Patent Application
20190041271
The present disclosure relates generally to a method and system for the wireless interrogation of the state of a body immersed in a circulatory bath or tank for heating and/or cooling. More specifically, the present disclosure is directed towards a sensing probe having multiple thermal sensors for data enabling the determination of the core and surface temperatures associated with the immersed body in combination with one or more wireless connections leading to a controller (on a laboratory or kitchen thermal circulator device or via some intermediary means, itself connected to said controller) such that the user or the algorithm embedded within the controller can determine temperature information (e.g., core temperature) of the body being immersed and, optionally act upon this ‘closed-loop’ information.
Conventional thermometers (e.g., meat thermometers) have been used to help provide enhanced information in order for users to be enabled to obtain more consistent results for cooking and laboratory applications. The use of a meat thermometer, for example, can provide a visual indication on whether the meat is still undercooked or if the meat is in danger of being overcooked. However, these conventional types of food thermometers provide a passive indication of temperature and generally rely on the cook to remember to check the temperature and to act upon this additional information. This creates problems insofar as cook or laboratory personnel may lack the requisite experience, discipline, be distracted or the sample or food being processed may be unfamiliar, or the style of food preparation may be new to the cook. In particular, such a conventional thermometer may prove unusable for certain cooking or laboratory environments, such as sous vide style cooking and similar heated baths for laboratory environments where the food or materials are not accessible to a piercing-type probe because using one to materials contained in a bag would pierce the bag and elevate pathogen risk to the food.
More recently, wireless food thermometers have been introduced to provide a more convenient display of the temperature. However, such wireless food thermometers generally provide only a passive display of the temperature and may not provide sufficiently accurate or detailed information during cooking, such as a completion time, when to adjust a temperature, when to start or finish a particular cooking stage such as searing, or how long to let the food rest after removing it from heat. Also, such wireless food thermometers do not provide machine-readable versions of this information such that a controller associated with applying heat to the bath could use to “steer” the cooking. In addition, such wireless food thermometers have a limited range for transmitting information, especially in light of the challenges to conserve space, provide a waterproof enclosure, and withstand elevated cooking or process temperatures. Moreover, such products may have limited transmitting capability due to the composition of the cookware or lab hardware being used. Moreover, such approaches may require an “on board” power source, such as a battery, to enable such wireless communication. Such an approach is undesirable and even dangerous for a food application such as sous vide, and may prove infeasible for a body (whether a lab sample or food source) that must be refrigerated prior to being placed in a heated bath.
To date, Applicant believes that there are no thermometer, communication and interrogation systems which provide a battery-free wireless system for readily measuring temperature and deriving cook or heating time information to a machine intelligence contained in a circulator, to the cook or for a laboratory technician to control an experiment or process variable.
What is needed is a wireless thermometer and interrogator system for using with a sample or foodstuff in a circulating water bath with a reliable antenna or other wireless data transmitting and receiving device and a transmitter for querying and a receiver for receiving a variety of temperature data and providing an accurate summary of processed temperature information (e.g., core temperature, remaining cook time) therefrom.
The following terms are used in the claims of the patent as filed and are intended to have their broadest plain and ordinary meaning consistent with the requirements of the law:
A very low frequency signal is a radio signal having a frequency below 1 MHz and preferably on the order of less than 500 KHz, in the event of a non-conductive pot or bath container, and preferably on the order of 500 KHz-1 MHz in the event of a conductive pot or bath container.
A very high frequency (GHz-THz) signal are electromagnetic signals in the infrared or visible light spectrum, in the case of infrared this signal can occupy frequencies from 300 GHz to 430 THz and in the case of visible light, this signal can occupy frequencies from 430-790 THz. The equivalent structure to an RF Antenna in these frequency regimes for transmitting a signal is a photo emitter, such as an LED and for receiving a signal is a photo detector, such as a solar cell or PIN diode, etc.
A light transmitter is an infrared or visible light transmitter (such as a LED with suitable emission characteristics)
A light harvester is a solar cell or phototransistor or PIN photodiode with appropriate sensitivity characteristics
A probe array is a structure for placing in a body that includes multiple temperature sensors and a transmitter or an antenna.
A body is the protein or sample being measured by a probe and is placed in a container for immersion in a bath.
Where alternative meanings are possible, the broadest meaning is intended. All words used in the claims set forth below are intended to be used in the normal, customary usage of grammar and the English language.
The present invention relates to one or more of the following features, elements or combinations thereof.
