal management method of claim 4, further comprising:
and when the first signal analysis result is an invalid signal, the energy storage conversion module waits for acquiring the next electromagnetic wave signal received by the antenna.
6. The passive device signal management method according to claim 1, wherein the charging and discharging micro-processing module performs communication instruction analysis on the first communication data to generate a first instruction execution result, and specifically includes:
the charging and discharging micro-processing module carries out communication instruction analysis on the first communication data to generate first instruction data;
the charging and discharging micro-processing module extracts a first instruction code of the first instruction data; the first instruction code comprises any instruction code of a device power-on instruction, a device power-off instruction and a transmission instruction;
when the first instruction code is an instruction code for powering on the equipment, the charging and discharging micro-processing module performs a powering on operation on the external equipment of the passive equipment and generates a first instruction execution result;
when the first instruction code is an instruction code for powering off the equipment, the charging and discharging micro-processing module performs power-down operation on the external equipment and generates a first instruction execution result;
when the first instruction code is an instruction code of a transmission instruction, the charging and discharging micro-processing module extracts a first instruction parameter of the first instruction data, sends the first instruction parameter to the external equipment, and obtains return data from the external equipment to generate a first instruction execution result.
7. The passive device signal management method according to claim 6, wherein when the first instruction code is an instruction code for powering on a device, the charging and discharging micro-processing module performs a powering on operation on an external device of the passive device and generates the first instruction execution result, specifically including:
when the first instruction code is an instruction code for powering on the equipment, the charging and discharging micro-processing module performs a powering on operation on the external equipment;
after the power-on operation, the external equipment sends equipment reset information to the charge-discharge micro-processing module within preset peripheral reset time;
and the charging and discharging micro-processing module performs data packaging processing on the equipment reset information to generate the first instruction execution result.
8. The passive device signal management method of claim 7, further comprising:
and when the charging and discharging micro-processing module does not receive the equipment reset information within the preset peripheral reset time, the charging and discharging micro-processing module sets the first instruction execution result as equipment reset failure information.
9. The passive device signal management method according to claim 6, wherein when the instruction code of the first instruction code is a transmission instruction, the charge and discharge micro-processing module extracts a first instruction parameter of the first instruction data, sends the first instruction parameter to the external device, and obtains return data from the external device to generate the first instruction execution result, specifically including:
when the first instruction code is an instruction code of a transmission instruction, the charging and discharging micro-processing module extracts the first instruction parameter of the first instruction data and sends the first instruction parameter to the external equipment;
the external equipment acquires the first instruction parameter, and judges the instruction validity of the first instruction parameter to generate a first judgment result;
when the first judgment result is a legal instruction, the external equipment executes the first instruction parameter to generate the return data;
the external equipment sends the return data to the charging and discharging micro-processing module;
and the charging and discharging micro-processing module performs data packaging processing on the return data to generate the first instruction execution result.
10. The passive device signal management method of claim 9, further comprising:
and when the first judgment result is an illegal instruction, the external equipment sets the return data as instruction error information.
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| CN101807331A (en) * | 2010-03-25 | 2010-08-18 | 深圳绿拓科技有限公司 | Passive wireless sensing device |
| CN205002895U (en) * | 2015-09-30 | 2016-01-27 | 杭州凯源电子有限公司 | Passive temperature measuring device |
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