Smoke sensor and optical sensing system

Abstract

The invention discloses a smoke sensor and an optical sensing system. The smoke sensor comprises a light source, an optical sensor, a first processing circuit and a second processing circuit. The light source generates light. The optical sensor senses optical data generated according to light, and includes: a first oscillator generating a first oscillation signal having a first oscillation frequency; the second oscillator generates a second oscillation signal with a second oscillation frequency. The first processing circuit generates a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, receives a first oscillation signal and then obtains a first actual oscillation time when the first oscillator actually responds to the first instruction. Wherein the first processing circuit further calculates a time relationship between the first expected oscillation time and the first actual oscillation time, and generates a second instruction to instruct the second oscillator to oscillate for a second expected oscillation time according to the time relationship. The second processing circuit is used for controlling the smoke sensor to generate a first alarm according to the time relation.

Description

Technical Field

[0001] The present invention relates to a smoke sensor and an optical sensing system, and in particular to a smoke sensor and an optical sensing system capable of compensating for signal attenuation caused by high temperature. Background Art

[0002] Existing optical sensors, such as image sensors, generally include a plurality of pixels and are used to sense optical data (e.g., images) by exposing the pixels. More specifically, the pixels generate sensing signals corresponding to the received light, and such sensing signals correspond to the optical data sensed by the optical sensor. However, if the temperature around the optical sensor is high, the elements of the optical sensor may be affected by the high temperature, causing the sensing signal to attenuate. Summary of the invention

[0003] An object of the present invention is to disclose an optical sensing system capable of compensating for signal attenuation caused by high temperature.

[0004] Another object of the present invention is to disclose a smoke sensor that can quickly generate an alarm in response to high temperature and avoid false alarms.

[0005] An embodiment of the present invention discloses a smoke sensor, comprising a light source, an optical sensor, a first processing circuit and a second processing circuit. The light source is used to generate light. The optical sensor is used to sense optical data generated according to the light, including: a first oscillator, used to generate a first oscillation signal with a first oscillation frequency; a second oscillator, used to generate a second oscillation signal with a second oscillation frequency, and the second oscillation frequency is different from the first oscillation frequency. The first processing circuit is used to generate a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, and to receive the first oscillation signal and then obtain the first actual oscillation time that the first oscillator actually oscillates in response to the first instruction, wherein the first processing circuit further calculates the time relationship between the first expected oscillation time and the first actual oscillation time, and generates a second instruction according to the time relationship to instruct the second oscillator to oscillate for the second expected oscillation time. The second processing circuit is used to control the smoke sensor to generate a first alarm according to the time relationship.

[0006] In one embodiment, the time relationship is used to generate the first alarm but not to calibrate the oscillation signal of the second oscillator.

[0007] Another embodiment of the present invention discloses an optical sensing system including an optical sensor and a first processing circuit. The optical sensor is used to sense optical data, and includes: a first oscillator, used to generate a first oscillation signal with a first oscillation frequency; and a second oscillator, used to generate a second oscillation signal with a second oscillation frequency, the second oscillation frequency is different from the first oscillation frequency, the optical sensor calculates the exposure time according to one of the first oscillation signal and the second oscillation signal, and calculates the frame time interval according to the other of the first oscillation signal and the second oscillation signal. The first processing circuit is used to generate a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, and is used to receive the first oscillation signal and then obtain the first actual oscillation time that the first oscillator actually oscillates in response to the first instruction, wherein the first processing circuit further calculates the time relationship between the first expected oscillation time and the first actual oscillation time, and generates a second instruction according to the time relationship to instruct the second oscillator to oscillate for the second expected oscillation time.

[0008] According to the above embodiments, the signal attenuation of the sensing signal of the optical sensor caused by high temperature can be compensated. In addition, the smoke sensor disclosed in the present invention can issue a fire alarm more quickly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. 4 is a block diagram of an optical sensing system according to an embodiment of the present invention.

[0010] Figure 2 FIG. 4 is a block diagram of an optical sensing system according to another embodiment of the present invention.

[0011] Figure 3 According to an embodiment of the present invention, Figure 1 and Figure 2 Corrected and uncorrected sensing signals of an optical sensor.