The Applicants have invented a probe assembly for providing body temperature data for a body immersed in a bath (either in a laboratory setting or kitchen, such as sous vide) to a remote interrogator outside of the bath. The probe most preferably includes a rigid member (for ease of insertion), though variants of the present invention may incorporate non- and semi-rigid members also (e.g., reminiscent in rigidity of a coffee stirrer or soda straw).
The probe array includes a first end and a second end, and a shaft extending between the two ends. The first end of the probe is inserted into a body (whether a protein for cooking purposes or a laboratory sample) and the second end of the probe includes for low frequency RF signals an antenna and transmitter and receiver (or for very high, THz signals, an emitter and detector) and an electronic chip. The probe further includes multiple temperature sensors disposed along the length of the shaft, with at least one near the first end and one at the most distal end. The on-board controller IC receives temperature data from the sensors and stores the temperature data to provide to the antenna in response to interrogation from an interrogating signal.
In a light powered embodiment, the probe array includes a capacitor and a light energy harvester (photodetector) electrically for receiving light energy from a remote light source (whether solar powered or via another light source) to power the transmitter and chip and to an infrared or visible light transmitter (photoemitter) for sending temperature data back to the interrogating device. In this light enabled embodiment, a transmitter sends a very high frequency electromagnetic (infrared or visible light) signal from one or more probes to an interrogating transponder. The light enabled transponder or circulator requires a physical “window” embedded in its housing that is transparent to electromagnetic energy in the infrared or visible wavelength ranges, and this window can be embedded in the circulator, heated bath, the temperature controlled bath or an attachment. The transponder further optionally includes an LED whose light energy can be harvested by the probes working with the transponder. The signal from the probe(s) is transmitted preferably through a infrared transmitter (emitter, such as an IR LED), preferably by means of a modulated signal using a carrier frequency, similar to a television remote control (though a visible light wavelength may be used as well). The signal can also be sent using infrared with a serial protocol similar to IRDA. In this embodiment, power can also be harvested by the probe from ordinary ambient illumination.
In an alternative, RFID embodiment, the very low frequency antenna on the probe bi-directionally communicates with and receives power transmitted from one or more interrogator antennas. In this alternative embodiment, the chip receives power via the carrier envelope associated with the interrogation signal, so as to avoid the need for a battery that would otherwise be required to power the circuit, though the probe may also include a capacitor for storing energy received from the interrogating signal. This interrogator antenna or antennas can be integral to or added to the body of the bath (e.g., one or more surfaces of a pot, sous vide cooker or laboratory beaker or the like). The interrogator antenna(s) comprises one or more conductive loops surrounding the bath so as to ensure uninterrupted interrogation of the probe. The interrogator antenna further connects—either wirelessly via relay coils or via a “hard” electrical connection—to an interrogator that takes the multiple temperature sensor readings and interprets their values to determine: 1) what the core temperature is; and 2) what the remaining time is for cooking or remaining in the bath.
Thus, it can be seen that one object of the disclosed invention is to provide a probe and interrogatory system that wirelessly provides a substantially continuous temperature analysis for a sous vide cooker.
A further object of the present invention is to provide a probe and interrogatory system that wirelessly provides a substantially continuous temperature analysis for laboratory samples in a liquid circulator, heated bath, or temperature controlled bath.
Still another object of the present invention is to provide a probe and interrogatory system that can be used to accurately determine core temperature of a body without concern for a precise probe placement.
Yet another object of the present invention is to provide a probe and interrogatory system that can be used wirelessly in an elevated temperature liquid bath environment.
Still another object of the present invention is to provide a probe and interrogatory system that can be used wirelessly without an on-board battery power source.
Another object of the present invention is to provide a probe and interrogatory system that can be retrofitted to existing cookware and/or laboratory equipment.
Yet another object of the present invention is to reduce a chef's workload from having to determine a protein type, thickness, starting temperature, shape, to merely requiring the chef know the type of protein involved.
It should be noted that not every embodiment of the claimed invention will accomplish each of the objects of the invention set forth above. For instance, certain claimed embodiments of the invention may focus solely upon cooking functions. In addition, further objects of the invention will become apparent based upon the summary of the invention, the detailed description of preferred embodiments, and as illustrated in the accompanying drawings. Such objects, features, and advantages of the present invention will become more apparent in light of the following detailed description of various preferred embodiments thereof, and as illustrated in the accompanying drawings.
As can be seen in
In its radio frequency driven embodiments, the tank 20 is preferably a non-conductive material so as to eliminate any type of “Faraday cage” effect, though this can be offset, among other means, by changing the frequency of the radio communication used with the probe 30 or by judicial placement of the interrogating antenna to be within the bounds of the “Faraday cage”. That is, applicant believes that the use of a non-conductive tank permits a much lower frequency (e.g., around 300-400 KHz, such as very low frequency RFID signals) for communicating effectively with the probe, while the use of a conductive tank would require a higher frequency range (e.g., 500 KHz to 1 MHz), while still staying below higher frequency signals that would not work sufficiently in water to interrogate the probe 20.
