diff --git a/content/zettels/feedforward_control.md b/content/zettels/feedforward_control.md
index 5dfa769..d3f828a 100644
--- a/content/zettels/feedforward_control.md
+++ b/content/zettels/feedforward_control.md
@@ -20,7 +20,7 @@ Depending on the physical system to be controlled, several feedforward controlle
 
 Second order trajectory planning: the acceleration and velocity can be bound to wanted values.
 
-Such trajectory is shown in [1](#figure--fig:feedforward-second-order-trajectory).
+Such trajectory is shown in [Figure 1](#figure--fig:feedforward-second-order-trajectory).
 
 <a id="figure--fig:feedforward-second-order-trajectory"></a>
 
@@ -38,7 +38,7 @@ F\_{ff} = m a + c v
 
 <span class="org-target" id="org-target--sec-fourth-order-feedforward"></span>
 
-The main advantage of "fourth order feedforward" is that it takes into account the flexibility in the system (one resonance between the actuation point and the measurement point, see [2](#figure--fig:feedforward-double-mass-system)).
+The main advantage of "fourth order feedforward" is that it takes into account the flexibility in the system (one resonance between the actuation point and the measurement point, see [Figure 2](#figure--fig:feedforward-double-mass-system)).
 This can lead to better results than second order trajectory planning as demonstrated [here](https://www.20sim.com/control-engineering/snap-feedforward/).
 
 <a id="figure--fig:feedforward-double-mass-system"></a>
@@ -76,7 +76,7 @@ q\_3 &= (m\_1 + m\_2)c + k\_1 k\_2 + (k\_1 + k\_2) k\_{12} \\\\
 q\_4 &= (k\_1 + k\_2) c
 \end{align}
 
-This means that if a fourth-order trajectory for \\(x\_2\\) is used, the feedforward architecture shown in [3](#figure--fig:feedforward-fourth-order-feedforward-architecture) can be used:
+This means that if a fourth-order trajectory for \\(x\_2\\) is used, the feedforward architecture shown in [Figure 3](#figure--fig:feedforward-fourth-order-feedforward-architecture) can be used:
 
 \begin{equation}
 F\_{f2} = \frac{1}{k\_12 s + c} (q\_1 d + q\_2 j + q\_3 q + q\_4 v)
@@ -103,7 +103,7 @@ q\_4 &= c\_1 k
 
 and \\(s\\) the snap, \\(j\\) the jerk, \\(a\\) the acceleration and \\(v\\) the velocity.
 
-The same architecture shown in [3](#figure--fig:feedforward-fourth-order-feedforward-architecture) can be used.
+The same architecture shown in [Figure 3](#figure--fig:feedforward-fourth-order-feedforward-architecture) can be used.
 
 In order to implement a fourth order trajectory, look at [this](https://www.mathworks.com/matlabcentral/fileexchange/16352-advanced-setpoints-for-motion-systems) nice implementation in Simulink of fourth-order trajectory planning (see also (<a href="#citeproc_bib_item_1">Lambrechts, Boerlage, and Steinbuch 2004</a>)).
 
diff --git a/content/zettels/temperature_control.md b/content/zettels/temperature_control.md
index b282e2c..46f79ae 100644
--- a/content/zettels/temperature_control.md
+++ b/content/zettels/temperature_control.md
@@ -11,6 +11,8 @@ Tags
 ## Commercial Temperature Controllers {#commercial-temperature-controllers}
 
 -   <https://www.thinksrs.com/products/tempcontrol.html>
+-   <https://www.thorlabs.com/thorproduct.cfm?partnumber=TC300B>
+-   <https://www.vescent.com/manuals/doku.php?id=slice:qt>
 
 
 ## Bibliography {#bibliography}
diff --git a/content/zettels/temperature_sensors.md b/content/zettels/temperature_sensors.md
new file mode 100644
index 0000000..0b59240
--- /dev/null
+++ b/content/zettels/temperature_sensors.md
@@ -0,0 +1,55 @@
++++
+title = "Temperature Sensors"
+author = ["Dehaeze Thomas"]
+draft = false
++++
+
+Tags
+:
+
+
+## Temperature sensors types {#temperature-sensors-types}
+
+There are three main types of temperature sensors:
+
+-   [RTD](#org-target--sec-temperature-sensor-rtd) (Resistance Temperature Detectors): made of pure metals (Pt, Ni or Cu)
+    They are all PTC (Positive Temperature Coefficient): PT100, PT1000, ...
+-   [Thermistor](#org-target--sec-temperature-sensor-thermistor): made of metal oxide mixtures (semiconductor materials).
+    It can have a NTC (Negative Temperature Coefficient) or a PTC (Positive Temperature Coefficient).
+-   [Thermocouple](#org-target--sec-temperature-sensor-thermocouple) (Seebeck effect):
+    -   Type K (-180 to 1200 degC)
+    -   Type T (-250 to 350 degC)
+
+
+### RTD {#rtd}
+
+<span class="org-target" id="org-target--sec-temperature-sensor-rtd"></span>
+
+
+### Thermistor {#thermistor}
+
+<span class="org-target" id="org-target--sec-temperature-sensor-thermistor"></span>
+
+
+### Thermocouple {#thermocouple}
+
+<span class="org-target" id="org-target--sec-temperature-sensor-thermocouple"></span>
+
+
+### Comparison of sensor types {#comparison-of-sensor-types}
+
+<https://www.ni.com/fr/shop/data-acquisition/sensor-fundamentals/measuring-temperature-with-thermocouples-rtds-and-thermistors.html?srsltid=AfmBOoqrR2VCWVvkCTjzTIYHlyiKVpt6Ket1xfhU1yFPTtXsGKg0RILE>
+
+|               | RTD | Thermistor | Thermocouple |
+|---------------|-----|------------|--------------|
+| Accuracy      |     |            |              |
+| Stability     |     |            |              |
+| Sensitivity   |     |            |              |
+| Response time |     |            |              |
+| Self heating  |     |            |              |
+
+
+## Bibliography {#bibliography}
+
+<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
+</div>