[0012] Figure 4 FIG. 4 is a block diagram of a smoke sensor according to an embodiment of the present invention.

[0013] Figure 5 According to an embodiment of the present invention, Figure 4 A schematic diagram of the appearance of a smoke sensor is shown.

[0014] Figure 6 A block diagram of a TOF (Time of Flight) system according to an embodiment of the present invention is shown.

[0015] Figure 7 A block diagram of an automatic cleaning machine according to an embodiment of the present invention is shown.

[0016] The reference numerals are described as follows:

[0017] 100 Optical Sensing System

[0018] 101 Optical Sensor

[0019] 105 pixel array

[0020] 200 Optical Sensing System

[0021] 400 Smoke Sensor

[0022] 401 Alarm control circuit

[0023] 403 Alarm Generating Device

[0024] 501 Housing

[0025] 600 TOF System

[0026] 700 Automatic Sweeper

[0027] H Hand

[0028] h1 hole

[0029] L-light

[0030] LS light source

[0031] OC_A Oscillator

[0032] OC_B Oscillator

[0033] OS_1 first oscillation signal

[0034] OS_2 second oscillation signal

[0035] PC_1 first processing circuit

[0036] PC_2 Second processing circuit

[0037] Sr working surface

[0038] It_1 First Port

[0039] It_2 Second Port DETAILED DESCRIPTION

[0040] The present invention will be described below with multiple embodiments. Please note that the "first", "second" and similar descriptions in the following description are only used to define different elements, parameters, data, signals or steps. They are not used to limit their order. For example, the first device and the second device can be different devices with the same structure.

[0041] Figure 1FIG. 1 is a block diagram of an optical sensing system 100 according to an embodiment of the present invention. Figure 1 As shown, the optical sensing system 100 includes an optical sensor 101 and a first processing circuit PC_1. The optical sensor 101 includes an oscillator OC_A and an oscillator OC_B. In the following embodiments, the first oscillator refers to an oscillator used as a calibration reference, and the second oscillator refers to a target oscillator to be calibrated. Figure 1 In an embodiment, the oscillator OC_A serves as a first oscillator, and the oscillator OC_B serves as a second oscillator. In addition, the optical sensor 101 may further include a first port It_1 and a second port It_2. The oscillator OC_A and the first processing circuit PC_1 may communicate through the first port It_1, and the oscillator OC_B and the first processing circuit PC_1 may communicate through the second port It_2. In an embodiment, the first port It_1 and the second port It_2 are GPIO (General-purpose input / output).

[0042] exist Figure 1 In the embodiment of the present invention, the oscillator OC_A is used to generate a first oscillation signal OS_1 having a first oscillation frequency. The oscillator OC_B is used to generate a second oscillation signal OS_2 having a second oscillation frequency different from the first oscillation frequency. The optical sensor 101 calculates the exposure time according to one of the first oscillation signal OS_1 and the second oscillation signal OS_2, and calculates the frame time interval according to the other of the first oscillation signal OS_1 and the second oscillation signal OS_2. Figure 1 In the embodiment of the present invention, the optical sensor 101 calculates the exposure time according to the first oscillation signal OS_1, and calculates the frame time interval according to the second oscillation signal OS_2. The exposure time is the time for the pixels in the pixel array 105 in the optical sensor 100 to be exposed. In addition, the frame time interval refers to the time interval between the sensing start times of two consecutive frames. In this embodiment, the first oscillation frequency is higher than the second oscillation frequency.

[0043] The first processing circuit PC_1 generates a first instruction CM_1 to instruct the oscillator OC_A to oscillate for a first expected oscillation time T_EO1. However, the oscillator OC_A may only oscillate for a first actual oscillation time T_RO1 in response to the first instruction CM_1, rather than oscillating for the first expected oscillation time T_EO1. The first processing circuit PC_1 may obtain the first actual oscillation time T_RO1 by calculating the signal generated by the oscillator OC_A in response to the first instruction CM_1. For example, the oscillator OC_A generates a first oscillation signal OS_1 in response to the first instruction CM_1, and the first processing circuit PC_1 receives the first oscillation signal OS_1, and then obtains the first actual oscillation time T_RO1 by calculating the first oscillation signal OS_1.