In this embodiment, the tank 20 includes a bottom 22 and sides 24, each of which has located thereon adhesives 26 with antenna loops 28 located thereon so as to provide antennas in defining a multiplicity of planes so as to ensure proper communication with the probe 30. Alternatively, such antenna loops could be painted on, etched on, affixed decal or applique-like, or molded to the tank. As a further alternative, the tank 20 could include a lid (not shown) with an additional antenna loop.
The probe 30 is comprised of a first end 32 or tip and a second end 34 or head. The second end 34 has an antenna 35 and a chip or microcontroller 36 located thereon for communication with and receiving power supply from the antenna loops 28. The probe also contains multiple sensors 38 which are linearly displaced along the length or axis of the shaft 39. The probe thus enables readings of different points inside the protein or body upon insertion. As shown in
As show in
Some of the advantages and uses of the probe is shown in
The present invention can, therefore, enable virtually automated cooking, avoiding the requirement for the cook to enter the type and shape of protein, the thickness, done-ness temperature, etc. with the only user input settings being: a) identification of foodstuff (i.e.: steak, chicken, carrots, etc.) and b) time past Pasteurization (otherwise known as “tenderness time”) because as a rule of thumb: connective tissues break-down during prolonged low-temperature cooking times and given sufficient cooking time: even the toughest proteins can become tender.
The circulator 40 is of any standard type of circulator, heated bath, or temperature controlled bath known to be used in laboratory or cooking equipment, and is further electrically connected to a controller 50 or interrogator for taking the data from the probe to provide to a user. The interrogator 50 includes a microcontroller which (in the radio frequency embodiments) scans a band of frequencies (e.g., from about 300-400 kHz) and then calibrates itself to the resonance of the interrogated probe, thus making the system auto-calibrating vis-a-vis “best” frequency. In this embodiment, the circulator 40 further includes a multi loop metallic relay coil 42 disposed therein, wherein the coil 42 is in close proximity and communicates wirelessly with a reciprocal relay coil antenna 44 on adhesive 26. This coil may be coupled with the coil of the circulator 40. Thus, the circulator generates a very low frequency RFID signal that both powers the probe and receives data from the probe. It should also be understood, however, that the circulator, in alternative embodiments, may be physically connected to the relay coil antenna 44 for providing only a single wireless connection to the probe 30.
In still further variants of the present invention such as shown in
In yet another embodiment of the present invention as shown in
In this embodiment, the probe 330 is preferably comprised of a transmitter 336 which is preferably a visible light or infrared light transmitter which sends very high frequency light signals (>700 THz) to a transponder 352 such as a photo transistor/photo detector on the interrogator 350. As with the RFID embodiment, this embodiment of the probe 330 involves a first end 332 or tip and a second end 334 or head and a number of sensors 337 on the axis defined therebetween. The probe 330 is in a sealed pouch and the first end 332 is inserted in a foodstuff or protein such that only the second end 334 is exposed from the body of the protein but still within the confines of the sealed pouch. The second end 334 has an energy harvester 335 such as a solar cell, panel or PIN Photodiodes and a chip or microcontroller 338 attached thereto for communication with and receiving power supply from the either ambient light and/or a interrogator window 354 containing a light source (such a LED light) as well as the photo detector or transponder 352 on the interrogator 350. Energy received from the harvester 335 may be stored in a capacitor (not shown) in order to maintain the operation of the chip 338 The transponder 352 receives temperature related data from the chip 338 via the transmitter 336 which is sent preferably through a infrared signal, most preferably through a modulated IR signal using a carrier frequency, similar to a television remote control (though a visible light wavelength may be used as well). The signal can also be sent using infrared with a serial protocol similar to IRDA so as to avoid unwanted interference from other sources. Once in an interrogator 350, the temperature data may be processed in essentially the same fashion as described with other embodiments above for processing in the control head 356 and providing information to the user via the user interface 358.
While the disclosure is susceptible to various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and have herein been described in detail. It should be understood, for example, that the number and specific locations of the sensors may vary depending upon cost considerations. Likewise, it may be desirable to port some of the data processing from the interrogator 50 to the microcontroller 36 on the probe. In addition, while the interrogator is preferably not located in the bath of the tank 20, there is no requirement that the user interface has to be connected to the circulator—rather, such information could be ported to a remote computer or device (such as a phone application). There is no intent to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure as defined by the appended claims.