[0044] Ideally, the first expected oscillation time T_EO1 should be equal to the first actual oscillation time T_RO1. However, due to the influence of high temperature or any other factors on the oscillator OC_A, the first expected oscillation time T_EO1 and the first actual oscillation time T_RO1 may have a time difference. Therefore, the first processing circuit PC_1 further calculates the time relationship between the first expected oscillation time T_EO1 and the first actual oscillation time T_RO1. The time relationship may be, for example, a time ratio between the first expected oscillation time T_EO1 and the first actual oscillation time T_RO1. After obtaining the time relationship, the first processing circuit PC_1 generates a second instruction CM_2 according to the time relationship to instruct the oscillator OC_B to oscillate for the second expected oscillation time T_EO2. In another embodiment, the time relationship is a time difference.

[0045] In a practical example, the first processing circuit PC_1 generates a first instruction CM_1 to instruct the oscillator OC_A to oscillate for 500us (the first expected oscillation time T_EO1), while the first actual oscillation time T_RO1 is 450us. In this case, the time ratio is 450 / 500=0.9. After the first processing circuit PC_1 obtains the time ratio of 0.9, the first processing circuit PC_1 generates a second instruction CM_2 according to the time ratio to instruct the oscillator OC_B to oscillate for the second expected oscillation time T_EO2. For example, if the oscillator OC_B is expected to oscillate for 1000ms, the first processing circuit PC_1 will generate a second instruction CM_2 to instruct the oscillator OC_B to oscillate for 1000 / 0.9≈1111ms. In this way, the actual oscillation time of the oscillator OC_B corresponding to the second instruction CM_2 is 1000ms, so that the time drift caused by high temperature can be compensated. Please note that the time ratio can also be used to calibrate the first oscillator (oscillator OC_A) itself, and is not limited to calibrating the second oscillator (oscillator OC_B).

[0046] In one embodiment, the oscillator OC_B cannot operate normally until it is compensated according to the time relationship. For example, before the time relationship is obtained, the first processing circuit PC_1 generates a third instruction to instruct the oscillator OC_B to oscillate for the third expected oscillation time. However, since the oscillator OC_B has not been compensated, the actual oscillation time of the oscillator OC_B corresponding to the third instruction is not equal to the third expected oscillation time. Then, according to the above embodiment, the first processing circuit PC_1 generates a second instruction CM_2 according to the time relationship to instruct the oscillator OC_B to oscillate for the second expected oscillation time T_EO2, so that the second actual oscillation time that the oscillator OC_B actually oscillates in response to the second instruction CM_2 is the same as the third expected oscillation time.

[0047] The optical sensing system disclosed in the present invention is not limited to Figure 1 An optical sensing system 100 is shown. Figure 2 FIG. 2 shows a block diagram of an optical sensing system 200 according to another embodiment of the present invention. The optical sensing system 200 includes all components of the optical sensing system 100 except the first port It_1. Therefore, in this embodiment, the first processing circuit PC_1 cannot obtain the actual oscillation time of the oscillator OC_A. In this case, the oscillator OC_A serves as the second oscillator, and the oscillator OC_B serves as the first oscillator.

[0048] exist Figure 2 In an embodiment of the present invention, the oscillator OC_B is used to generate a first oscillation signal OS_1 having a first oscillation frequency. The oscillator OC_A is used to generate a second oscillation signal OS_2 having a second oscillation frequency different from the first oscillation frequency. The optical sensor 101 calculates the exposure time according to the second oscillation signal OS_2, and calculates the frame time interval according to the first oscillation signal OS_1. In an embodiment, the first oscillation frequency is lower than the second oscillation frequency.

[0049] The first processing circuit PC_1 generates a first instruction CM_1 to instruct the oscillator OC_B to oscillate for a first expected oscillation time T_EO1. The first processing circuit PC_1 also obtains a first actual oscillation time T_RO1 when the oscillator OC_B actually oscillates in response to the first instruction CM_1. For example, the oscillator OC_B generates a first oscillation signal OS_1 corresponding to the first instruction CM_1, and the first processing circuit PC_1 obtains the first actual oscillation time T_RO1 when the oscillator OC_B actually oscillates in response to the first instruction CM_1. The step of obtaining the first actual oscillation time T_RO1 through the oscillator OC_B can be the same as Figure 1 The steps of obtaining the first actual oscillation time T_RO1 through the oscillator OC_A are the same as shown, and thus will not be described again.

[0050] Ideally, the first expected oscillation time T_EO1 should be equal to the first actual oscillation time T_RO1. However, due to the influence of high temperature or other factors on the oscillator OC_B, the first expected oscillation time T_EO1 and the first actual oscillation time T_RO1 may have a time difference. Therefore, the first processing circuit PC_1 further calculates the time relationship between the first expected oscillation time T_EO1 and the first actual oscillation time T_RO1. The time relationship may be the above-mentioned time ratio. After obtaining the time relationship, the first processing circuit PC_1 generates a second instruction CM_2 according to the time relationship to instruct the oscillator OC_A to oscillate for the second expected oscillation time T_EO2. In one embodiment, the first processing circuit PC_1 may generate an instruction to instruct the oscillator OC_B to oscillate according to the time relationship. In other words, the time relationship may also be used to calibrate the first oscillator (oscillator OC_B), not limited to calibrating the second oscillator (oscillator OC_A).

[0051] In a practical example, the first processing circuit PC_1 generates a first instruction CM_1 to instruct the oscillator OC_B to oscillate for 1000ms (the first expected oscillation time T_EO1), and the first actual oscillation time T_RO1 is 900ms. In this case, the time ratio is 900 / 1000=0.9. After the first processing circuit PC_1 obtains the time ratio of 0.9, the first processing circuit PC_1 generates a second instruction CM_2 according to the time ratio to instruct the oscillator OC_A to oscillate for the second expected oscillation time T_EO2. For example, if the oscillator OC_A is expected to oscillate for 500us, the first processing circuit PC_1 will generate a second instruction CM_2 to instruct the oscillator OC_A to oscillate for 500 / 0.9≈555ms. In this way, the actual oscillation time of the oscillator OC_A corresponding to the second instruction CM_2 is 500us, so that the time drift caused by high temperature can be compensated.

[0052] In one embodiment, before the first processing circuit PC_1 calibrates the oscillator OC_B, the oscillator OC_B is calibrated according to the reference time defined by the oscillator OC_A. For example, 1 second is defined as the time interval for the second oscillation signal OS_2 to oscillate 2M times, and the reference number of oscillations of the first oscillation signal OS_1 within the defined 1 second is calculated. For example, if the first oscillation signal OS_1 oscillates 32k times within the defined 1 second, the first processing circuit PC_1 may record the reference number as 32k, thereby determining that the time for the first oscillation signal OS_1 to oscillate 32k times is 1 second. Similarly, the first processing circuit PC_1 may determine the above-mentioned first actual oscillation time T_RO1 according to the number of oscillations of the first oscillation signal OS_1. This rule may also be applied to any other actual oscillation time.

[0053] When the calibration of the oscillator OC_B is completed, the first processing circuit PC_1 can generate instructions according to the time relationship to control the oscillation time required for the oscillator OC_B to oscillate. Figure 2 As shown in the embodiment, the first processing circuit PC_1 generates a first instruction CM_1 to instruct the oscillator OC_B to oscillate for the first expected oscillation time T_EO1. However, in this case, the first actual oscillation time T_RO1 is different from the first expected oscillation time T_EO1. Therefore, after obtaining the time relationship, the first processing circuit PC_1 further generates a fourth instruction according to the time relationship to instruct the oscillator OC_B to oscillate for the fourth expected oscillation time, so that the third actual oscillation time when the oscillator OC_B actually oscillates in response to the fourth instruction is the same as the first expected oscillation time.

[0054] Figure 3 According to an embodiment of the present invention, Figure 1 and Figure 2 Corrected and uncorrected sensing signals of an optical sensor. Figure 3 The above figure shows the sensed signals of the oscillator OC_A and the oscillator OC_B after calibration. Figure 3 The lower graph of shows the uncorrected sense signals of oscillator OC_A and oscillator OC_B. Figure 3 The horizontal axis represents time, and the vertical axis represents the amplitude of the sensing signal. Figure 3 T1 and T2 represent the temperature around the optical sensor 101, and T2 is higher than T1. Figure 3 As shown in FIG. 1 , when the temperature is a higher temperature T2, the sensing signal may be attenuated. However, the attenuation condition in the upper figure is lower than the attenuation condition in the lower figure. Therefore, the calibration of the oscillator OC_A and the oscillator OC_B can reduce the signal attenuation caused by high temperature.

[0055] The optical sensor 101 can be applied to any electronic device. In one embodiment, the optical sensor 101 is applied to a smoke sensor. Figure 4 FIG. 4 is a block diagram of a smoke sensor 400 according to an embodiment of the present invention. Figure 4 As shown, the smoke sensor 400 includes a light source LS, a second processing circuit PC_2, the optical sensor 101 and the first processing circuit PC_1. The light source LS is used to emit light L. The optical sensor 101 is used to sense optical data generated according to the light L. For example, the optical sensor 101 senses optical data generated according to scattered light or reflected light of the light L.

[0056] The optical sensor 101 and the first processing circuit PC_1 can be operated according to the above-mentioned embodiment. Thus, the above-mentioned time relationship can be obtained. After obtaining the time relationship, the second processing circuit PC_2 controls the smoke sensor 400 to generate a first alarm according to the time relationship. In more detail, if the time relationship is not within a specific range or is not a specific value, the second processing circuit PC_2 controls the smoke sensor 400 to generate a first alarm. For example, if the time relationship is a time ratio of 1, it means that the temperature has not increased, so that the oscillators OC_A and OC_B will not drift in time. On the contrary, if the time relationship is a time ratio that is not 1, it means that the temperature may increase due to a fire or an event that may cause a fire. The first processing circuit PC_1 and the second processing circuit PC_2 can be two different processing circuits, or integrated into a single processing circuit.

[0057] For existing smoke sensors, if there is no fire, there is no smoke, and therefore there is no scattered light of the light L or only a small amount of scattered light of the light L. In this case, the optical data (e.g., image) sensed by the optical sensor 101 has a first light intensity. On the contrary, if a fire occurs, the smoke will cause the light L to generate a large amount of scattered light, and therefore the optical data sensed by the optical sensor 101 has a second light intensity. Therefore, the smoke sensor 400 can generate an alarm based on the light intensity sensed by the optical sensor 101. However, this mechanism may result in false alarms because the smoke may be caused by other factors such as cooking instead of a fire.

[0058] In order to improve such a problem, the smoke sensor 400 disclosed in the present invention can generate an alarm according to the time relationship. In one embodiment, the smoke sensor 400 further includes an alarm control circuit 401 and an alarm generating device 403. The alarm control circuit 401 can be integrated into the second processing circuit PC_2. In one embodiment, the second processing circuit PC_2 controls the alarm generating device 403 to generate a first alarm according to the time relationship before controlling the alarm generating device 403 to generate a second alarm according to the optical data. In other words, the smoke sensor 400 can generate two levels of alarms: first, a first alarm is generated according to the time relationship (i.e., reacting to high temperature), and then a second alarm is generated according to the optical data (i.e., reacting to smoke).

[0059] Please also note that in one embodiment, the optical sensor 101 of the smoke sensor 400 includes a first oscillator but does not include a second oscillator. In this case, the time relationship generated based on the oscillation signal of the first oscillator can still be used to generate an alarm, but will not be used to correct the oscillation signal of the second oscillator. In another embodiment, the optical sensor 101 of the smoke sensor 400 still includes a first oscillator and a second oscillator. However, the time relationship generated based on the oscillation signal of the first oscillator is used to generate an alarm, but will not be used to correct the oscillation signal of the second oscillator.

[0060] Such an action can have a variety of advantages. For example, if a machine fails and burns, causing a fire, the temperature rises very quickly and before smoke is generated. Therefore, an event that may cause a fire can be detected very soon before the fire actually occurs. In addition, the two-stage alarm can improve the situation of false fire alarms. For example, if a first alarm corresponding to a high temperature rise occurs, and then a second alarm corresponding to smoke occurs, the user can determine that a fire has indeed occurred.

[0061] In another embodiment, the second processing circuit PC_2 controls the alarm generating device 403 to generate the first alarm based on the optical data and the time relationship. In other words, the second processing circuit PC_2 controls the alarm generating device 403 to generate the first alarm only when the temperature rises and there is smoke. In this way, the existing false alarms caused by smoke not generated by fire can be avoided.

[0062] Figure 5 According to an embodiment of the present invention, Figure 4 FIG. 4 is a schematic diagram of the appearance of the smoke sensor 400 shown in FIG. 4 . Please also understand that the smoke sensor disclosed in the present invention is not limited to such an example. Figure 5 As shown, the smoke sensor 400 includes a housing 501 having holes (only the hole h1 is indicated by a symbol). Figure 4 The components shown may be disposed within the housing 501. The smoke may enter the housing 501 and trigger an alarm.

[0063] In addition to smoke sensors, the optical sensing system disclosed in the present invention can also be applied to other electronic devices. Figure 6 FIG. 4 is a block diagram of a TOF (Time of Flight) system according to an embodiment of the present invention. Figure 6 As shown, the TOF system 600 includes a light source LS, an optical sensor 101, and a first processing circuit PC_1. The optical sensor 101 is used to sense optical data generated according to the light L. For example, the optical sensor 101 senses optical data generated according to the reflected light of the light L. The first processing circuit PC_1 is used to calculate the position of an object (e.g., a hand H) according to the optical data.

[0064] The optical sensor 101 and the first processing circuit PC_1 can operate according to the above embodiment to compensate the oscillators OC_A and OC_B in the optical sensor 101. Therefore, even if the temperature around the TOF system 600 increases, the TOF system 600 can still operate normally. Figure 4 The smoke sensor 400 shown may be integrated into a TOF system 600 .

[0065] Figure 7 FIG. 7 is a block diagram of an automatic cleaning machine 700 according to an embodiment of the present invention. Figure 7 As shown, the automatic cleaning machine 700 includes a light source LS, an optical sensor 101, and a first processing circuit PC_1. The light source LS is used to emit light L to a working surface Sr (e.g., the ground). The optical sensor 101 is used to sense optical data generated based on the light L. For example, the optical sensor 101 senses optical data generated based on the reflected light of the light L. The first processing circuit PC_1 is used to calculate the position of the automatic cleaning machine 700 based on the optical data. The optical sensor 101 and the first processing circuit PC_1 can operate according to the above-mentioned embodiment to compensate for the oscillator OC_A and the oscillator OC_B in the optical sensor 101. Therefore, even if the temperature around the automatic cleaning machine 700 increases, the automatic cleaning machine 700 can still operate smoothly. Figure 4 The smoke sensor 400 shown may be integrated into an automatic sweeper 700 .

[0066] According to the above embodiments, the signal attenuation of the sensing signal of the optical sensor caused by high temperature can be compensated. In addition, the smoke sensor disclosed in the present invention can issue a fire alarm more quickly and accurately.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A smoke sensor, characterized in that: include: A light source, for generating light; An optical sensor, for sensing optical data generated according to the light, comprising: A first oscillator, used to generate a first oscillation signal with a first oscillation frequency; A second oscillator, for generating a second oscillation signal with a second oscillation frequency, the second oscillation frequency being different from the first oscillation frequency; a first processing circuit, for generating a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, and for receiving the first oscillation signal and then obtaining a first actual oscillation time at which the first oscillator actually oscillates in response to the first instruction, wherein the first processing circuit further calculates a time relationship between the first expected oscillation time and the first actual oscillation time, and generates a second instruction according to the time relationship to instruct the second oscillator to oscillate for a second expected oscillation time; and The second processing circuit is used to control the smoke sensor to generate a first alarm according to the time relationship.

2. The smoke sensor according to claim 1, characterized in that: The second processing circuit controls the smoke sensor to generate the first alarm according to the time relationship before controlling the smoke sensor to generate the second alarm according to the optical data.

3. The smoke sensor according to claim 1, characterized in that: The second processing circuit controls the smoke sensor to generate the first alarm according to the optical data and the time relationship.

4. The smoke sensor according to claim 1, wherein: Before obtaining the time relationship, the first processing circuit further generates a third instruction to instruct the second oscillator to oscillate for a third expected oscillation time; The first processing circuit generates the second instruction according to the time relationship to instruct the second oscillator to oscillate the second expected oscillation time, so that the second actual oscillation time actually oscillated by the second oscillator in response to the second instruction is the same as the third expected oscillation time.

5. The smoke sensor according to claim 1, characterized in that: The optical sensor calculates an exposure time according to one of the first oscillation signal and the second oscillation signal, and calculates a frame time interval according to the other of the first oscillation signal and the second oscillation signal.

6. The smoke sensor according to claim 1, characterized in that: The first oscillation frequency is higher than the second oscillation frequency.

7. The smoke sensor according to claim 6, characterized in that: The optical sensor calculates an exposure time according to the first oscillation signal, and calculates a frame time interval according to the second oscillation signal.

8. The smoke sensor according to claim 1, characterized in that: The first oscillation frequency is lower than the second oscillation frequency.

9. The smoke sensor according to claim 8, characterized in that: The optical sensor calculates a frame time interval according to the first oscillation signal, and calculates an exposure time according to the second oscillation signal.

10. The smoke sensor according to claim 1, characterized in that: The first processing circuit further generates a fourth instruction according to the time relationship to instruct the first oscillator to oscillate for a fourth expected oscillation time, so that a third actual oscillation time actually oscillated by the first oscillator in response to the fourth instruction is the same as the first expected oscillation time.

11. The smoke sensor according to claim 1, characterized in that: The time relationship is a time ratio between the first expected oscillation time and the first actual oscillation time.

12. An optical sensing system, characterized in that: include: Optical sensor for sensing optical data, including: A first oscillator, used to generate a first oscillation signal with a first oscillation frequency; as well as a second oscillator for generating a second oscillation signal having a second oscillation frequency, the second oscillation frequency being different from the first oscillation frequency, the optical sensor calculating the exposure time according to one of the first oscillation signal and the second oscillation signal, and calculating the frame time interval according to the other of the first oscillation signal and the second oscillation signal; and The first processing circuit is used to generate a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, and is used to receive the first oscillation signal and then obtain a first actual oscillation time when the first oscillator actually oscillates in response to the first instruction, wherein the first processing circuit further calculates the time relationship between the first expected oscillation time and the first actual oscillation time, and generates a second instruction according to the time relationship to instruct the second oscillator to oscillate for a second expected oscillation time.

13. The optical sensing system according to claim 12, wherein: Before obtaining the time relationship, the first processing circuit further generates a third instruction to instruct the second oscillator to oscillate for a third expected oscillation time; The first processing circuit generates the second instruction according to the time relationship to instruct the second oscillator to oscillate the second expected oscillation time, so that the second actual oscillation time actually oscillated by the second oscillator in response to the second instruction is the same as the third expected oscillation time.

14. The optical sensing system according to claim 12, wherein: The first oscillation frequency is higher than the second oscillation frequency.

15. The optical sensing system according to claim 14, wherein: The optical sensor calculates an exposure time according to the first oscillation signal, and calculates a frame time interval according to the second oscillation signal.

16. The optical sensing system according to claim 12, wherein: The first oscillation frequency is lower than the second oscillation frequency.

17. The optical sensing system according to claim 16, wherein: The optical sensor calculates a frame time interval according to the first oscillation signal, and calculates an exposure time according to the second oscillation signal.

18. The optical sensing system according to claim 12, wherein: The first processing circuit further generates a fourth instruction according to the time relationship to instruct the first oscillator to oscillate for a fourth expected oscillation time, so that a third actual oscillation time actually oscillated by the first oscillator in response to the second instruction is the same as the first expected oscillation time.

19. The optical sensing system according to claim 12, wherein: The time relationship is a time ratio between the first expected oscillation time and the first actual oscillation time.

20. A smoke sensor, characterized in that: include: A light source, for generating light; An optical sensor, for sensing optical data generated according to the light, comprising: A first oscillator, used to generate a first oscillation signal with a first oscillation frequency; a first processing circuit, for generating a first instruction to instruct the first oscillator to oscillate for a first expected oscillation time, and for receiving the first oscillation signal and then obtaining a first actual oscillation time when the first oscillator actually oscillates in response to the first instruction, wherein the first processing circuit further calculates a time relationship between the first expected oscillation time and the first actual oscillation time; and The second processing circuit is used to control the smoke sensor to generate a first alarm according to the time relationship.

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